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FWIW, I have a microATX mainboard (MSI RS480M2-IL aka MS-7093) with the
RS480 chipset on it. Details:
It currently runs FreeBSD 5.4-stable (amd64):
tingo@kg-quiet$ uname -a
FreeBSD kg-quiet.kg4.no 5.4-STABLE FreeBSD 5.4-STABLE #3: Tue May 10
22:30:29 CEST 2005 XXXX@XXXXX.COM :/usr/obj/usr/src/sys/QUIET
I did try to boot 5.3-release / i386 on it, but it had the same problems
as the amd64 version.
I had to disable the apic with hint.apic.0.disabled="1" in
/boot/loader.conf in order to get the machine to boot.
Xorg (Xorg-server-snap) works with the vesa driver, in 1024x768. In
1280x1024 it does not. The radeon driver doesn't work at all.
I have filed these bugs for it:
usb ports doesn't work, sound doesn't work (it's an ALC658C so it should
work). Network works.
dmesg output attached.