UDMA in kernel 2.4.21

[Alexey Chetroi <debian@lexa.uniflux-line.net>]

 Hello,

 I've compiled kernel 2.4.21 from unstable, but when I'm trying 
to setup UDMA mode X67-X69, kernel complains that udma 3/4/5 not
functional and indeed hdparm -tT /dev/hda shows performance degrade.
But kernel version 2.4.20 on the same machine works perfectly with
UDMA. What could be the problem? 

-- 
Alexei Chetroi