From mboxrd@z Thu Jan 1 00:00:00 1970 From: Doug Maxey Subject: Re: libata machine check on Alpha Date: Thu, 06 Apr 2006 01:44:00 -0500 Message-ID: <200604060644.k366i0O6007713@falcon30.maxeymade.com> References: <2E9B8131C44AF746B1E06BF9B15A434B045D8198@mail.siliconimage.com> <44347713.9000408@tw.ibm.com> <44347A3D.1000609@garzik.org> <44347D9E.8080107@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from falcon30.maxeymade.com ([24.173.215.190]:9144 "EHLO falcon30.maxeymade.com") by vger.kernel.org with ESMTP id S1750963AbWDFGov convert rfc822-to-8bit (ORCPT ); Thu, 6 Apr 2006 02:44:51 -0400 In-reply-to: <4434B76F.7020206@tw.ibm.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Albert Lee Cc: Tejun Heo , Jeff Garzik , albertl@mail.com, Carlos Pardo , Jonathan Blake Benson , linux-ide@vger.kernel.org On Thu, 06 Apr 2006 14:38:39 +0800, Albert Lee wrote: >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 = bit >>>> 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 = is >> supposed to mangle the IDENTIFY PACKET DEVICE result. It's supposed= to >> nuke all DMA transfer mode information reported from the original de= vice >> 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 th= ink >> 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. Do we have any devices to test your patch with? Perhaps in Rochester? ++doug