From: swarren@wwwdotorg.org (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: tegra: don't unlock MMIO access to DBGLAR
Date: Wed, 06 Mar 2013 13:42:21 -0700 [thread overview]
Message-ID: <5137AA2D.6000401@wwwdotorg.org> (raw)
In-Reply-To: <1361268973-14584-1-git-send-email-josephl@nvidia.com>
On 02/19/2013 03:16 AM, Joseph Lo wrote:
> There is no need to unlock MMIO access to the DBGLAR all the time. Doing
> so may even cause problems if a SW bug causes writes to that MMIO region.
>
> Cortex-A15 processors do not support the CP14 register write the code
> currently uses to unlock the DBGLAR; the instruction throws an undefined
> instruction exceptions. This prevents tegra_secondary_startup() from
> executing on Tegra114, and hence prevents SMP.
>
> Remove the code that unlocks this access.
I have applied this to Tegra's for-3.10/fixes branch.
prev parent reply other threads:[~2013-03-06 20:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 10:16 [PATCH] ARM: tegra: don't unlock MMIO access to DBGLAR Joseph Lo
2013-03-06 20:42 ` Stephen Warren [this message]
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