Olimex Support Forum

OLinuXino Android / Linux boards and System On Modules => iMX233 => Topic started by: kerob_labs on March 16, 2016, 11:05:30 am

Title: IMX233 blink led
Post by: kerob_labs on March 16, 2016, 11:05:30 am
Hello all!

It's been a while I got my IMX233 Olinuxino Mini, I played a bit with ARM Linux :), but my intention was to port my own embedded RTOS onto it :o, it's very very close to a bare-metal. So the obvious starting point was the famous blink led code that runs as bare metal. Unfortunately I can't make it work...

What I tried:

1) following this:


with no luck so,

2) I tried that:


I tried both links above in hope to see a blinking led. From the attempt (1), his steps are a bit confusing because it mixes BCB calling ./make_boot_image.sh with MBR using dd (as stated, my intention was just run blink led, I skipped OpenOCD setup). Anyway, I suppose I'm using MBR because I do dd in the first 0x53 type partition to write u-boot and things work perfectly.

Trying (2), I do "make all" and create the image as shown below:

elftosb2 -V -z -c 1st_bootloader.db -o ./output/1st_bootloader_sb.bin

my .db file is standard:

sources {
    image = "output/1st_bootloader.elf";

section (0) {
    load image;
    jump image;

Then do dd to write to my SD card (I confirmed it is /dev/sdb1, but may vary)

sudo dd if=./output/1st_bootloader_sb.bin of=/dev/sdb1 bs=512 seek=4

When I power up my iMX233 Mini I get this error from the bootloader shown via uart:


to be DCP status error (I suppose the binary was not correctly decrypted?)
In this case, what am I doing wrong here?  :-\



Title: Re: IMX233 blink led
Post by: JohnS on March 16, 2016, 03:44:08 pm
I guess you found Chap. 35 of iMX23 ref man.

Maybe the details of bootlets at https://github.com/koliqi/imx23-olinuxino will help

Also, this http://wiki.openwrt.org/toh/olimex/imx233-olinuxino mentions putting u-boot on SD and I suppose you are replacing u-boot in effect.

If you get your RTOS (or other) code working I guess it may be of interest to others.  Olimex may even put it on their pages.

Title: Re: IMX233 blink led
Post by: kerob_labs on March 17, 2016, 01:27:00 am
Yeah, I'm familiar with Chap 35...

Indeed my OS has got a boot loader similar to u-boot that loads a binary from a FAT partition in memory and execute. u-boot is very tied to Linux.

I tried a couple of combination but no luck to make it work. Have you tried the blink led project by any chance?

Title: Re: IMX233 blink led
Post by: JohnS on March 17, 2016, 11:05:23 am
I am happy with Linux.

How about starting with a Linux image with uboot.  dd it to an SD card and check it boots & works.

Now look at the image to find uboot.  You should be able to recognise it.

I suppose it won't start where you wrote your file or will have something about it that is relevant to why your simple program does not work.

Or, hope to find a makefile for Linux/uboot that writes to the SD card and figure why that works but your program doesn't.

Title: Re: IMX233 blink led
Post by: jubjubmane on March 26, 2016, 06:05:06 am
Very nice, it makes me understand more.
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