Difference between revisions of "A20-OLinuXino-MICRO"

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== Official Images from OLIMEX ==
+
== Official Images Released and Recommended by Olimex ==
  
Note that only the microSD connector is suitable for booting the desired operating system, the SD-MMC connector is not suitable for booting since it is not a part of the boot sequence (refer to A20 datasheet).
+
Below you would find links to the official Debian and Android images. The images in this chapter were compiled by Olimex. They are recommended for beginners and first time users since they include full hardware support.  
  
=== Linux ===
+
If you are an experienced embedded Linux professional you might also find build instructions to our images.
  
The official Debian images are suitable only for microSD card. Information on booting Debian from the NAND might be found at the forum.
+
=== Linux Images ===
  
Download methods and locations might be found below!
+
There are three different types of Olimex-made official Linux images:
  
Torrent of Debian release 8: [[Media:A20_OLinuxino_Micro_debian_34_90_release_8.torrent|A20-OLinuXino-MICRO Debian with kernel 3.4.90+ release 8]]
+
* Recent kernel and u-boot Armbian-based Ubuntu Bionic and Debian Buster Linux images for general purpose Linux experience
 +
* KODI images, LibreElec-based, if you wish to use your A20 board as TV box
 +
* Debian 8 Jessie images with v3.4.x sunxi kernel
  
Direct download of Debian release 7: [https://drive.google.com/file/d/0B-bAEPML8fwlX2tYS2FmNXV5OUU/edit?usp=sharing A20-OLinuXino-MICRO Debian with kernel 3.4.67+ release 7]
 
  
*Default Login: '''root/olimex'''
+
The official Linux images should be downloaded to a microSD card. Images can be downloaded either from our FTP or via torrent client. You can install the Debian to the NAND or the eMMC of your board (if it comes with one). Information on booting Debian from the NAND or eMMC might be found in these wiki article: [[how to install Debian to NAND]]; [[how to install Debian to eMMC]]. Download locations for the official images might be found below:
*Linux Kernel 3.4.90+
+
 
*LXDE desktop environment
+
== Download locations Linux images ==
*Mplayer CLI
+
 
*smplayer
+
'''ALWAYS FIRST TEST WITH LATEST OFFICIAL IMAGE, NEWER HARDWARE REVISIONS OF THE BOARD MIGHT NOT WORK WITH OLDER IMAGES!!!'''
*Midori browser
+
 
*GCC 4.6
+
----
*GPIO support
+
 
*i2c-tools
+
Main FTP hub folder for all Olimex-made A20 official images:
*dpkg
+
 
*git
+
ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/
*perl
+
 
*xorg
+
'''Latest mainline kernel official images:'''
*Python 2.7
+
 
*OpenCV
+
1. Latest Ubuntu Desktop Linux images can be found here: [ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/1.latest_mainline_images/bionic/images/ FTP directory with latest Ubuntu Bionic images]
*Scratch
+
 
*vlc
+
2. Latest Debian Server Linux images can be found here:
*minicom
+
[ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/1.latest_mainline_images/buster/images/ FTP directory with latest Debian Buster images]
*HDMI
+
 
*Micro SD card
+
'''Latest KODI player official images:'''
*SD/MMC card
+
 
*OTG USB
+
3. Latest KODI player LibreElec Linux images here:
*HIGH SPEED HOST1 USB
+
[ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/4.LibreELEC_KODI_images/ FTP directory with latest KODI/LibreElec images]
*HIGH SPEED HOST2 USB
+
 
*ETHERNET 100MBIT
+
'''Latest sunxi kernel official images (not recommended):'''
*SATA
+
 
*Audio IN
+
Latest sunxi-kernel (v3.4.x) Debian 8 Jessie Linux images here: [ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/2.legacy_images_kernel_3.4.x/ FTP location with all sunxi-kernel Debian 8 images here]
*Audio OUT
+
 
*Kernel support for USB-ETHERNET-AX88772B 
+
FTP link of official Debian Jessie release #18, suitable for boards with no extra flash memory or with extra eMMC flash memory (not suitable for boards with NAND memory): [https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-MICRO/Debian/sd/A20_OLinuxino_Micro_debian_Jessie_34_103_2G_eMMC_release_18.zip A20 OLinuxino Micro debian Jessie 34 103 2G eMMC release 18]
*Kernel suppot for MOD-WIFI-RTL8188
 
*Support for Olimex-made displays and touchscreens: A13-LCD43TS 4.3″ LCD with backlight and touchscreen 480×272 pixels; A13-LCD7TS 7″ LCD with backlight and touchscreen 800×480 pixels; A10-LCD10TS 10.1″ LCD with backlight and touchscreen 1024×600 pixels;
 
  
 +
FTP link of official Debian Jessie release #15, suitable for boards with no extra flash memory or with extra NAND memory (not suitable for boards with eMMC memory): [https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-MICRO/Debian/sd/A20_OLinuxino_Micro_debian_Jessie_34_103_2G_NAND_release_15.7z A20-OLinuXino-MICRO Debian Jessie with kernel 3.4.103+ release 15]
  
 +
Image description and typical interfacing: [https://raw.githubusercontent.com/OLIMEX/OLINUXINO/master/SOFTWARE/A20/A20-build-3.4.103-release-7/USAGE-AND-COMMON-PRACTICEs-A20-Olimex_kernel_3.4.103%2B_Jessie_rel_3.txt description and basic usage of different peripherals at at the GitHub page]
  
Tested board peripherals with this image:
+
Image build instructions and required files for latest Debian Jessie release might be found here: [https://github.com/OLIMEX/OLINUXINO/raw/master/SOFTWARE/A20/A20-build-3.4.103-release-7/BUILD_DESCRIPTION_A20_Olimex_kernel_3.4.103%2B_Jessie_rel_6.txt build instructions and required files at the GitHub page]
*GPIO - located at /sys/class/gpio
 
*LCD - supported LCD displays and touchscreens are the Olimex-made ones [https://www.olimex.com/Products/OLinuXino/A13/A13-LCD43TS A13-LCD4.3TS], [https://www.olimex.com/Products/OLinuXino/A13/A13-LCD7-TS A13-LCD7TS], [https://www.olimex.com/Products/OLinuXino/A13/A13-LCD10TS A13-LCD10TS]
 
*Touch screen - you need calibrate LCD before using touch screen. Type: ts_calibrate and then test it with ts_test
 
*SATA - works including power on/off control
 
*HDMI - the default HDMI resolution is 720p60(1280x720-60 Hz)
 
*ASIX 8877 USB-LAN - [https://www.olimex.com/Products/OLinuXino/A13/USB-ETHERNET-AX88772B/ USB-ETHERNET-AX88772B]
 
*WEB camera A4TECH
 
*TL-WN721(TP-LINK USB wireless)
 
