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Date: Tue, 23 Oct 2012 23:04:41 +0200
From: =?ISO-8859-1?Q?Herv=E9_Poussineau?= <hpoussin@reactos.org>
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Subject: Re: [Qemu-devel] Resource reporting for VGA cards
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>

Hi,
Gerd Hoffmann a =E9crit :
> On 10/22/12 21:43, Herv=E9 Poussineau wrote:
>> Hello,
>>
>> I'm trying to add support for a S3 PCI VGA card to QEMU. It currently
>> works on some non-x86 systems.
>> However, on x86, it seems that the card is correctly detected, but the=
re
>> is no display at all; I think it is due to bad framebuffer address
>> detection.
>=20
> I'd tend to suspect vgabios issues.
>=20
>> QEMU:
>>    Memory: 000A0000-000AFFFF
>>    Memory: 000B0000-000BFFFF
>>    I/O: 03B0-03BB
>>    I/O: 03C0-03DF
>>    Memory: FD000000-FDFFFFFF (BAR0)
>>    Memory: 000C0000-000CFFFF (rom file?)
>>    Memory: 04000000-04007FFF (???)
>=20
> Can you try lspci in a linux guest?
> Do you have a git tree somewhere?

Git tree is available at git://repo.or.cz/qemu/hpoussin.git branch s3.
Sorry, I don't have handy a lspci output, I will try to provide you one=20
later.

>> S3 card have a BAR0 of size 0x1000000 (16MB) for the framebuffer, and
>> ROM is created with bochs vgabios.
>=20
> I'd use seabios instead, but bochs vga should work too.  Of course the
> PCI IDs must be correct otherwise seabios ignores the rom.
>=20
>> QEMU is launched with -m pc -device s3-trio.
>=20
> /me suggests to add '-vga none' so you don't end up with both cirrus & =
s3

OK, tested with -vga none -device s3-trio, and I also tried with seavgabi=
os.

With seavgabios, BIOS is displayed, Windows starts to load, and then=20
Windows 98 seems to stop loading at animated screen during load.

With bochs vgabios, Windows 98 loads with fail-safe display driver,=20
saying that the device doesn't work.

Herv=E9