Re: [Buildroot] [PATCH v2 4/4] board/ti: add new boards

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Giulio

On Sun, 31 Jul 2022 03:15:17 +0200
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> I don't know the boot-flow of this processor, so you need the SPL and
> then again another SPL and u-boot too?

This was explained in previous iterations of the patch series, and to
some extent in the commit log of PATCH 2/4 (though perhaps not very
clearly).

This SoC is kind of special. It needs a U-Boot that runs on the
Cortex-A cores, built ARM64. But it also needs a firmware running on a
separate Cortex-R5 core, and it turns out that this firmware is also...
U-Boot.

So indeed, we need to build two U-Boots: one for the ARM64 cores, one
for the Cortex-R5 core. The U-Boot for the ARM64 cores is built using
boot/uboot/, like for all platforms. The special U-Boot for Cortex-R5
is built using the boot/ti-k3-r5-loader package.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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