From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42526) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZBFzq-0006mu-Pk for qemu-devel@nongnu.org; Sat, 04 Jul 2015 01:28:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZBFzl-0000dT-QJ for qemu-devel@nongnu.org; Sat, 04 Jul 2015 01:28:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57792) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZBFzl-0000dH-Li for qemu-devel@nongnu.org; Sat, 04 Jul 2015 01:28:09 -0400 Message-ID: <55976EE6.1050709@redhat.com> Date: Sat, 04 Jul 2015 01:28:06 -0400 From: John Snow MIME-Version: 1.0 References: <5596990C.5090204@suse.de> In-Reply-To: <5596990C.5090204@suse.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] SATA CD-ROM booting failure with latest OVMF List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Hannes Reinecke Cc: "qemu-devel@nongnu.org" , Alexander Graf On 07/03/2015 10:15 AM, Hannes Reinecke wrote: > > After some _very_ tedious debugging I've found this to be an issue > with the ahci driver in qemu; ATAPI PIO transfers seem to be > slightly buggy. Enabling 'atapi_dma' transfers in atapi driver (even > for PIO mode) makes everything work again. PIO again! Alright, fun. Try a git bisect, except cheat and try before and after 1cbdd96813474de4191b0b37b859a5460373093b -- That's my wild guess. Will check it out Monday, otherwise. Thanks, --John