Is there a fix for this that ought to be pulled up for 1.5.1?
(Ultra10)

ATI Technologies Mach64 GT (VGA display, revision 0x9a) at pci2 dev 2 function
0 not configured
pciide0 at pci2 dev 3 function 0: CMD Technology PCI0646 (rev. 0x03)
pciide0: bus-master DMA support present
pciide0: primary channel configured to native-PCI mode
pciide0: using vector 32 for native-PCI interrupt
data fault: pc=12315ec addr=28 sfsr=%qb
kernel trap 30: data access exception
Stopped in swapper at   pciide_mapregs_native+0x1f8:    ldx             [%o2 +
0
x28], %o0