From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56033) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YcWM2-0003Dh-56 for qemu-devel@nongnu.org; Mon, 30 Mar 2015 05:51:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YcWLx-0007n4-NQ for qemu-devel@nongnu.org; Mon, 30 Mar 2015 05:51:34 -0400 Sender: Paolo Bonzini Message-ID: <55191C97.8070308@redhat.com> Date: Mon, 30 Mar 2015 11:51:19 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <5516FEDE.3030809@ilande.co.uk> In-Reply-To: <5516FEDE.3030809@ilande.co.uk> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] ppc vga output breakage since commit c3c1bb99 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Mark Cave-Ayland , BALATON Zoltan , qemu-devel@nongnu.org Cc: Peter Crosthwaite , qemu-ppc@nongnu.org On 28/03/2015 20:19, Mark Cave-Ayland wrote: > On 28/03/15 19:04, BALATON Zoltan wrote: > >> Hello, >> >> Commit c3c1bb99d1c11978d9ce94d1bdcf0705378c1459 (exec: Respect >> as_tranlsate_internal length clamp) seems to break vga output with >> qemu-system-ppc on x86_64 host. Since this commit, the output window >> does not get to the OpenBIOS console but stays black. (Easy to reproduce >> by just starting qemu-system-ppc.) >> >> The reason may be that this change has exposed another bug somewhere >> else but this is all quite obscure to me. Does anyone have any idea what >> could be wrong or where to look further. Any help is appreciated. > > Hi Zoltan, > > Yes indeed, this has been picked up in the last few days and is on the > list of issues to be dealt with for -rc2. So watch this space... This is an OpenBIOS bug; the port at 0x1ce is 1 byte wide, but OpenBIOS is accessing it as 2 bytes. Of course, there's a QEMU regression too and I'm thinking of how to fix it. Paolo