Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752179AbaBJOy0 (ORCPT ); Mon, 10 Feb 2014 09:54:26 -0500 Received: from ducie-dc1.codethink.co.uk ([37.128.190.40]:34222 "EHLO ducie-dc1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751371AbaBJOyZ (ORCPT ); Mon, 10 Feb 2014 09:54:25 -0500 Message-ID: <52F8E81E.70804@codethink.co.uk> Date: Mon, 10 Feb 2014 14:54:22 +0000 From: Ben Dooks Organization: Codethink Limited. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131103 Icedove/17.0.10 MIME-Version: 1.0 To: Dave Martin CC: Fabrice GASNIER , linux@arm.linux.org.uk, u.kleine-koenig@pengutronix.de, jonathan.austin@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, nico@linaro.org, sboyd@codeaurora.org, marc.zyngier@arm.com, vgupta@synopsys.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, maxime.coquelin@st.com Subject: Re: [RFC PATCH] ARM: Add imprecise abort enable/disable macro References: <1391789955-26927-1-git-send-email-fabrice.gasnier@st.com> <1391789955-26927-2-git-send-email-fabrice.gasnier@st.com> <20140210141634.GA2794@e103592.cambridge.arm.com> In-Reply-To: <20140210141634.GA2794@e103592.cambridge.arm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/02/14 14:16, Dave Martin wrote: > On Fri, Feb 07, 2014 at 05:19:15PM +0100, Fabrice GASNIER wrote: >> This patch adds imprecise abort enable/disable macros. >> It also enables imprecise aborts when starting kernel. > > Relying on imprecise aborts for hardware probing would be considered bad > hardware and/or software design for ARM-specific stuff. > > PCI is more generic though, so we may have to put up with this to some > extent. Can you point me to the affected probing code? I'm not very > familiar with that stuff... The marvell pcie always had the option of delivering any bus errors as imprecise aborts. However it was /annoying/ and therefore easier just to turn it off and rely on the hardware returning 0xffff for any configuration area it couldn't get to. -- Ben Dooks http://www.codethink.co.uk/ Senior Engineer Codethink - Providing Genius -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/