Those have the 20268 chip, right?
> Any 2.4 kernel I have tried on this machine displays this strange
> behavior: any drives attached to the PDC controllers only work at udma
> mode 2 (UDMA33).
I've recently installed a Ultra133 TX2 (PDC 20269) in a box, and it
also only does UDMA33 in 2.4.20-pre11. 2.5.44 with the PDC driver
for "new" chips does UDMA100, however. (The disk is only UDMA100.)
The latest 2.4.20-pre-ac is supposed to have new IDE drivers, but
I haven't had time to test it myself.
> So I have come to the conclusion there must be some rather bizarre
> incompatibility between the PDCs and this motherboard.
Unlikely.
> Let me note that the PDC controllers do work just fine with other older
> motherboards. And another thing, during boot-up, the PDCs do show the
> drives attached to it, detected at the right udma mode.
Did those boards also use standard 2.4 kernels?
/Mikael
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