Re: [Buildroot] [PATCH 1/1] configs/rzboard_v2L_defconfig: new defconfig

["kilian.zinnecker--- via buildroot" <buildroot@buildroot.org>]

Hello Thomas, Giulio, all,

Thanks Giulio for reviewing my patch and your feedback!

[--SNIP--]

> Thanks, I have applied to master, after renaming to
> avnet_rzboard_v2l_defconfig, and taking into account the feedback from
> Giulio.

Thanks for fixing the issues and applying the patch!

> However, I find it not so nice that we don't build a fully bootable
> image that includes U-Boot. Could you work on this and submit a
> follow-up patch?
> 
> There is a DIP switch on the board that allows to boot from SD, see
> page 15 of the board hardware manual;

Yes, I agree and would prefer a bootable image, containing a uboot built by 
buildroot as part of the boot chain, too. I therefore tried to run uboot from 
SD card at first (using the information from the hardware manual you refered 
to), but I was not successful. Hence I asked the author of a hackster.io 
article about the RZBoard V2L boot [1], whether he could help me. He told me, 
that he asked the Avnet BSP team, and "they confirmed there is no official 
support for storing bootloader files on micro sd". This matches his article, 
listing only eMMC and QSPI as possible locations for the bootloader.

However, maybe this information is incomplete and there is in fact a way to 
run uboot from SD card, which I just was not able to get working. I can try to 
reach out to the Avnet support myself. And even if there is no way to do that, 
I can try to adjust the board support to build uboot, figure out how to flash 
uboot to the eMMC and document that in the readme. May take me some time 
though at the moment. 

Best regards,
Kilian

[1] https://www.hackster.io/lucas-keller/mastering-rzboardv2l-emmc-micro-sd-and-network-booting-dc87f3



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