WDMA mode won't enable? Old machine...

[Mark Cullen]

I have a rather old machine acting as a home server. According to dmesg 
it has a:

--
atapci0: <Intel PIIX WDMA2 controller> port 
0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 7.1 on pci0
--

However, both hard disks attached are running in PIO mode.

--
ad0: 4103MB <ST34321A> [8894/15/63] at ata0-master BIOSPIO
ad2: 6194MB <IBM-DADA-26480> [13424/15/63] at ata1-master BIOSPIO
--

I tried running the following, but as you can see the end result is that 
they are still running BIOSPIO.

--
(root|bone)/home/mrboo# atacontrol mode 0 WDMA2 WDMA2
Master = BIOSPIO
Slave  = BIOSPIO
--

Any suggestions as to how I might enable some sort of DMA on these 
drives? Since the machine is rather slow (133MHz) and it's currently 
using polled IO I am sure it will likely benefit me, even if it isn't 
quite UDMA :)

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