From: Stephen Warren <swarren@wwwdotorg.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/3] ARM: implement some Cortex-A9 errata workarounds
Date: Fri, 01 Mar 2013 14:53:33 -0700 [thread overview]
Message-ID: <5131235D.4030507@wwwdotorg.org> (raw)
In-Reply-To: <512F8F11.3080204@wwwdotorg.org>
On 02/28/2013 10:08 AM, Stephen Warren wrote:
> On 02/26/2013 03:28 PM, Stephen Warren wrote:
>> From: Stephen Warren <swarren@nvidia.com>
>>
>> Various errata exist in the Cortex-A9 CPU, and may be worked around by
>> setting some bits in a CP15 diagnostic register. Add code to implement
>> the workarounds, enabled by new CONFIG_ options.
>>
>> This code was taken from the Linux kernel, v3.8, arch/arm/mm/proc-v7.S,
>> and modified to remove the logic to conditionally apply the WAR (since we
>> know exactly which CPU we're running on given the U-Boot configuration),
>> and use r0 instead of r10 for consistency with the rest of U-Boot's
>> cpu_init_cp15().
>
> Hmmm. Lets hold off on this series; there are some conditions under
> which the kernel has to be able to apply these WARs anyway (e.g. SMP CPU
> power saving), which may impact which of the WARs the bootloader should
> apply even when booting the initial CPU 0. I'll repost once that's been
> resolved.
Tom,
It looks like the bootloader should always apply these WARs for CPU 0.
We just have to make sure that the kernel applies them for CPUs 1..n
if/when running in secure mode.
In other words, I think these patches are good to go in as-is. Since
there are no changes to the patches, I won't repost them, unless you
need me to.
next prev parent reply other threads:[~2013-03-01 21:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-26 22:28 [U-Boot] [PATCH 1/3] ARM: implement some Cortex-A9 errata workarounds Stephen Warren
2013-02-26 22:28 ` [U-Boot] [PATCH 2/3] ARM: tegra: enable some CPU " Stephen Warren
2013-03-15 5:59 ` Albert ARIBAUD
2013-02-26 22:28 ` [U-Boot] [PATCH 3/3] ARM: mx6: use common CPU errata config options Stephen Warren
2013-02-27 0:15 ` Fabio Estevam
2013-02-27 2:44 ` Liu Hui-R64343
2013-03-07 17:24 ` Stefano Babic
2013-03-07 19:19 ` Stephen Warren
2013-03-08 8:12 ` Stefano Babic
2013-02-28 0:30 ` [U-Boot] [PATCH 1/3] ARM: implement some Cortex-A9 errata workarounds Simon Glass
2013-02-28 0:36 ` Stephen Warren
2013-02-28 0:38 ` Simon Glass
2013-02-28 17:08 ` Stephen Warren
2013-03-01 21:53 ` Stephen Warren [this message]
2013-03-01 23:02 ` Tom Warren
2013-03-04 16:30 ` Tom Warren
2013-03-04 18:00 ` Albert ARIBAUD
2013-03-04 19:07 ` Tom Warren
2013-03-15 5:58 ` Albert ARIBAUD
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