[U-Boot] arndale: Apply Cortex-A15 errata #773022 and #774769

[Tom Rini]

On Tue, Sep 29, 2015 at 10:27:09AM +0100, Ian Campbell wrote:

> We run 4 Arndale boards in our automated test framework, they have
> been running quite happily for quite some time using a Debian Wheezy
> userspace.
> 
> However when upgrading to a Debian Jessie we started seeing frequent
> segmentation faults from gcc when building the kernel, to the extent
> that it is unable to successfully build the kernel twice in a row, and
> often fails on the first attempt.
> 
> Searching around I found https://bugs.launchpad.net/arndale/+bug/1081417
> which pointed towards http://www.spinics.net/lists/kvm-arm/msg03723.html
> and CPU Errata 773022 and 774769.
> 
> This errata needs to be applied to all processors in an SMP system,
> meaning that the usual strategy of applying them in
> arch/arm/cpu/armv7/start.S is not appropriate (since that applies to
> the boot processor only). Instead we apply these errata in the secure
> monitor which is code that is traversed by all processors as they are
> brought up.
> 
> The net affect on Arndale is that ACTLR changes from 0x40 to
> 0x2000042. I ran 17 kernel compile iterations overnight with no
> segfaults.
> 
> Runtime testing was done on our v2014.10 based branch and forward
> ported (with only minimal and trivial contextual conflicts) to current
> master, where it has been build tested only.
> 
> I suppose in theory these errata apply to any Exynos5250 based boards,
> but Arndale is the only one I have access to and I have therefore
> chosen to be conservative and only apply it there.
> 
> Also, reorder CONFIG_ARM_ERRATA_794072 in README to make the list
> numerically sorted.
> 
> Signed-off-by: Ian Campbell <ian.campbell at citrix.com>

Applied to u-boot/master, thanks!

-- 
Tom
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