Re: MMC prepare for zynq

[Gwenhael Goavec-Merou <gwenj@trabucayre.com>]

Hi,
Thanks for informations: after deleting everything but the last two lines, 
barebox starts has expected.
Now I have and error with SDCard but maybe related to lines removes or something 
similar.

Thanks!

Gwenhael

Le 04/07/2025 à 7:38 PM, Johannes Roith a écrit :
> Hi Gwenhael, hi Ahmad
> 
> Am Fri, Jul 04, 2025 at 04:56:01PM +0200 schrieb Ahmad Fatoum:
>> Hi Gwenhael,
>>
>> On 7/3/25 09:18, Gwenhael Goavec-Merou wrote:
>>> Dear all,
>>>
>>> I'm trying to uses my zedboard with barebox but can't be able to boot this.
>>>
>>> According to mails found in this mailing list I have done this sequence:
>>>
>>> export ARCH=arm
>>> export CROSS_COMPILE=$SOMEWHERE/arm-buildroot-linux-gnueabihf-
>>>
>>> make zynq_defconfig
>>> make -j$(nproc)
>>
>> That looks correct IMO.
>>
>>> And copied in the first SDCard FAT partition:
>>> - images/barebox-avnet-zedboard.img as BOOT.bin
>>> - barebox.bin
>>
>> Which binary is barebox.bin?
> 
> The first one is the correct one. Just copy the images/barebox-avnet-zedboard.img
> with the name BOOT.bin to an SD-Card whose first partition is FAT32.
>>
>>> But I have nothing displayed through serial port.
>>
>> Two things come to mind:
>>
>> - The Image is 184K. Does the Zynq enforce a maximum limit on the BOOT.BIN?
> 
> Yes, there is a limitation for the size of the First Stage Bootloader
> (FSBL) as Xilinx calls it, which is the available SRAM size in the ZYNQ
> 7000 (192 kBytes). Currently Barebox PBL and Barebox Proper are combined
> to one image (images/barebox-avnet-zedboard.img) but you will get an
> error in the build process, if your image exceeds this size.
>>
>> - Does DEBUG_LL produce any output? For details on how to configure
>> DEBUG_LL, see the troubleshooting guide I just Cc'd you on.
>>
>>> Are there somewhere details on how to prepare SD Card for a zynq board?
>>
>> I haven't done work with the Zynq 7000 so far, but Lucas and Johannes
>> did. I Cc'd them as they may be able to give some tips for troubleshooting.
> 
> I would also take a look at this message on the mailing list:
> 
> https://lore.barebox.org/barebox/DB7PR02MB43323CD77E0507E560475BCAABF00@DB7PR02MB4332.eurprd02.prod.outlook.com/
> 
> Here, the content of the file
> arch/arm/boards/avnet-zedboard/zedboard.zynqcfg caused a boot error for
> barebox. With my Digilent Cora Z7 board, I also had to modify the file
> by deleting everything but the last line, to get barebox booting. Have
> you already tried this?
> 
>>
>> Cheers,
>> Ahmad
>>
>>>
>>> Thanks
>>>
>>> Gwenhael
>>>
>>>
>>
>> -- 
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>>
> 
> Best regards,
> Johannes