Re: ASUS TUSL2-C and Promise Ultra100 TX2

[Mikael Pettersson]

Cajoline writes:
 > I recently setup a box with the following components:
 > Intel Celeron 1300 MHz
 > ASUS TUSL2-C motherboard
 > 2 x Promise Ultra100 TX2 controllers

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