Re: [Buildroot] [PATCH v4 2/3] configs/stm32f746_disco_sd: new defconfig

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Dario, All,

On 2024-08-31 14:08 +0200, Dario Binacchi spake thusly:
> The commit adds support for STM32F746G-DISCO board. The discovery kit is
> a complete demonstration and development platform for STMicroelectronics
> Arm Cortex-M7-core-based STM32F746NG.
> 
> Board support package includes the following components:
> - mainline Linux kernel 5.15.165
> - mainline U-Boot 2024.07
> - default packages from buildroot
> 
> Link: https://www.st.com/en/evaluation-tools/32f746gdiscovery.html
> Co-Developed-by: Waldemar Brodkorb <wbx@openadk.org>
> Tested-by: Waldemar Brodkorb <wbx@openadk.org>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

As we've discussed at the dev-days, this configuration generates a
system that is not entirely stable: after a few commands, the following
ones fail to run.

This happens whether you use the 'u-boot' partition, or not, as
suggested by Thomas. In the first case, one can run more commands than
in the second case; in either case, the system is quickly unstable. As
Waldemar suggested, this is most probably due to memory being quickly
fragmented.

One suggestion that emerged during the discussion was to move the kernel
to the flash, and be XIP, so that more memory is free to run commands.
Of course, the internal flash is only 1MiB, but there is a Q-SPI flash
that is 16MiB; if that one can be memory-mapped, then it would be
possible to have a XIP kernel, and keep only the rootfs on the SDcard.

So, for now, we've decided to drop the configuration.

Thanks for the explanations!

Regards,
Yann E. MORIN.

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