New USB 2.0/Firewire card b0rked system

I'm a n00b and am playing around with Solaris 10.0. Had things working
well until I installed a new firewire/USB 2.0 card. When I boot up I
get a lot of the following:

usba: WARNING 1pci@0,0/pci925,1234@11,2(uhci0): no SOF interrupt has
been received. This UHCI host controller is unusable.

I am able to log in as root, but a lot of commands don't work and I
suspect that there are no mounted filesystems. It might be possible to
install a driver, but I doubt that I could mount the installation
medium. I haven't been able to find drivers anyway. Here is the
output from the relevant lines from "lspci" (Linux):

00:0b.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 63)
00:0b.3 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)
00:0b.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 63)
00:0b.3 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)

In case it is useful, here is the entire output of lspci:

00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo
KT266/A/333]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo
KT266/A/333 AGP]
00:09.0 Communication controller: Agere Systems LT WinModem (rev 02)
00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
00:0b.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:0b.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:0b.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 63)
00:0b.3 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:11.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 23)
00:11.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 23)
00:11.5 Multimedia audio controller: VIA Technologies, Inc.
VT8233/A/8235/8237 AC97 Audio Controller (rev 40)
00:14.0 Multimedia audio controller: VIA Technologies Inc. ICE1712
[Envy24] PCI Multi-Channel I/O Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2
MX/MX 400] (rev b2)
00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo
KT266/A/333]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo
KT266/A/333 AGP]
00:09.0 Communication controller: Agere Systems LT WinModem (rev 02)
00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
00:0b.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:0b.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:0b.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 63)
00:0b.3 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:11.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 23)
00:11.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 23)
00:11.5 Multimedia audio controller: VIA Technologies, Inc.
VT8233/A/8235/8237 AC97 Audio Controller (rev 40)
00:14.0 Multimedia audio controller: VIA Technologies Inc. ICE1712
[Envy24] PCI Multi-Channel I/O Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2
MX/MX 400] (rev b2)

Can anybody help? If it can't be fixed easily, is it possible to
disable this card temporarily to get things working again?

.