From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757489AbdDRP5d (ORCPT ); Tue, 18 Apr 2017 11:57:33 -0400 Received: from foss.arm.com ([217.140.101.70]:58448 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757405AbdDRP5a (ORCPT ); Tue, 18 Apr 2017 11:57:30 -0400 Date: Tue, 18 Apr 2017 16:57:25 +0100 From: Catalin Marinas To: Russell King - ARM Linux Cc: Nisal Menuka , vladimir.murzin@arm.com, linux-kernel@vger.kernel.org, dianders@chromium.org, kever.yang@rock-chips.com, armlinux@m.disordat.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] Remove ARM errata Workarounds 458693 and 460075 Message-ID: <20170418155725.GG27592@e104818-lin.cambridge.arm.com> References: <1492301166-10292-1-git-send-email-nisalmenuka23@gmail.com> <20170416080446.GI17774@n2100.armlinux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170416080446.GI17774@n2100.armlinux.org.uk> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Apr 16, 2017 at 09:04:46AM +0100, Russell King - ARM Linux wrote: > On Sat, Apr 15, 2017 at 07:06:06PM -0500, Nisal Menuka wrote: > > According to ARM, these errata exist only in a version of Cortex-A8 > > (r2p0) which was never built. Therefore, I believe there are no platforms > > where this workaround should be enabled. > > link :http://infocenter.arm.com/help/index.jsp?topic= > > /com.arm.doc.faqs/ka15634.html > > These were submitted by ARM Ltd back in 2009 - if the silicon was never > built, there would've been no reason to submit them. Maybe Catalin can > shed some light on this, being the commit author who introduced these? We normally try not to submit errata workarounds for revisions that are not going to be built/deployed. It's possible that at the time there were plans for r2p0 to be licensed and built (not just FPGA) but I don't really remember the details. The A8 errata document indeed states that r1p0 and r2p0 are obsolete but this can mean many things (like not available to license). I'll try to see if any of the A8 past product managers know anything about this. In the meantime, I would leave them in (no run-time overhead). -- Catalin