*RTL8188CU - [https://www.olimex.com/Products/Modules/Ethernet/MOD-WIFI-RTL8188/ MOD-WIFI-RTL8188] - instructions on configuration might be found here [[How_to_configure_MOD-RTL8188_on_official_OLinuXino_Debian_releases]]
 
*USB_OTG - works as OTG device and Low/Full/High USB host
 
*USB_HOST_up - works as Low/Full/High USB host
 
*USB_HOST_down - works as Low/Full/High USB host
 
*mico_SD_card - allow Linux boot
 
*secondary SD-MMC card - with card present detector
 
*ETHERNET - 100Mb
 
*Headphone OUT - audio output
 
*MIC IN - microphone input
 
*I2C2(100KHz) - /dev/i2c-2
 
*I2C1(100KHz) - /dev/i2c-1
 
*UART6 - /dev/ttyS1
 
*UART7 - /dev/ttyS2
 
  
 +
You can find some older releases and older build instructions (older image revisions might be used as a reference, for testing purposes, or if you own old hardware revision of the board) at the following article: [[A20-OLinuXino-MICRO-older-releases|older releases and older build instructions]]
  
Note: the A20-Debian-SD card which we have in our web store contains the same image on 4GB Class10 fast micro SDcard, if you want to use this image please use card of Class10 speed or the performance of Linux will be very slow.
+
----
  
Note: in the previous Debian releases the Ethernet was auto-detected and initialized during boot BUT this was causing big delays in the start-up of the board if you didn't want to use Ethernet or if there wasn't Ethernet cable connected.
+
Note: in the previous Debian releases the Ethernet was auto-detected and initialized during boot BUT this caused big delays in the start-up of the board if you didn't want to use Ethernet or if there wasn't Ethernet cable connected.
 
   
 
   
 
You can enable it by following these two steps:
 
You can enable it by following these two steps:
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This should enable the Ethernet and then SSH would also be available.
 
This should enable the Ethernet and then SSH would also be available.
  
=== Android ===
+
=== Android images ===
  
Torrents of official Android releases are below. Please read description of the image carefully.
+
FTP links of official Android releases are below. Please read description of the image carefully.
  
Torrent of Android release 3 for NAND memory with HDMI and 7 inch LCD (800x480) support: [[Media:A20_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_800x480_release_3.torrent‎‎|A20-OLinuXino Android for NAND with HDMI and 800x480 video support]]
+
FTP link of Android release 3 for NAND memory with HDMI and 7 inch LCD (800x480) support: [https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-MICRO/Android/nand/A20_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_800x480_release_3.img A20-OLinuXino Android for NAND with HDMI and 800x480 video support]
  
Torrent of Android release 3 for NAND memory with HDMI and 10 inch LCD (1024x600) support: [[Media:A20_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_1024x600_release_3.torrent|A20-OLinuXino Android for NAND with HDMI and 1024x600 video support]]
+
If you want to use it with our RTL8188ETV module then consider release #4:
 +
 
 +
[https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-MICRO/Android/nand/A20_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_800x480_release_4.img A20-OLinuXino-MICRO Android for NAND memory with video settings for 800x480 display output + MOD-WIFI-RTL8188ETV module]]
 +
 
 +
FTP of Android release 3 for NAND memory with HDMI and 10 inch LCD (1024x600) support: [https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-MICRO/Android/nand/A20_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_1024x600_release_3.img A20-OLinuXino Android for NAND with HDMI and 1024x600 video support]
  
 
Torrent of Android release 1 for microSD card with HDMI and 7 inch LCD (800x480) support: [[Media:A20_SD_4G_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_800x480_release_1.torrent‎‎‎|A20-OLinuXino Android for microSD card with HDMI and 800x480 video support]]
 
Torrent of Android release 1 for microSD card with HDMI and 7 inch LCD (800x480) support: [[Media:A20_SD_4G_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_800x480_release_1.torrent‎‎‎|A20-OLinuXino Android for microSD card with HDMI and 800x480 video support]]
  
Torrent of Android release 1 for microSD card with HDMI and 10 inch LCD (1024x600) support: [[Media:A20_SD_4G_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_1024x600_release_1.torrent‎‎|A20-OLinuXino Android for microSD card with HDMI and 1024x600 video support]]
+
Torrent of Android release 1 for microSD card with HDMI and 10 inch LCD (1024x600) support: [[Media:A20_SD_4G_android_422_TS_USB_UART_I2C_WIFI_LAN_HDMI_LCD_1024x600_release_1_fix.torrent‎‎|A20-OLinuXino Android for microSD card with HDMI and 1024x600 video support]]
  
Direct download of Android 4.2.2 NAND image made with A20-SDK2.0 for [https://docs.google.com/file/d/0B-bAEPML8fwlUjRLUmRydENZMXc/edit?usp=sharing A13-LCD7"TS] and [https://docs.google.com/file/d/0B-bAEPML8fwlbm96LVJNWnVQaFE/edit?usp=sharing A13-LCD10"TS]
+
Build instructions and source files for the official Android images for A20 boards in this repository: https://github.com/hehopmajieh/olinuxino_configs
  
Direct download of Android 4.2.2 SD-card image made with A20-SDK2.0 for [https://docs.google.com/file/d/0B-bAEPML8fwlUFd5OHVOaFJIRmc/edit?usp=sharing A13-LCD7"TS] and [https://docs.google.com/file/d/0B-bAEPML8fwlc1F6TkNIcmlWcjQ/edit?usp=sharing A13-LCD10"TS]
+
The Android image has the following features:
 
 
The image is with these features:
 
 
*Android 4.2.2
 
*Android 4.2.2
 
*NAND image i.e. will work only on [https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO-4GB/ A20-OLinuXino-MICRO-4GB]
 
*NAND image i.e. will work only on [https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO-4GB/ A20-OLinuXino-MICRO-4GB]
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What left unsupported:
+
What is left unsupported in Android:
 
*SATA
 
*SATA
 
*SD-MMC card on bottom
 
*SD-MMC card on bottom
 +
 +
== Notable unofficial images ==
 +
 +
Below you would find locations to images released by the community. These are not officially supported by Olimex, however, some of these releases are pretty good and worth a try:
 +
 +
*A number of very good and optimized A20-OLinuXino-MICRO Armbian images: [https://www.armbian.com/olimex-micro/ link to LIME2 article at Armbian's web-site]
 +
 +
*A20-OLinuXino-MICRO is supported by openSUSE Factory, installation instructions might be found here: [https://en.opensuse.org/HCL:A20-OLinuXino-MICRO openSUSE wiki link]
 +
 +
*A20-OLinuXino-MICRO is recognized by the Devuan community and there are official releases here might be found here: [https://files.devuan.org/devuan_jessie_rc/embedded/ Devuan list of files link]
 +
<br>
  
 
== Documents ==
 
== Documents ==
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===A20-OLinuXino Board User Manual===
 
