From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NA70T-0005kG-DP for qemu-devel@nongnu.org; Mon, 16 Nov 2009 14:12:57 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NA70O-0005gf-J9 for qemu-devel@nongnu.org; Mon, 16 Nov 2009 14:12:56 -0500 Received: from [199.232.76.173] (port=54224 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NA70O-0005gY-6u for qemu-devel@nongnu.org; Mon, 16 Nov 2009 14:12:52 -0500 Received: from mail-qy0-f194.google.com ([209.85.221.194]:55801) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1NA70N-0006yw-Cl for qemu-devel@nongnu.org; Mon, 16 Nov 2009 14:12:51 -0500 Received: by qyk32 with SMTP id 32so2534190qyk.4 for ; Mon, 16 Nov 2009 11:12:50 -0800 (PST) Message-ID: <4B01A430.1080107@codemonkey.ws> Date: Mon, 16 Nov 2009 13:12:48 -0600 From: Anthony Liguori MIME-Version: 1.0 Subject: Re: [Qemu-devel] Standard vga breakage References: <20091115152858.GH7392@redhat.com> <4B0061B2.2070207@mail.berlios.de> In-Reply-To: <4B0061B2.2070207@mail.berlios.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Weil Cc: Blue Swirl , qemu-devel , Gleb Natapov Stefan Weil wrote: > malc schrieb: > >> On Sun, 15 Nov 2009, Gleb Natapov wrote: >> >> >>> On Sun, Nov 15, 2009 at 06:22:40PM +0300, malc wrote: >>> >>>> On Sun, 15 Nov 2009, Blue Swirl wrote: >>>> >>>> >>>>> On Sun, Nov 15, 2009 at 3:25 AM, malc wrote: >>>>> >>>>>> debian-503-i386-netinst.iso when booted on a machine with `-vga >>>>>> std' just >>>>>> shows black screen (after bios' setup screen) >>>>>> >>>>> Just some observations: >>>>> - if you press enter, installer starts and Linux is able to fix the >>>>> display >>>>> - the screen is fine with -bios pcbios.bin, so the issue is related >>>>> to SeaBIOS >>>>> >>>> Yes i forgot to mention that -bios works, also worth noting is that >>>> before >>>> the commit that fixed cirrus -bios hack also made it work. >>>> > > > Here is a summary of my analysis of this problem: > > Graphics mode memory (ram 0xe0000000 ...) is not mapped > in QEMU address space (which results in unassigned > memory writes) for standard pci vga (-vga std), so users > don't get vga display output with grub (in graphical mode), > debian installer (in graphical mode) or similar boot software. > 0xe00... is the VBE mapping. The VGABIOS assumes this mapping exists when using VBE. Cirrus doesn't support VBE so it wouldn't be exposed there. Does the following help: diff --git a/hw/vga-pci.c b/hw/vga-pci.c index 479ffb1..e273b8b 100644 --- a/hw/vga-pci.c +++ b/hw/vga-pci.c @@ -107,6 +107,12 @@ static int pci_vga_initfn(PCIDevice *dev) PCI_BASE_ADDRESS_MEM_PREFETCH, vga_map); } +#ifdef CONFIG_BOCHS_VBE + /* XXX: use optimized standard vga accesses */ + cpu_register_physical_memory(VBE_DISPI_LFB_PHYSICAL_ADDRESS, + vga_ram_size, s->vga.vram_offset); +#endif + /* ROM BIOS */ rom_add_vga(VGABIOS_FILENAME); return 0; Regards, Anthony Liguori