NB3 ALi1543C IDE DMA transfer error

I picked out dusty CATS board and managed to be successful in booting
current kernel.  I found the followings difficulties;

- Cyclone1.2 bootloader can not TFTP boot neither of 2.1 nor 3.0
aout-INSTALL image.  Kernel size looks to exceed the functional limit.
- After upgrading the Cyclone1.3, NB3 aout-INSTALL is useful enough
to proceed sysinst.  Booting netbsd-GENERIC is still not possible.  I needed
to build trim-down kernel (3+MB).

The issue I'm now experiencing ALi 1543C IDE.  The transfer mode is
always downgraded into PIO4.  I remember that 1.6.2 kernel better
handled the IDE mode.  Does anyone out there have the same symptom
and hopefully have the solution?

Toru Nishimura/ALKYL Technology

wd0(aceride0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
boot device: wd0
root on wd0a dumps on wd0b
wd0: transfer error, downgrading to Ultra-DMA mode 1
wd0(aceride0:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA)
wd0a: DMA error reading fsbn 16 of 16-31 (wd0 bn 16; cn 0 tn 0 sn 16), retrying
wd0: soft error (corrected)
root file system type: ffs
inittodr: 11:22:05.0000 11/02/2006
Clock has gained 0 days 0 hours 1 minutes 43 secs
wd0: transfer error, downgrading to PIO mode 4
wd0(aceride0:0:0): using PIO mode 4
wd0a: error reading fsbn 6762624 of 6762624-6762639 (wd0 bn 6762624; cn 6708 tn 15 sn 15), retrying
wd0: (aborted command, interface CRC error)
wd0: soft error (corrected)
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