===A20-OLinuXino Board User Manual===
[https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO-4GB/resources/A20-OLinuXino-Micro.pdf A20-OLinuXino User Manual]
+
[https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO-4GB/resources/A20-OLinuXino-Micro.pdf A20-OLinuXino user manual]
  
 
=== A20 Brief ===
 
=== A20 Brief ===
  
[https://github.com/OLIMEX/OLINUXINO/blob/master/HARDWARE/A20-PDFs/A20%20brief%2020130407.pdf A20-Brief description]
+
[https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/A20-PDFs/A20%20brief%2020130407.pdf A20 brief description]
 
 
  
 
=== A20 Datasheet ===
 
=== A20 Datasheet ===
  
[https://github.com/OLIMEX/OLINUXINO/blob/master/HARDWARE/A20-PDFs/A20%20Datasheet%20v1.0%2020130227.pdf A20 datasheet]
+
[https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/A20-PDFs/A20%20Datasheet%20v1.0%2020130227.pdf A20 datasheet]
 
 
  
 
=== A20 User Manual ===
 
=== A20 User Manual ===
[https://github.com/OLIMEX/OLINUXINO/blob/master/HARDWARE/A20-PDFs/A20%20User%20Manual%202013-03-22.pdf A20 Users manual]
+
[https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/A20-PDFs/A20%20User%20Manual%202013-03-22.pdf A20 users manual]
  
 
== Hardware ==
 
== Hardware ==
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===Board dimensions===
 
===Board dimensions===
  
 +
A20-OLinuXino-MICRO hardware revision M dimensions in mils:[https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO/resources/A20-OLinuXino-MICRO-revsion-M-dimensions.png image in PNG format]
  
A20-OLinuXino-MICRO and A20-OLinuXino-MICRO-4GB basic dimensions in mils: [https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO/resources/a20-dimensions.png image in PNG format]
+
A20-OLinuXino-MICRO hardware revision D dimensions in mils: [https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO/resources/a20-dimensions.png image in PNG format]
  
 
===CAD files===
 
===CAD files===
  
  
A20-OLinuXino is Open Source Hardware, CAD files are available at [https://github.com/OLIMEX/OLINUXINO/tree/master/HARDWARE/A10-OLinuXino-MICRO GitHub]
+
A20-OLinuXino-MICRO is Open Source Hardware, CAD files are available at [https://github.com/OLIMEX/OLINUXINO/tree/master/HARDWARE/A20-OLinuXino-MICRO GitHub]
 
 
  
 
The CAD product used to design OLinuXino is Eagle and you can download evaluation free version from their [http://www.cadsoftusa.com/ web].
 
The CAD product used to design OLinuXino is Eagle and you can download evaluation free version from their [http://www.cadsoftusa.com/ web].
 
  
 
===Board Layout===
 
===Board Layout===
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===Linux Commands===
 
===Linux Commands===
 
  
 
[[Linux-Commands]] Brief Linux Command reference
 
[[Linux-Commands]] Brief Linux Command reference
 
  
 
===Python===
 
===Python===
  
  
[https://pypi.python.org/pypi/pyA20/0.1.3 pyA20 is Python library for access to A20-OLinuXino-MICRO GPIOs, I2C, SPI]
+
[https://pypi.python.org/pypi/pyA20 pyA20 is Python library for access to A20-OLinuXino-MICRO GPIOs, I2C, SPI]
  
 
Use:
 
Use:
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     GPIO.cleanup()
 
     GPIO.cleanup()
  
 +
===GPIO under Linux===
  
===GPIO under Linux===
+
A very good GPIO guide by Dr. Guido Pelz might be found here: [https://github.com/OLIMEX/OLINUXINO/raw/master/HARDWARE/A20-PDFs/A20-GPIO.pdf https://github.com/OLIMEX/OLINUXINO/raw/master/HARDWARE/A20-PDFs/A20-GPIO.pdf]
 +
 
 +
You can read data from a given GPIO port. The logical ranges are usually as follows: 0V-1V for LOW (or 0) and 2.4V-3.3V for HIGH (or 1). All voltages are measured against ground (GND).
  
A very good GPIO guide by Dr. Guido Pelz might be found here: http://www.py6zgp.com/download/A20-GPIO.pdf
+
If the input signal is to high, you will at least destroy the port!
  
 
In order to use A20 GPIO's first you have to export them. You can export a single GPIO:
 
In order to use A20 GPIO's first you have to export them. You can export a single GPIO:
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4. Unexport GPIO 49 when finished
 
4. Unexport GPIO 49 when finished
  
     echo 69 > /sys/class/gpio/unexport
+
     echo 49 > /sys/class/gpio/unexport
  
 
===Add Voice to your OLinuXino project===
 
===Add Voice to your OLinuXino project===
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===How to correctly power off OLinuXino running from NAND Flash===
 
===How to correctly power off OLinuXino running from NAND Flash===
 
[http://olimex.wordpress.com/2014/01/24/how-to-correctly-power-off-olinuxino-running-android/ In this Blog post] we explain what are the problems. This is common problem for all computers running OS. [http://www.linux-mtd.infradead.org/doc/ubifs.html#L_ubifs_mlc Here] you can read more about MLC NAND Flash and Linux file system.
 
[http://olimex.wordpress.com/2014/01/24/how-to-correctly-power-off-olinuxino-running-android/ In this Blog post] we explain what are the problems. This is common problem for all computers running OS. [http://www.linux-mtd.infradead.org/doc/ubifs.html#L_ubifs_mlc Here] you can read more about MLC NAND Flash and Linux file system.
 +
 +
=== Is it possible to boot Debian from NAND? Do you provide such image?===
 +
Yes, it is possible. Use the latest Debian Jessie image and write "nandinstall". More information can be found in this wiki article: [[How_to_install_Debian_to_NAND| installing Debian Jessie to the 4GB NAND memory]]
 +
 +
There are other people who are also successful in booting Debian from the NAND. Make sure to check on the forum. Make sure to check the number of very good and optimized A20-OLinuXino Debian images by Igor Pečovnik. There are also his instructions for NAND installation of Debian: [http://www.armbian.com/download/ link to his web-site]
  
 
===How to generate boot-able SD-card Debian Linux image for A20-OLinuXino? ===
 
===How to generate boot-able SD-card Debian Linux image for A20-OLinuXino? ===
  
[http://olimex.wordpress.com/2014/03/07/building-a20-olinuxino-micro-debian-image-with-hardware-accelerated-video/ Official Olimex wordpress article on how extend the previous build of Debian Linux 3.4 with hardware acceleration support, keep a look at the wordpress for more interesting articles]
+
Build instructions and required files for the latest Debian images: [https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A20/A20-build-3.4.103-release-7 instructions and files at the GitHub page]
 +
 
 +
[http://olimex.wordpress.com/2014/03/07/building-a20-olinuxino-micro-debian-image-with-hardware-accelerated-video/ Official Olimex wordpress article on how to extend the previous build of Debian Linux 3.4 with hardware acceleration support, keep a look at the wordpress for more interesting articles]
  
 
[https://github.com/linux-sunxi/u-boot-sunxi/wiki Sunxi u-boot loader] The linux-sunxi git page contains a lot of sources for all Olimex Allwinner boards.
 
