So, as the title says, I've got a 440BX board and it's not making it to UDMA2/33.

Now, the thing is, it's not the usual Award 4.5x issue, where it won't come out of PIO into UDMA at all. Both XHDD in DOS and windows itself will happily put it into UDMA1/25, which I've confirmed with HDAT2 and various benchmarks. Read/write speeds are about where they should be.

The drive's quite capable of it (SSD on a Startech Sata>IDE adapter) and I've tested it on a whole other ide controller and it'll happily go into UDMA4/66, on a controller capable of it, so no issue from that end. Again, benches right when hooked up to a faster controller. The drive's hooked-up using an 80-pin cable, although I've tried with a plain 40-pin one (no difference).

Using HDAT2 to command the drive to go into UDMA2 mode says "error".

Any suggestions? I know there's a configuration register on the 440BX's controller related to UDMA2/33 mode, but I'm not 100% sure how to do that or of it's even the right thing to be doing.