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Date: Tue, 23 Oct 2012 09:31:15 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Resource reporting for VGA cards
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To: =?ISO-8859-1?Q?Herv=E9_Poussineau?= <hpoussin@reactos.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>

On 10/22/12 21:43, Herv=E9 Poussineau wrote:
> Hello,
>=20
> 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 ther=
e
> is no display at all; I think it is due to bad framebuffer address
> detection.

I'd tend to suspect vgabios issues.

> 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 (???)

Can you try lspci in a linux guest?
Do you have a git tree somewhere?

> S3 card have a BAR0 of size 0x1000000 (16MB) for the framebuffer, and
> ROM is created with bochs vgabios.

I'd use seabios instead, but bochs vga should work too.  Of course the
PCI IDs must be correct otherwise seabios ignores the rom.

> QEMU is launched with -m pc -device s3-trio.

/me suggests to add '-vga none' so you don't end up with both cirrus & s3

cheers,
  Gerd