From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: libata pata_pdc2027x success on sparc64 Date: Tue, 18 Jul 2006 22:07:44 +0400 Message-ID: <44BD2370.8090506@ru.mvista.com> References: <200607172358.k6HNwYhF002052@harpo.it.uu.se> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200607172358.k6HNwYhF002052@harpo.it.uu.se> Sender: linux-kernel-owner@vger.kernel.org To: Mikael Pettersson Cc: albertcc@tw.ibm.com, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, alan@redhat.com List-Id: linux-ide@vger.kernel.org Hello. Mikael Pettersson wrote: > In contrast, the old IDE pdc202xx_new driver had lots > of problems with CRC errors causing it to disable DMA. Hm, from my experience it usually falls back to UltraDMA/44 and then the thing startrt working... > I wasn't able to manually tune it above udma3 without > getting more errors. This isn't sparc64-specific: I've > had similar negative experience with the old IDE Promise > drivers in a PowerMac. This happens because the "old" driver misses the PLL calibration code. You may want to try these Albert's patches: http://marc.theaimsgroup.com/?t=110992452800002&r=1&w=2 http://marc.theaimsgroup.com/?t=110992471500002&r=1&w=2 http://marc.theaimsgroup.com/?t=110992490100002&r=1&w=2 http://marc.theaimsgroup.com/?t=111019238400003&r=1&w=2 It looks like they were never considered for accepting into the kernel while they succesfully solve this issue. Maybe Albert could try pushing them into -mm tree once more? WBR, Sergei