[PATCH v2 9/9] arm: Migrate Apple M1 to save_prev_bl_data

[Mark Kettenis]

> From: Simon Glass <sjg at chromium.org>
> Date: Tue, 28 Mar 2023 08:32:45 +1300
> 
> Hi Mark,
> 
> On Tue, 28 Mar 2023 at 08:19, Mark Kettenis <mark.kettenis at xs4all.nl> wrote:
> >
> > > From: Simon Glass <sjg at chromium.org>
> > > Date: Tue, 28 Mar 2023 08:02:24 +1300
> > >
> > > Hi,
> > >
> > > On Mon, 27 Mar 2023 at 23:47, Konrad Dybcio <konrad.dybcio at linaro.org> wrote:
> > > >
> > > > Mark's and Dzmitry's approaches come down to the same thing.. Let's
> > > > unify them by first removing the static keyword from the common file
> > > > to allow the variable to be reused, then renaming "reg0" to the more
> > > > sensible fw_dtb_pointer coming from the Apple file and finally remove
> > > > the mach-apple implementation of this very thing and enable the common
> > > > approach in the respective defconfig.
> > > >
> > > > Only build-tested.
> > > >
> > > > Signed-off-by: Konrad Dybcio <konrad.dybcio at linaro.org>
> > > > ---
> > > >  arch/arm/lib/save_prev_bl_data.c    | 14 +++++++-------
> > > >  arch/arm/mach-apple/Makefile        |  1 -
> > > >  arch/arm/mach-apple/lowlevel_init.S | 17 -----------------
> > > >  configs/apple_m1_defconfig          |  1 +
> > > >  4 files changed, 8 insertions(+), 25 deletions(-)
> > >
> > > Perhaps we could start using a bloblist (in preparation for the coming
> > > Firmware Handoff [1] [2]) to pass information between stages?
> >
> > We don't have TPL or SPL on these machines, only U-Boot proper.  And
> > the handoff protocol between m1n1 and U-Boot is defined by [3].  I
> > have zero interest in changing that and my guess is that Hector Martin
> > feels the same.
> 
> This has nothing to do with TPL, nor SPL. It is a way of communicating
> between projects.
> 
> I hope you can both find the time and inclination to support firmware
> standardisation as it evolves.
> 
> Projects need to work together.

https://xkcd.com/927/