Re: [PATCH 11/13] arm: npcm: drop selecting non-existing ARM_ERRATA_794072

[Joel Stanley]

On Thu, 28 Oct 2021 at 14:57, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> On Thu, Oct 28, 2021 at 4:19 PM Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx> wrote:
> >
> > There is no and never was a Kconfig for ARM_ERRATA_794072 in the kernel
> > tree. So, there is no need to select ARM_ERRATA_794072 in
> > ./arch/arm/mach-npcm/Kconfig.
> >
> > Simply drop selecting the non-existing ARM_ERRATA_794072.
> >
> > This issue was discovered with ./scripts/checkkconfigsymbols.py.
> >
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
> > ---
>
> Could this be a typo? Maybe we need to enable a different errata workaround
> here, or maybe that code is actually needed and has to get sent.

Doing some searching, u-boot had a workaround for something called
ARM_ERRATA_794072.

https://github.com/u-boot/u-boot/commit/f71cbfe3ca5d2ad20159871700e8e248c8818ba8

Lore has the review history for that patch:

https://lore.kernel.org/all/6be32e0b5b454ed7b609317266a8e798@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

It looks like it's the same workaround as ARM_ERRATA_742230, which the
kernel does implement.

It would be good to hear from the Nuvoton people, or an Arm person.

Cheers,

Joel