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[Qemu-devel] [Bug 604166] Re: QEMU Floating Point Exception and Crash wh
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [Bug 604166] Re: QEMU Floating Point Exception and Crash while Emulating "Cirrus Logic 5446 PCI" in Win98 |
Date: |
Sun, 20 Feb 2011 17:14:03 -0000 |
** Changed in: qemu
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/604166
Title:
QEMU Floating Point Exception and Crash while Emulating "Cirrus Logic
5446 PCI" in Win98
Status in QEMU:
Fix Released
Bug description:
My build of QEMU i386-softmmu crashes with a "floating point
exception" upon Win98SE startup when "Cirrus Logic 5446 PCI" display
adapter properties are set above 16 colors and/or 640 x 480".
My Setup:
I've been working to configure Windows 98 SE for video games in QEMU
(initially Grim Fandango and Masters of Orion 2, later Planescape
Torment and others) on a Mac OS X 10.6.4 host (gcc version 4.2.1). I
have reproduced this bug when building from both 0.12.50-trunk and
0.12.4-stable. My builds and installation are standard except that
they use the more recent SeaBIOS-6.0 binary as
$PREFIX/share/qemu/seabios.bin in order to work around the issue
described in Bug #521994. These are my current startup parameters:
> #! /bin/bash -
>
> GUESTNAME=win98-base.qemu
> VMHOME=/vol/$GUESTNAME
> RAMSIZE=512
> #DRIVES="$DRIVES -drive file=$VMHOME/fs/fda,if=floppy"
> DRIVES="$DRIVES -drive file=$VMHOME/fs/hdd.qcow2,if=ide,media=disk"
> #DRIVES="$DRIVES -drive
file=$VMHOME/ssw/win98se-oem.iso,if=ide,media=cdrom"
> BOOTDISK=c
>
> qemu\
> -M pc -cpu pentium3 -m $RAMSIZE\
> -vga cirrus -soundhw pcspk,es1370 -net nic,model=ne2k_pci\
> -localtime\
> -monitor stdio\
> -name $GUESTNAME\
> -boot $BOOTDISK\
> $DRIVES
The State of QEMU/Win98 Emulation:
The initial Windows 98 installation does not properly detect most PCI
devices (ie. es1370, ne2k_pci). There is a solution to this involving
a manual reinstallation of the device named "Plug and Play Bios (fail
safe)" with the win98 "PCI Bus" driver, as described here <http
://qemu-forum.ipi.fi/viewtopic.php?f=9&t=3072>. This process reveals
many previously undetected devices and is currently necessary for
win98 sound and networking support.
Unlike sound and network support, advanced graphics support is
available without the PCI Bus workaround via a display adapter
identified as "Cirrus Logic" in Device Manager. **This "Cirrus Logic"
adapter does support higher resolutions and color depth, but does not
work properly in some applications.** For instance, when running the
intro to Grim Fandango, many colors are shown incorrectly and the
system slows and freezes. One of the devices revealed and installed
after the PCI Bus workaround is the "Cirrus Logic 5446 PCI" display
adapter, and I had hoped that configuring this device might solve
these problems.
The Bug:
Device Manager lists "Cirrus Logic 5446 PCI" alongside the previously
discovered "Cirrus Logic" device, but due to resource conflicts,
"Cirrus Logic 5446 PCI" is effectively disabled until "Cirrus Logic"
is either disabled or uninstalled. Unfortunately, disabling "Cirrus
Logic" and using "Cirrus Logic 5446 PCI" only makes things worse, for
using any display settings higher than 16 colors and 640x480 will
always cause a floating point exception on startup. This crash occurs
after the login prompt and during the Windows 98 startup chime.
I hope that someone will be able to make sense of all of this.
Until then,
D. Johnston
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