U-Boot as ARM Coreboot Payload (for Chromebook Duet)

[Simon Glass]

Hi Matthew,

On Sun, 2 Aug 2020 at 20:17, Matthew Grochowalski <matt at gwalski.com> wrote:
>
> Hello,
>
> Reading https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md,
> it appears U-Boot should work as an alternate firmware on new ARM
> Chromebooks.
>
> Trying on my Duet (Kukui/Krane), this doesn't work. Looking at the
> RW_LEGACY contents, there's basically nothing there from the factory.
>
> I tried "make coreboot_defconfig" from u-boot master, but it looks
> like this is x86 only.
>
> Any way to get this working on ARM(64)?

I think this is Mediatek and U-Boot doesn't have support for that
particular MT part, at least in mainline. I suspect it will happen at
some point.

The altfw U-Boot feature works on x86 Chromebooks only, at present.
That said, most tegra and rockchip Chromebooks support U-Boot running
'bare-metal'.

Regards,
Simon