[PATCH] ARM: dts: ux500: Reserve memory carveouts

[Linus Walleij]

On Mon, Dec 14, 2020 at 10:21 AM David Hildenbrand <david at redhat.com> wrote:

> > ARM SoC folks: please apply this directly for fixes.
>
> Can we come up with a Fixes: tag or has this been broken forever?
> (assuming modern boot loaders)

It's been broken forever :/

> > David: just FYI if you run into more of these type of
> > regressions. Actually the patch is unintentionally good
> > at smoking out other bugs :D
>
> Thanks for CCing - I'm adding some people that ran into similar issues,
> but not sure if the other bugreports are related (or have similar root
> causes).

Yeah we first were convinced there was something wrong with
the patch you made but I read it over and over again and there
is nothing wrong with it at all. It just alters the behaviour pattern of
memory management in some apparently drastic ways.

After a lot of silent crashes I finally got an external abort with
a reasonable backtrace showing the PTE pointing to this
modem memory and then we figured it out.

Yours,
Linus Walleij