ARM errata 430973 on multi platform kernels (was: OMAP3-N900: Add microphone bias voltages)

[Sebastian Reichel]

On Fri, Apr 03, 2015 at 02:21:48PM -0500, Robert Nelson wrote:
> >> And yes, for armhf userland one gets random oopses at least on the
> >> Nokia N900. AFAIK this is not true for all ARMv7 processors
> >> (especially non omaps), though.
> >>
> >> > http://www.spinics.net/lists/linux-omap/msg108511.html
> >> >
> >> > See also 5c86c5339c56 ("ARM: omap2plus_defconfig: Enable ARM erratum
> >> > 430973 for omap3").
> >>
> >> For me the random oopses occur without this config flag and are
> >> fixed by it. The workaround is not very suitable for multi platform
> >> kernels, though, since its enabled also for unaffected platforms.
> >>
> >> As far as I can see the CONFIG_ARM_ERRATA_430973 flag is checked
> >> in proc-v7.S and in proc-v7-2level.S. I think the first file is
> >> irrelevant, since it can be fixed later (see workaround in
> >> nokia_n900_legacy_init in pdata-quirks.c).
> >
> > Yes so it seems, and the bootloaders should really set it. It's
> > also disabled for multiplatform builds.
> 
> These are now done in u-boot as of: v2015.04-rc4
> 
> http://git.denx.de/?p=u-boot.git;a=commit;h=c6f90e1418a84fe5fa463b38403bd1845cb6a59c

Seems like "include/configs/nokia_rx51.h" has been forgotten. Note,
that the kernel must still be able to enable the bit itself (in case
NOLO is used without u-boot).

-- Sebastian
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