How to start barebox on Freescale iMX28 EVK

[Maxime Ripard]

Hi,

Le 29/06/2012 11:29, Sascha Hauer a écrit :
> On Fri, Jun 29, 2012 at 11:11:59AM +0200, Maxime Ripard wrote:
>> Anyone ?
>>
>> Le 18/06/2012 15:07, Maxime Ripard a écrit :
>>> Hi everyone,
>>>
>>> I'm trying barebox on the imx28 evk evaluation board from freescale, and
>>> I can't get barebox to boot yet.
>>>
>>> I think I might have a problem with the bootlets used, but I'm not sure.
>>>
>>> So, to compile barebox, I did:
>>> ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make imx28evk_defconfig
>>> ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- make
>>>
>>> Using codebench 2011.09 toolchain.
>>>
>>> Then, I used U-boot IVT bootlet from freescale bootlet tarball as a base
>>> for the one I created [1].
>>>
>>> After that, I created the bootstream using
>>> elftosb -z -f imx28 -c  ./barebox_ivt.bd -o imx28_ivt_barebox.sb
>>>
>>> Finally, I pushed on a properly formatted SD Card (with a 0x53 partition
>>> flag on the first partition) using Freescale mk_hdr script[2] to
>>> generate the proper headers:
>>>
>>> ./mk_hdr.sh `sudo fdisk -lu /dev/sdb | awk '$5==53 {print $2}'` 1  >
>>> temp.bin
>>>
>>> sudo dd if=temp.bin of=/dev/sdb1 ibs=512 conv=sync
>>> sudo dd if=imx28_ivt_barebox.sb of=/dev/sdb1 ibs=512 obs=512 seek=1
>>> conv=sync
>>>
>>> When I finally plug the card in and boot the card, the two first
>>> bootlets are properly executed, and then, it hangs, displaying nothing
>>> but what is looking like an address: 0x8050100f
> 
> This code comes from the i.MX28 ROM and means:
> 
> Requested data beyond the end of a section.
> 
> Maybe your entry point is wrong? I just had a look at our .bd file and
> it looks like this:
> 
> sources {
>         power_prep="./power_prep/power_prep";
>         u_boot="/home/sha/dude/bosch/OSELAS.BSP-Bosch-SCM/platform-scm/build-target/barebox-2012.05.0/barebox";
> }
> 
> section (0) {
> 
>         //----------------------------------------------------------
>         // Power Supply initialization
>         //----------------------------------------------------------
> 
>         load power_prep;
>         load ivt (entry = power_prep:_start) > 0x8000;
>         hab call 0x8000;
> 
>         //----------------------------------------------------------
>         //  Load and call u_boot - ELF ARM image
>         //----------------------------------------------------------
> 
>         load u_boot;
>         load ivt (entry = u_boot:exception_vectors) > 0x8000;
>         hab call 0x8000;
> 
> }

Yep, it was just that. Changing the entry point to exception_vectors did
the trick. Thanks a lot!

Maxime

-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com