linux-kernel - Re: [PATCH v1] ARM: decompressor: reset ttbcr fields to use TTBR0 on ARMv7

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Message-ID: <20160928220032.GN1041@n2100.armlinux.org.uk>
Date:   Wed, 28 Sep 2016 23:00:32 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Srinivas Ramana <sramana@...eaurora.org>
Cc:     nicolas.pitre@...aro.org, will.deacon@....com,
        robin.murphy@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v1] ARM: decompressor: reset ttbcr fields to use TTBR0 on
 ARMv7

On Wed, Sep 28, 2016 at 06:15:28PM +0530, Srinivas Ramana wrote:
> If the bootloader uses the long descriptor format and jumps to
> kernel decompressor code, TTBCR may not be in a right state.
> Before enabling the MMU, it is required to clear the TTBCR.PD0
> field to use TTBR0 for translation table walks.
> 
> The commit dbece45894d3a ("ARM: 7501/1: decompressor:
> reset ttbcr for VMSA ARMv7 cores") does the reset of TTBCR.N, but
> doesn't consider all the bits for the size of TTBCR.N.
> 
> Clear TTBCR.PD0 field and reset all the three bits of TTBCR.N to
> indicate the use of TTBR0 and the correct base address width.
> 
> Fixes: dbece45894d3 ("ARM: 7501/1: decompressor: reset ttbcr for VMSA ARMv7 cores")
> Acked-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Srinivas Ramana <sramana@...eaurora.org>

Please submit to the patch system, thanks.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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