[https://github.com/linux-sunxi/u-boot-sunxi/wiki Sunxi u-boot loader] The linux-sunxi git page contains a lot of sources for all Olimex Allwinner boards.
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To repair the image on the NAND re-upload it following these steps:
 
To repair the image on the NAND re-upload it following these steps:
  
*1. Install and run PhoenixSuit (can be found here: [https://docs.google.com/file/d/0B7WHuNCASY8caWRNUy00VUszbDg/edit?usp=sharing download from google drive]).
+
*1. Install and run PhoenixSuit (can be found here: [https://drive.google.com/file/d/0BwplT87k9SCgaTFTZnVST05ONzA/view?usp=sharing download from google drive]).
  
 
*2. Go to firmware tab of the program and point to a valid Android image (the latest official one may also be downloaded above).
 
*2. Go to firmware tab of the program and point to a valid Android image (the latest official one may also be downloaded above).
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===How do I write the official Android image to a micro SD card for my A20 board?===
 
===How do I write the official Android image to a micro SD card for my A20 board?===
There are two Android images available for an SD card. One for 7″ LCD and one for 10″ LCD [[A20-OLinuXino-MICRO#Android]]. Note that Android display configuration settings are edited in the script.bin file (it has to be converter to fex and edited according to the fex guide at linux sunxi's article; then converted back to script.bin and written in the image). To write the images on the SD card you will need PhoenixSuit and to follow these steps:
+
A: First download one of the official Android images, which might be found in the Android section above.
 +
 
 +
Make sure that the download link you visit clearly indicates that the image is suitable for the microSD card since there are images suitable for NAND memory also. The images suitable for the microSD memory and those suitable for NAND card are different. However, the upload method is almost identical – using PhoenixSuit.
 +
 
 +
There are two types of Android images for microSD card that we usually provide and each of them has to be downloaded to a microSD card using a different method. The image provided for microSD card is either the native Android image that can be downloaded to the card via a software tool like PhoenixSuit (through the board) or an image taken from an already prepared microSD card that requires to simply write the image (through a microSD card reader).  
 +
 
 +
'''It is more likely that you have an Android image that requires a simple copy to a card. If that is the case you can follow the exact steps as for Linux (e.g. using "Win32 Disk Imager" or "dd" command).'''
 +
 
 +
In order to prepare a microSD card with a native Android you will need a software tool called PhoenixSuit and then:
  
• Install and run PhoenixSuit
+
• Install and run PhoenixSuit (can be found here: [https://drive.google.com/file/d/0BwplT87k9SCgaTFTZnVST05ONzA/view?usp=sharing download from google drive])
  
 
• Go to the firmware tab of the program and point to a valid Android image (note that the  
 
• Go to the firmware tab of the program and point to a valid Android image (note that the  
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where X is the uSD card.
 
where X is the uSD card.
  
===How to change HDMI, VGA and LCD resolutions?===
+
===How to change HDMI, VGA and LCD resolutions in the official Debian image?===
 +
 
 +
The default SD card setup is made with settings for HDMI 720p/60Hz. If you want to change to some other LCD, VGA or HDMI resolution then you have to start change_display.sh script file in /root directory. When you are logged as super user in the board type:
  
 +
  For Debian Wheezy releases: ./change_display* (* = press 'tab')
 +
  For Debian Jessie releases: change_display* (* = press 'tab')
  
The default SD card setup is made with settings for HDMI 720p/60Hz. If you want to change to some other LCD, VGA or HDMI resolution then you have to start change_display.sh script file in /root directory.
+
and press "Enter".
  
Type:
+
'''Note that the script should be executed as super user. Under the command line interface you are automatically logged as super user (user "root", password "olimex"). However, under the graphical environment you are not auto-logged as super user and you must type "sudo" before the command (in the GUI the super-user is "olimex" and the password is "olimex")'''
    ./change_display*
 
or
 
    ./change_display_A20_OLinuXino.sh
 
and press "Enter"
 
  
 
Then choose the resolution and the interface(LCD, HDMI or VGA). Note that the selection of a specific resolution is done by navigating with the arrow keys and pressing "space" button. Make sure the asterisk marks your selection properly.  
 
Then choose the resolution and the interface(LCD, HDMI or VGA). Note that the selection of a specific resolution is done by navigating with the arrow keys and pressing "space" button. Make sure the asterisk marks your selection properly.  
Line 465: Line 472:
 
*9. 1080p50
 
*9. 1080p50
 
*10. 1080p60
 
*10. 1080p60
 
+
<br>
 
'''For VGA:''' (note that the VGA signals are routed to custom 6 pin connector and you need from adapter to standard VGA connector)
 
'''For VGA:''' (note that the VGA signals are routed to custom 6 pin connector and you need from adapter to standard VGA connector)
  
Line 481: Line 488:
 
===How to generate Arch Linux image?===
 
===How to generate Arch Linux image?===
  
[http://alarma20.wordpress.com/2013/09/13/howto-build-arch-linux-arm-for-a20-olinuxino-micro/ Step by step instructions how to build Arch Linux image]
+
Recent forum post by user progmetalbg here: [https://www.olimex.com/forum/index.php?topic=4261.0| at Olimex forums]
 +
 
 +
[http://alarma20.wordpress.com/2013/09/13/howto-build-arch-linux-arm-for-a20-olinuxino-micro/ Older step by step instructions on how to build Arch Linux image]
  
 
===How to detect and enable the Ethernet controller (if it is disabled by default)? ===
 
===How to detect and enable the Ethernet controller (if it is disabled by default)? ===
Line 530: Line 539:
 
     make -j4
 
     make -j4
  
Dave from Axon instruments wrote more detailed [http://axonjakarta.wordpress.com/2014/02/14/olimex-a20-android-building-4/ blog post] about how he generates the Android image]
+
Dave from Axon instruments wrote more detailed [http://axonjakarta.wordpress.com/2014/02/14/olimex-a20-android-building-4/ blog post] about how he generates the Android image
  
===How to edit board configurations and definitions in the official Debian Linux? ===
+
===I don't have neither serial cable, nor HDMI monitor. I also can't access the local Ethernet network. Can I somehow access the board anyway?===
  
The biggest part of the board configuration might be edited, changed or improved in a file called script.bin
+
The latest official Debian Linux image allows the use the USB_OTG connector for SSH connection without the need of a LAN cable or a serial cable. You can use a mini USB cable connected between your host PC and the on-board mini USB connector. For connection convenience there is a DHCP server running specifically for USB0 interface. The DHCP server should give IP address to the new USB0 interface of your host PC so you can make SSH connection from your PC to the default board IP address of the USB0 interface – 192.168.2.1.
  
