From mboxrd@z Thu Jan 1 00:00:00 1970 From: Albert Lee Subject: Re: libata machine check on Alpha Date: Thu, 06 Apr 2006 14:38:39 +0800 Message-ID: <4434B76F.7020206@tw.ibm.com> References: <2E9B8131C44AF746B1E06BF9B15A434B045D8198@mail.siliconimage.com> <44347713.9000408@tw.ibm.com> <44347A3D.1000609@garzik.org> <44347D9E.8080107@gmail.com> Reply-To: albertl@mail.com Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from e35.co.us.ibm.com ([32.97.110.153]:8843 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S1751136AbWDFGjF (ORCPT ); Thu, 6 Apr 2006 02:39:05 -0400 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e35.co.us.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id k366cxUE001958 for ; Thu, 6 Apr 2006 02:38:59 -0400 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VER6.8) with ESMTP id k366ZcOS250676 for ; Thu, 6 Apr 2006 00:35:38 -0600 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.12.11/8.13.3) with ESMTP id k366cw4A025116 for ; Thu, 6 Apr 2006 00:38:59 -0600 In-Reply-To: <44347D9E.8080107@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Jeff Garzik , albertl@mail.com, Carlos Pardo , Jonathan Blake Benson , linux-ide@vger.kernel.org Tejun Heo wrote: > Jeff Garzik wrote: >=20 >> Albert Lee wrote: >> >>> Per Jeff's comment, there is a document on t13 >>> (http://www.t13.org/docs2003/e03131r0.pdf). >>> The documents reads: >>> "Eg. =96 Word 50, bit 13: Set to 1 for devices that support DMAIN b= it >>> in Features Register for Packet Command". >>> However, this looks more for the ATAPI device than for the bridge? >>> Also it looks not a t13 standard yet? >>> Can we use this word 50 to identify 3611/3811? >> >> >> >> DMADIR is in my copy of ATA-7... >> >=20 > Here's the relavant part from ATA8 draft. It seems that the bridge i= s > supposed to mangle the IDENTIFY PACKET DEVICE result. It's supposed = to > nuke all DMA transfer mode information reported from the original dev= ice > and report supported modes from the view point of the bridge in bits > 10:1 (which, BTW, should be all 1's). >=20 > The question is whether or not bridges implement this properly. I thi= nk > we can add a printk to word 62 and ask Jonathan to test it. >=20 Ah, thanks for the info. The DMADIR is in my copy ATA-7, too. I just checked word 50 and overlooked it. :( I should have checked other part of the spec... Anyway, will try to make a patch based on the ATA-7 spec. -- Albert