From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King - ARM Linux Subject: Re: [PATCH v1] ARM: decompressor: reset ttbcr fields to use TTBR0 on ARMv7 Date: Wed, 28 Sep 2016 23:00:32 +0100 Message-ID: <20160928220032.GN1041@n2100.armlinux.org.uk> References: <3441d0c3-c4b6-a795-a841-b61a8866ce17@arm.com> <1475066728-27290-1-git-send-email-sramana@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from pandora.armlinux.org.uk ([78.32.30.218]:49378 "EHLO pandora.armlinux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754357AbcI1WAt (ORCPT ); Wed, 28 Sep 2016 18:00:49 -0400 Content-Disposition: inline In-Reply-To: <1475066728-27290-1-git-send-email-sramana@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: Srinivas Ramana Cc: nicolas.pitre@linaro.org, will.deacon@arm.com, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org 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 > Signed-off-by: Srinivas Ramana Please submit to the patch system, thanks. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.