The script.bin file can usually be found in the main directory of a microSD card prepared with official Debian image. The folder containing the script can be inspected under both Windows, Linux or Mac.
+
You can connect to the board using a mini USB cable and an SSH client (if you use Windows you might use "puTTY", for example) at address 192.168.2.1.
  
You can't directly edit binary file so you would need to convert it to text format (it is called fex in this case), then edit the parameters via a text editor and finally switch it back to binary format.
+
For Windows operating system - upon connection, the board should show up in "Windows Device Manager" as "RNDIS Ethernet Gadget". You might be asked to install a driver. The drivers can be found online as "RNDIS driver" (Remote Network Driver Interface Specification).  The drivers are provided by Microsoft and they should be available for every Windows distribution - refer to the respective files and articles provided by Microsoft on how to install the required drivers.
  
The different options for the script are explained here: [http://linux-sunxi.org/Fex_Guide SUNXI FEX GUIDE]
+
===How to edit board configurations and definitions in the official Debian Linux? ===
  
IMPORTANT! ADJUSTING SCRIPT.BIN WITH IMPROPER VALUES MIGHT BREAK YOUR DEBIAN IMAGE AND IT IS ALWAYS RECOMMENDED TO KEEP A BACK-UP OF YOUR DEFAULT SCRIPT.BIN
+
Do you want a custom video resolution output? Do you need a different port definition? Do you need to change the hardware defitions of the board?
  
To convert back and fort the script.bin you might use different tools. You can find Windows tools here: [https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/fex-bin-convertor-windows SUNXI TOOLS FOR WINDOWS] . For Linux convertors please check the sunxi tools here: [https://github.com/linux-sunxi/sunxi-tools SUNXI TOOLS]
+
You would need to edit the board's script.bin/script.fex file. How to do it is described in another separate article: [[How_to_edit_board_configurations_and_definitions_in_the_official_Debian_Linux]].
  
Note that it is possible to change the script.bin in a running Debian image in newest releases! More information might be found at the end of the document! Not all releases feature the live method of changing fex to bin so if you board doesn't have it follow the other methods.
+
===How to properly calibrate a display under Debian===
 
 
Changing script.bin file without removing the microSD card:
 
  
The tools for script.bin changing are located in /opt/sunxi-tools directory
+
Latest Debian Jessie images should be calibrated as detailed here: https://www.olimex.com/wiki/Touch_calibration_official_images
<nowiki># cd /opt/sunxi-tools</nowiki>
 
<nowiki># ./chscr.sh</nowiki>
 
This will convert script.bin file from sdcard to script.fex file and the file  will be opened using nano editor.
 
Now you can change the board modules and parameters, save the changes and exit from nano editor
 
<nowiki># ./wrscr.sh</nowiki>
 
this will convert script.fex to script.bin and the script.bin file will be written to sdcard.
 
  
 +
If using older Debian Wheezy image follow the algorithm below:
  
===How to properly calibrate a display under Debian===
+
Make sure you are properly logged in the LXDE visual interface! Else applying calibration would not happen for the current user - if you are calibrating from the X graphical interface make sure that you are logged as user “olimex” (if calibrating without the X, the user is “root”).
 
 
If the problem is under Debian Linux make sure you are properly logged in the XFCE interface! Else applying calibration would not happen for the current user - if you are calibrating from the X graphical interface make sure that you are logged as user “olimex” (if calibrating without the X, the user is “root”).
 
  
 
     #su olimex
 
     #su olimex
Line 571: Line 571:
 
     #sudo reboot
 
     #sudo reboot
  
It would be a good idea to test with Android or another Debian image also, it has a built-in calibration application by default.  
+
It would be a good idea to test with Android or another Debian image also, it has a built-in calibration application by default.
  
 
===How to add STK1160 video capture driver support in Kernel 3.4===
 
===How to add STK1160 video capture driver support in Kernel 3.4===

Latest revision as of 01:45, 6 December 2023

A20-OLinuXino.jpeg

A20-OLinuXino-MICRO features:

  • A20 Cortex-A7 dual-core ARM Cortex-A7 CPU and dual-core Mali 400 GPU
  • 1GB DDR3 RAM memory
  • Optional 4GB NAND FLASH memory
  • SATA connector with 5V SATA power jack
  • HDMI FullHD 1080p
  • 2x USB Low-Full-High-Speed hosts with power control and current limiter
  • USB-OTG with power control and current limiter
  • VGA output on 6-pin 1.25mm (0.05") step connector
  • 100MBit native Ethernet
  • LiPo Battery connector with battery-charging capabilities
  • Audio headphones output
  • Microphone input on connector
  • 2x UEXT connectors
  • LCD connector compatible with with 4.3", 7.0", 10.1" LCD modules from Olimex
  • 160 GPIOs on three GPIO connectors
  • MicroSD card connector
  • SD/MMC card connector
  • DEBUG-UART connector for console debug with USB-SERIAL-CABLE-F
  • status LED
  • Battery charge status LED
  • Power LED
  • 2KB EEPROM for MAC address storage and more
  • 10 BUTTONS with ANDROID functionality + RESET button
  • 4 mount holes
  • 6-16V input power supply, noise immune design
  • PCB dimensions: 142 x 82 mm


Contents

Official Images Released and Recommended by Olimex

Below you would find links to the official Debian and Android images. The images in this chapter were compiled by Olimex. They are recommended for beginners and first time users since they include full hardware support.

If you are an experienced embedded Linux professional you might also find build instructions to our images.

Linux Images

There are three different types of Olimex-made official Linux images:

  • Recent kernel and u-boot Armbian-based Ubuntu Bionic and Debian Buster Linux images for general purpose Linux experience
  • KODI images, LibreElec-based, if you wish to use your A20 board as TV box
  • Debian 8 Jessie images with v3.4.x sunxi kernel


The official Linux images should be downloaded to a microSD card. Images can be downloaded either from our FTP or via torrent client. You can install the Debian to the NAND or the eMMC of your board (if it comes with one). Information on booting Debian from the NAND or eMMC might be found in these wiki article: how to install Debian to NAND; how to install Debian to eMMC. Download locations for the official images might be found below:

Download locations Linux images

ALWAYS FIRST TEST WITH LATEST OFFICIAL IMAGE, NEWER HARDWARE REVISIONS OF THE BOARD MIGHT NOT WORK WITH OLDER IMAGES!!!


