motherboard?

[nullpointer at pobox.com (Dan Barrett)]

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... add /proc/ide/piix to that list of possibly-helpful files (the first line 
of output might be of use): 

$ cat piix

                                Intel PIIX4 Ultra 100 Chipset.
- --------------- Primary Channel ---------------- Secondary Channel 
- -------------
                 enabled                          enabled
- --------------- drive0 --------- drive1 -------- drive0 ---------- drive1 
- ------
DMA enabled:    yes              no              yes               no
UDMA enabled:   yes              no              yes               no
UDMA enabled:   5                X               4                 X
UDMA
DMA
PIO
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=U1t0
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