[PATCH 1/1] efi_loader: QEMU CONFIG_EFI_GRUB_ARM32_WORKAROUND=n

[Tom Rini <trini@konsulko.com>]

On Fri, Sep 18, 2020 at 07:14:02PM +0200, Heinrich Schuchardt wrote:
> On 9/18/20 1:28 PM, Tom Rini wrote:
> > On Fri, Sep 18, 2020 at 06:07:42AM +0200, Heinrich Schuchardt wrote:
> >> Am 17. September 2020 20:53:20 MESZ schrieb Tom Rini <trini@konsulko.com>:
> >>> On Thu, Sep 17, 2020 at 08:03:24PM +0200, Heinrich Schuchardt wrote:
> >>>> On 9/17/20 7:47 PM, Tom Rini wrote:
> >>>>> On Thu, Sep 17, 2020 at 07:18:08PM +0200, Heinrich Schuchardt
> >>> wrote:
> >>>>>
> >>>>>> CONFIG_EFI_GRUB_ARM32 is only needed for architectures with caches
> >>> that are
> >>>>>> not managed via CP15 (or for some outdated buggy versions of
> >>> GRUB). It
> >>>>>> makes more sense to disable the setting per architecture than per
> >>> defconfig.
> >>>>>>
> >>>>>> Move QEMU's CONFIG_EFI_GRUB_ARM32_WORKAROUND=n from defconfig to
> >>> Kconfig.
> >>>>>>
> >>>>>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> >>>>>> ---
> >>>>>>  configs/qemu_arm_defconfig | 1 -
> >>>>>>  lib/efi_loader/Kconfig     | 1 +
> >>>>>>  2 files changed, 1 insertion(+), 1 deletion(-)
> >>>>>
> >>>>> Why?  Are we about to move this to be a short list of "default y if
> >>> ..."
> >>>>> instead?  Otherwise no, this is the level of detail that should be
> >>> in a
> >>>>> defconfig I think and not Kconfig.
> >>>>>
> >>>>
> >>>> Hello Tom,
> >>>>
> >>>> yes, in the long run I want to turn this into "default y if". But I
> >>>> first need to a list of all ARCH_* which have a cache which is not
> >>>> controlled via CP15.
> >>>
> >>> Isn't the bigger problem / list "needs to support old / buggy GRUB" ?
> >>
> >> There are no operating systems distributing 2021 U-Boot with 2018 GRUB.
> >
> > Then we should remove default y there after v2020.10 I think, and get
> > the distro folks to ack/review that.  I don't think there's any cases of
> > "SoC doesn't use CP15 for cache" and "SoC uses GRUB".
> 
> How about l2_cache_disable() in arch/arm/mach-kirkwood/cache.c?

What's the board that uses that and where "SoC uses GRUB" comes in to
play.  What are the board(s) there we're talking about?

-- 
Tom
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