Main FTP hub folder for all Olimex-made A20 official images:

ftp://staging.olimex.com/Allwinner_Images/A20-OLinuXino/

Latest mainline kernel official images:

1. Latest Ubuntu Desktop Linux images can be found here: FTP directory with latest Ubuntu Bionic images

2. Latest Debian Server Linux images can be found here: FTP directory with latest Debian Buster images

Latest KODI player official images:

3. Latest KODI player LibreElec Linux images here: FTP directory with latest KODI/LibreElec images

Latest sunxi kernel official images (not recommended):

Latest sunxi-kernel (v3.4.x) Debian 8 Jessie Linux images here: FTP location with all sunxi-kernel Debian 8 images here

FTP link of official Debian Jessie release #18, suitable for boards with no extra flash memory or with extra eMMC flash memory (not suitable for boards with NAND memory): A20 OLinuxino Micro debian Jessie 34 103 2G eMMC release 18

FTP link of official Debian Jessie release #15, suitable for boards with no extra flash memory or with extra NAND memory (not suitable for boards with eMMC memory): A20-OLinuXino-MICRO Debian Jessie with kernel 3.4.103+ release 15

Image description and typical interfacing: description and basic usage of different peripherals at at the GitHub page

Image build instructions and required files for latest Debian Jessie release might be found here: build instructions and required files at the GitHub page

You can find some older releases and older build instructions (older image revisions might be used as a reference, for testing purposes, or if you own old hardware revision of the board) at the following article: older releases and older build instructions


Note: in the previous Debian releases the Ethernet was auto-detected and initialized during boot BUT this caused big delays in the start-up of the board if you didn't want to use Ethernet or if there wasn't Ethernet cable connected.

You can enable it by following these two steps:

1. To check under what name the LAN is associated write "ifconfig –a"

2. If, for example, it is under eth0 name, then write: "dhclient eth0"

This should enable the Ethernet and then SSH would also be available.

Android images

FTP links of official Android releases are below. Please read description of the image carefully.

FTP link of Android release 3 for NAND memory with HDMI and 7 inch LCD (800x480) support: A20-OLinuXino Android for NAND with HDMI and 800x480 video support

If you want to use it with our RTL8188ETV module then consider release #4:

A20-OLinuXino-MICRO Android for NAND memory with video settings for 800x480 display output + MOD-WIFI-RTL8188ETV module]

FTP of Android release 3 for NAND memory with HDMI and 10 inch LCD (1024x600) support: A20-OLinuXino Android for NAND with HDMI and 1024x600 video support

Torrent of Android release 1 for microSD card with HDMI and 7 inch LCD (800x480) support: A20-OLinuXino Android for microSD card with HDMI and 800x480 video support

Torrent of Android release 1 for microSD card with HDMI and 10 inch LCD (1024x600) support: A20-OLinuXino Android for microSD card with HDMI and 1024x600 video support

Build instructions and source files for the official Android images for A20 boards in this repository: https://github.com/hehopmajieh/olinuxino_configs

The Android image has the following features:

  • Android 4.2.2
  • NAND image i.e. will work only on A20-OLinuXino-MICRO-4GB
  • Supports 7" LCD 800x480 pixels and 10" LCD 1024x600 pixels
  • HDMI support (720p default)
  • both LCD and HDMI work together
  • Touchscreen supported
  • GPIO support
  • Native Ethernet 100Mbit
  • USB-Ethernet ASIX 88772
  • USB-WIFI RTL8188
  • USB-OTG support USB device and USB host with Low/Full/High speed
  • USB-HOST-top Low/Full/High speed
  • USB-HOST-bottom Low/Full/High speed
  • micro SD card
  • Audio OUT
  • Audio In
  • I2C1
  • I2C2
  • UART6
  • UART7
  • Buttons


What is left unsupported in Android:

  • SATA
  • SD-MMC card on bottom

Notable unofficial images

Below you would find locations to images released by the community. These are not officially supported by Olimex, however, some of these releases are pretty good and worth a try:

  • A20-OLinuXino-MICRO is supported by openSUSE Factory, installation instructions might be found here: openSUSE wiki link
  • A20-OLinuXino-MICRO is recognized by the Devuan community and there are official releases here might be found here: Devuan list of files link


Documents

A20-OLinuXino Board User Manual

A20-OLinuXino user manual

A20 Brief

A20 brief description

A20 Datasheet

A20 datasheet

A20 User Manual

A20 users manual

Hardware

Example.jpg


Power supply and consumption

A20-OLinuXino can be powered from three sources:

  • +6-16VDC voltage applied PWR jack
  • +3.7V from LiPo re-chargable battery connected to LiPo board connector
  • +5V applied to USB-OTG connector


Power consumption is as follows:

  • LiPo 3.7V power battery: 0.17-0.25A depend on processor load
  • +6VDC input power: 0.18-0.33A depend on processor load
  • +16VDC input power: 0.11-0.17A depend on processor load


Comparison table of power consumption might be found at the following link.

LiPo battery allow backup power supply when main power is interrupted. A20-OLinuXino have power managment IC which charge the battery when main power is present, when power is interrupted the LiPo battery automatically provide backup power supply. Step-up converter prvide 5V for the USB peripherials too. For LiPo batteries we recommend these:


Board dimensions

A20-OLinuXino-MICRO hardware revision M dimensions in mils:image in PNG format

A20-OLinuXino-MICRO hardware revision D dimensions in mils: image in PNG format

CAD files

A20-OLinuXino-MICRO is Open Source Hardware, CAD files are available at GitHub

The CAD product used to design OLinuXino is Eagle and you can download evaluation free version from their web.

Board Layout

A20-OLinuXino-FRONT.jpg


A20-OLinuXino-BACK.jpg

Be careful with TV monitors without grounding

Here you can read how easy you can damage your OLinuXino if you connect it to TV without grounding.

Software

Linux Commands

Linux-Commands Brief Linux Command reference

Python

pyA20 is Python library for access to A20-OLinuXino-MICRO GPIOs, I2C, SPI

Use:

   #!/usr/bin/env python
   
   import A20_GPIO as GPIO
   
   #init module
   GPIO.init()
   
   #configure module
   GPIO.setcfg(GPIO.PIN#, GPIO.OUTPUT)
   GPIO.setcfg(GPIO.PIN#, GPIO.INPUT)
   
   #read the current GPIO configuration
   config = GPIO.getcfg(GPIO.PIN#)
   
   #set GPIO high
   GPIO.output(GPIO.PIN#, GPIO.HIGH)
   
   #set GPIO low
   GPIO.output(GPIO.PIN#, GPIO.LOW)
   
   #read input
   state = GPIO.input(GPIO.PIN#)
   
   #cleanup
   GPIO.cleanup()

GPIO under Linux

A very good GPIO guide by Dr. Guido Pelz might be found here: https://github.com/OLIMEX/OLINUXINO/raw/master/HARDWARE/A20-PDFs/A20-GPIO.pdf

You can read data from a given GPIO port. The logical ranges are usually as follows: 0V-1V for LOW (or 0) and 2.4V-3.3V for HIGH (or 1). All voltages are measured against ground (GND).

If the input signal is to high, you will at least destroy the port!

