From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753020AbdENMuS (ORCPT ); Sun, 14 May 2017 08:50:18 -0400 Received: from mx2.suse.de ([195.135.220.15]:51911 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751931AbdENMuR (ORCPT ); Sun, 14 May 2017 08:50:17 -0400 Subject: Re: [PATCH V2] ARM: dts: bcm283x: Reserve first page for firmware To: Phil Elwell , linux-rpi-kernel@lists.infradead.org References: Cc: Rob Herring , Mark Rutland , Russell King , Florian Fainelli , bcm-kernel-feedback-list@broadcom.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Stefan Wahren , Eric Anholt From: =?UTF-8?Q?Andreas_F=c3=a4rber?= Organization: SUSE Linux GmbH Message-ID: Date: Sun, 14 May 2017 14:50:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 09.05.2017 um 11:04 schrieb Phil Elwell: > The Raspberry Pi startup stub files for multi-core BCM27XX processors Curiously, while this V2 was rebased to apply against the bcm283x rather than bcm2710 file, it changed the text from BCM283X to BCM27XX. > make the secondary CPUs spin until the corresponding mailbox is > written. These stubs are loaded at physical address 0x00000xxx (as seen > by the ARMs), but this page will be reused by the kernel unless it is > explicitly reserved, causing the waiting cores to execute random code. > > Use the /memreserve/ Device Tree directive to mark the first page as > off-limits to the kernel. > > See: https://github.com/raspberrypi/linux/issues/1989 > > Signed-off-by: Phil Elwell > --- > > Changes in V2: > - Rebase against linux-next > - Drop downstream-only patch > > arch/arm/boot/dts/bcm283x.dtsi | 2 ++ > 1 file changed, 2 insertions(+) Regards, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg)