From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 02 Feb 2006 18:38:21 +0000 (GMT) Received: from rtsoft2.corbina.net ([85.21.88.2]:6335 "HELO mail.dev.rtsoft.ru") by ftp.linux-mips.org with SMTP id S3465652AbWBBSh6 (ORCPT ); Thu, 2 Feb 2006 18:37:58 +0000 Received: (qmail 22599 invoked from network); 2 Feb 2006 18:43:09 -0000 Received: from wasted.dev.rtsoft.ru (HELO ?192.168.1.248?) (192.168.1.248) by mail.dev.rtsoft.ru with SMTP; 2 Feb 2006 18:43:09 -0000 Message-ID: <43E25381.4060309@ru.mvista.com> Date: Thu, 02 Feb 2006 21:46:25 +0300 From: Sergei Shtylylov Organization: MontaVista Software Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803 X-Accept-Language: ru, en-us, en-gb MIME-Version: 1.0 To: Atsushi Nemoto CC: linux-mips@linux-mips.org, ralf@linux-mips.org Subject: Re: [PATCH] TX49 MFC0 bug workaround References: <20060203.013401.41198517.anemo@mba.ocn.ne.jp> In-Reply-To: <20060203.013401.41198517.anemo@mba.ocn.ne.jp> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 10314 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: sshtylyov@ru.mvista.com Precedence: bulk X-list: linux-mips Hello. Atsushi Nemoto wrote: > If mfc0 $12 follows store and the mfc0 is last instruction of a > page and fetching the next instruction causes TLB miss, the result > of the mfc0 might wrongly contain EXL bit. Hmm, a TLB miss in fetching from KSEG0?! > ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008 > > Workaround: mask EXL bit of the result or place a nop before mfc0. Is this workaround really needed? > Signed-off-by: Atsushi Nemoto WBR, Sergei