In order to use A20 GPIO's first you have to export them. You can export a single GPIO:

   root@A20:~# echo gpioXX > /sys/class/gpio/export

To export a range of GPIOs (from 1-230 in the example below) use:

   root@A20:~#  for i in `seq 1 1 230`; do echo $i > /sys/class/gpio/export; done

list of all available GPIO

   root@A20:~# ls /sys/class/gpio/
   export       gpio21_pc3/  gpio33_pb8/  gpio45_ph27/ gpio57_ph17/ gpio69_pg5/
   gpio10_pe9/  gpio22_pc7/  gpio34_pb10/ gpio46_ph0/  gpio58_ph18/ gpio6_pe5/
   gpio11_pe10/ gpio23_pc16/ gpio35_pb11/ gpio47_ph2/  gpio59_ph19/ gpio70_pg6/
   gpio12_pe11/ gpio24_pc17/ gpio36_pb12/ gpio48_ph7/  gpio5_pe4/   gpio71_pg7/
   gpio13_pi14/ gpio25_pc18/ gpio37_pb13/ gpio49_ph9/  gpio60_ph20/ gpio72_pg8/
   gpio14_pi15/ gpio26_pc23/ gpio38_pb14/ gpio4_pe3/   gpio61_ph21/ gpio73_pg9/
   gpio15_pi0/  gpio27_pc24/ gpio39_pb15/ gpio50_ph10/ gpio62_ph22/ gpio74_pg10/
   gpio16_pi1/  gpio28_pb3/  gpio3_pe2/   gpio51_ph11/ gpio63_ph23/ gpio75_pg11/
   gpio17_pi2/  gpio29_pb4/  gpio40_pb16/ gpio52_ph12/ gpio64_pg0/  gpio7_pe6/
   gpio18_pi3/  gpio2_pe1/   gpio41_pb17/ gpio53_ph13/ gpio65_pg1/  gpio8_pe7/
   gpio19_pi10/ gpio30_pb5/  gpio42_ph24/ gpio54_ph14/ gpio66_pg2/  gpio9_pe8/
   gpio1_pe0/   gpio31_pb6/  gpio43_ph25/ gpio55_ph15/ gpio67_pg3/  gpiochip1/
   gpio20_pi11/ gpio32_pb7/  gpio44_ph26/ gpio56_ph16/ gpio68_pg4/  unexport

Example on how to write to a GPIO. For instance - toggle onboard LED. The LED is connected to PH2.

1. Export gpio47_ph2

   root@A20:~# echo gpio47 > /sys/class/gpio/export

2. Set PH2 as output

   root@A20:/sys/class/gpio/gpio47_ph2# echo out > direction

3. Set high position (1) of PH2 - LED is ON

   root@A20:/sys/class/gpio/gpio47_ph2# echo 1 > value

4. Set low position (0) of PH2 - LED is OFF

   root@A20:/sys/class/gpio/gpio47_ph2# echo 0 > value

Example on how to read GPIO (with GPIO #49):

1. Export GPIO 49

   echo 49 > /sys/class/gpio/export

2. Set input

   echo "in" > /sys/class/gpio/gpio49_ph9/direction

3. Read value GPIO 49

   cat /sys/class/gpio/gpio49_ph9/value 

4. Unexport GPIO 49 when finished

   echo 49 > /sys/class/gpio/unexport

Add Voice to your OLinuXino project

Installation of Festival on OLinuXino

How To?


How to correctly power off OLinuXino running from NAND Flash

In this Blog post we explain what are the problems. This is common problem for all computers running OS. Here you can read more about MLC NAND Flash and Linux file system.

Is it possible to boot Debian from NAND? Do you provide such image?

Yes, it is possible. Use the latest Debian Jessie image and write "nandinstall". More information can be found in this wiki article: installing Debian Jessie to the 4GB NAND memory

There are other people who are also successful in booting Debian from the NAND. Make sure to check on the forum. Make sure to check the number of very good and optimized A20-OLinuXino Debian images by Igor Pečovnik. There are also his instructions for NAND installation of Debian: link to his web-site

How to generate boot-able SD-card Debian Linux image for A20-OLinuXino?

Build instructions and required files for the latest Debian images: instructions and files at the GitHub page

Official Olimex wordpress article on how to extend the previous build of Debian Linux 3.4 with hardware acceleration support, keep a look at the wordpress for more interesting articles

Sunxi u-boot loader The linux-sunxi git page contains a lot of sources for all Olimex Allwinner boards.

How to download new Android image to the NAND memory of my A20 board?

To repair the image on the NAND re-upload it following these steps:

  • 2. Go to firmware tab of the program and point to a valid Android image (the latest official one may also be downloaded above).
  • 3. Disconnect the power supply and USB cable from the A20 board.
  • 4. Press and hold RECOVERY button, apply power supply (6-16)V, release RECOVERY button.
  • 5. Connect USB cable to the mini USB connector.
  • 6. You will be asked for drivers for the bootloader. Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables (or manually point the installer to the drivers folder in the PhoenixSuit installation path).
  • 7. PhoenixSuit will detect the board and would ask for the method of writing the image. Choose method of writing the image and confirm your wish to write the image.
  • 8. Wait till upgrade succeeds


Note that it is not recommended to have your mini USB connected to an external USB hub. This might cause delays and might distort the signal levels. Always test with the USB connected straight to the USB ports of your computer.

How do I write the official Android image to a micro SD card for my A20 board?

A: First download one of the official Android images, which might be found in the Android section above.

Make sure that the download link you visit clearly indicates that the image is suitable for the microSD card since there are images suitable for NAND memory also. The images suitable for the microSD memory and those suitable for NAND card are different. However, the upload method is almost identical – using PhoenixSuit.

There are two types of Android images for microSD card that we usually provide and each of them has to be downloaded to a microSD card using a different method. The image provided for microSD card is either the native Android image that can be downloaded to the card via a software tool like PhoenixSuit (through the board) or an image taken from an already prepared microSD card that requires to simply write the image (through a microSD card reader).

It is more likely that you have an Android image that requires a simple copy to a card. If that is the case you can follow the exact steps as for Linux (e.g. using "Win32 Disk Imager" or "dd" command).

In order to prepare a microSD card with a native Android you will need a software tool called PhoenixSuit and then:

• Install and run PhoenixSuit (can be found here: download from google drive)

• Go to the firmware tab of the program and point to a valid Android image (note that the images on Gdrive are compressed and you have to extract them to .img files to be able write them with PhoenixSuit)

• Disconnect the power supply and USB cable from the A20 board. Put an SD card in micro SD holder. We recommend 4GB class 10 card.

• Press and hold RECOVERY button, apply power supply (6-16)V, release RECOVERY button.

• Connect USB cable to the mini USB connector.

• You will be asked for drivers for the boot-loader. Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables (or manually point the installer to the drivers folder in the PhoenixSuit installation path).

