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From: =?ISO-8859-1?Q?Herv=E9_Poussineau?= <hpoussin@reactos.org>
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Subject: [Qemu-devel] Resource reporting for VGA cards
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To: QEMU Developers <qemu-devel@nongnu.org>

Hello,

I'm trying to add support for a S3 PCI VGA card to QEMU. It currently=20
works on some non-x86 systems.
However, on x86, it seems that the card is correctly detected, but there=20
is no display at all; I think it is due to bad framebuffer address=20
detection.
There is some resource differences beteween QEMU vs Microsoft Virtual PC.

Resources reported by MS Windows 98 are:

Microsoft Virtual PC:
    Memory: 000A0000-000AFFFF
    Memory: 000B0000-000BFFFF
    I/O: 03B0-03BB
    I/O: 03C0-03DF
    Memory: F8000000-FBFFFFFF (I think it is the framebuffer)

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 (???)

S3 card have a BAR0 of size 0x1000000 (16MB) for the framebuffer, and=20
ROM is created with bochs vgabios.
QEMU is launched with -m pc -device s3-trio.

Do you have an idea of what can be the last entry, and how to remove it=20
from resource detection?
And why MS Virtual PC doesn't report ROM file, while QEMU does?

Regards,

Herv=E9