Linux rk3188 3.0.36+ #285 SMP PREEMPT Thu Apr 2 15:42:33 EEST 2015 armv7l
root@rk3188:~# ./change_display.sh
-bash: ./change_display.sh: No such file or directory
Isn't that for A20, such as LIME?
John
Good evening.
Look at the first line. It is for rk3188 SOM EVB.
As it was said in manual - look at page 18
https://www.olimex.com/Products/SOM/RK3188/RK3188-SOM/resources/RK3188-SOM-UM.pdf
Today I've tried command xrandr, and received such output:
//
olimex@rk3188:~$ xrandr --size 1280x1024
Can't open display
//
So as a result at present moment, I can't connect my RK3188-SOM-EVB-4G to any monitor that I have.
I have Samsung 940N with native resolution 1280x1024x50Hz, Asus - 1400x900, Benq 1920x1280x50Hz and two laptops. For connection to them, I'm using hdmi- vga converter. And I'm sure it is all right, it works perfectly with Raspberry (that have less MIPS, as olimex said in bucklet)
The manual says:
//
In case you need a custom video output resolution you would need to edit the kernel. There are no
configuration files that can be easily edited to achieve the desired video output.
//
But I can't find any clue what commands I should use for that.
Here:
https://www.olimex.com/wiki/RK3188-SOM
is nothing about it.
Wow, that's odd.
What does ls show?
Also, try such as
find -name 'change*sh'
John
I've tried as you said, and it works.
First of all system found ./change_display.sh and then I could use this command
//seems strange for me
; but Thx a lot, this was helpful
!!!!!
BUT now after this operation I encountered the next trouble.
!!!!!
My debug UART listens for my commands, but I cannot receive no visible response from debug UART. My board implement such commands as 'reboot' or 'poweroff' (any with visible response) from debug UART, but I cannot see no response in Putty monitor.
And in the same time I can see full output by SSH. //look screenshots below
I cannot understand how to add an image in this post, so look up my OneDrive:
https://onedrive.live.com/redir?resid=5A5BDCFF217CCCDA!73747&authkey=!AFA7dRbXZ0anZnU&ithint=folder%2cpng
or I can put it on my website with detailed description of all issues that I'm encountering.
I successfully re-flash NAND, I tried to remove and insert battery, I tried to boot from SD image, I tried different UART-to-USB converters (I have three of them, one yours, that I ordered with board and two CP2102 mine). And I'm an embedded engineer, so I don't confuse RX and TX.
So I think I tried everything. Nothing was helpful, UART listens to me, but does not answer.
I'm not seeing 'olimex@rk3188:~$', nothing, at all.
I should turn on echo to see what I'm typing.
And else. I'm working with your device in ESD protective wristband, I know what is 5V TTL and 3.3V CMOS levels (cp2102 can implement both).
I'm sure it should be simple explanation of what happening, but I can't find it.
On Мonday, I will test UART lines with oscilloscope, but it seems to me, that my RK shoud prepare for long trip to motherland)))
B.R. Constantine Laskov.
I don't understand why you say "your". I don't work for Olimex.
John
Sorry JohnS, I was not going to offence you anyhow.
Thank you for your support and quick response.
I decided to remove this one-side dialog to my site:
http://microelk.azurewebsites.net/RK3188/RK3188.
Maybe this will attract attention of OLIMEX's support engineers.