• PhoenixSuit will detect the board and would ask for the method of writing the image. Choose method of writing the image and confirm your wish to write the image.

• Wait till upgrade succeeds

Note that it is not recommended to have your mini USB connected to an external USB hub. This might cause delays and might distort the signal levels. Always test with the USB connected straight to the USB ports of your computer.

Important: When Android runs for very first time it takes several minutes to initialize all files and buffers please do not cut the power supply during this process! Also when fresh image is installed fast boot may be disabled, which means that when you apply power supply after few seconds Android will go in sleep mode and you have to press POWER button to start it, you can change to fast boot when you power off there is dialog box asking you if you want next boot to be fast boot, you have to check this box before you power off. Also note that you must do touch screen calibration when you run Android for very first time which might require a mouse.

How do I write the Linux image to a micro SD card to use with my A20 board?

To write a Linux image to an SD card under Windows we use Win32 Disk Imager):

  • Download Win32 Disk Imager Win32 Disk Imager
  • Insert card
  • Start program
  • Select file
  • Click "write"


To write a Linux image to an SD card under Linux:

For instance you have an image with the file name of "debian_2g.img". It would be downloaded to the SD card connected to a Linux machine using one of the following commands:

  • # dd bs=4M oflag=sync if=debian_2g.img of=/dev/sdX

or

  • # cp debian_2g.img /dev/sdX


where X is the uSD card.

How to change HDMI, VGA and LCD resolutions in the official Debian image?

The default SD card setup is made with settings for HDMI 720p/60Hz. If you want to change to some other LCD, VGA or HDMI resolution then you have to start change_display.sh script file in /root directory. When you are logged as super user in the board type:

  For Debian Wheezy releases: ./change_display* (* = press 'tab')
  For Debian Jessie releases: change_display* (* = press 'tab')

and press "Enter".

Note that the script should be executed as super user. Under the command line interface you are automatically logged as super user (user "root", password "olimex"). However, under the graphical environment you are not auto-logged as super user and you must type "sudo" before the command (in the GUI the super-user is "olimex" and the password is "olimex")

Then choose the resolution and the interface(LCD, HDMI or VGA). Note that the selection of a specific resolution is done by navigating with the arrow keys and pressing "space" button. Make sure the asterisk marks your selection properly.

The supported resolutions are:

For LCD:

  • 1. 4.3" (480x272)
  • 2. 7" (800x480)
  • 3. 10" (1024x600)
  • 4. 15.6" (1366x768)

Important: initially the boards are calibrated for a specific display. If you re-write the image (no matter whether the SD card or the NAND memory) you would need to use a mouse to calibrate the display initially. It might be impossible to calibrate it via touching the display.

For HDMI:

  • 0. 480i
  • 1. 576i
  • 2. 480p
  • 3. 576p
  • 4. 720p50
  • 5. 720p60
  • 6. 1080i50
  • 7. 1080i60
  • 8. 1080p24
  • 9. 1080p50
  • 10. 1080p60


For VGA: (note that the VGA signals are routed to custom 6 pin connector and you need from adapter to standard VGA connector)

  • 0. 1680x1050
  • 1. 1440x900
  • 2. 1360x768
  • 3. 1280x1024
  • 4. 1024x768
  • 5. 800x600
  • 6. 640x480
  • 7. 1920x1080
  • 8. 1280x720


How to generate Arch Linux image?

Recent forum post by user progmetalbg here: at Olimex forums

Older step by step instructions on how to build Arch Linux image

How to detect and enable the Ethernet controller (if it is disabled by default)?

Note: in the previous Debian releases the Ethernet was auto-detected and initialized during boot BUT this was causing big delays in the start-up of the board if you didn't want to use Ethernet or if there wasn't Ethernet cable connected.

You can enable it by following these two steps:

1. To check under what name the LAN is associated write "ifconfig –a"

2. If, for example, it is under eth0 name, then write: "dhclient eth0"

This should enable the Ethernet and then SSH would also be available.

How to install Android on SD-card?

Blog post about it

How to access UART, I2C, GPIOs under Android?

Use our Open Source OLinuXino A20-TOOLS

How to control PWM under Linux?

There is an article here: how to add pwm

How to build the Android 4.2.2 image for A20-OLinuXino-MICRO?

First you need to Download the A20 SDK2.0 Linux Kernel 3.4

Second you need to configure your environment read the instructions here

Then Build the kernel, kernel modules and u-boot

   cd lichee
   ./build.sh -psun7i_android

When done, continue with Bulding the android image:

   cd ../android4.2
   cd device/softwinner/
   tar zxfv olinuxino-a20.tgz
   cd ../../
   source build/envsetup.sh
   lunch #select olinuxino-a20_eng
   extract-bsp
   make -j4

Dave from Axon instruments wrote more detailed blog post about how he generates the Android image

I don't have neither serial cable, nor HDMI monitor. I also can't access the local Ethernet network. Can I somehow access the board anyway?

The latest official Debian Linux image allows the use the USB_OTG connector for SSH connection without the need of a LAN cable or a serial cable. You can use a mini USB cable connected between your host PC and the on-board mini USB connector. For connection convenience there is a DHCP server running specifically for USB0 interface. The DHCP server should give IP address to the new USB0 interface of your host PC so you can make SSH connection from your PC to the default board IP address of the USB0 interface – 192.168.2.1.

You can connect to the board using a mini USB cable and an SSH client (if you use Windows you might use "puTTY", for example) at address 192.168.2.1.

For Windows operating system - upon connection, the board should show up in "Windows Device Manager" as "RNDIS Ethernet Gadget". You might be asked to install a driver. The drivers can be found online as "RNDIS driver" (Remote Network Driver Interface Specification). The drivers are provided by Microsoft and they should be available for every Windows distribution - refer to the respective files and articles provided by Microsoft on how to install the required drivers.

How to edit board configurations and definitions in the official Debian Linux?

Do you want a custom video resolution output? Do you need a different port definition? Do you need to change the hardware defitions of the board?

You would need to edit the board's script.bin/script.fex file. How to do it is described in another separate article: How_to_edit_board_configurations_and_definitions_in_the_official_Debian_Linux.

How to properly calibrate a display under Debian

Latest Debian Jessie images should be calibrated as detailed here: https://www.olimex.com/wiki/Touch_calibration_official_images

If using older Debian Wheezy image follow the algorithm below:

Make sure you are properly logged in the LXDE visual interface! Else applying calibration would not happen for the current user - if you are calibrating from the X graphical interface make sure that you are logged as user “olimex” (if calibrating without the X, the user is “root”).

   #su olimex

enter the olimex password:olimex

   #sudo ts_calibrate

calibrate the touch screen and reboot the board

   #sudo reboot

It would be a good idea to test with Android or another Debian image also, it has a built-in calibration application by default.

How to add STK1160 video capture driver support in Kernel 3.4

STK1160 driver backport by Dimitar Tomov


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