ATA broken

With lastest kernel source code, I can no longer boot
into workable state:

ad0: WRITE command timeout tag=0 serv=0 -resetting
ata0: resetting devices ..
done
ad0: WRITE command timeout tag=0 serv=0 -resetting
ata0: resetting devices ..

then dead.

Here is the motherboard specification,
http://www.tyan.com/products/html/tiger230t.html

David Xu