Enable DMA on SATA drive?

[merc]

I just installed Hoary64 on my AMD64 machine. Here are the specs:

AMD Athlon64 3000+
K8T800 Motherboard with 8237 southbridge (native SATA)

My drives are setup as follows:

IDE Channel 0: DVD
IDE Channel 1: 10gb Seagate PATA drive
SATA Channel 0: 80gb Seagate SATA drive

The problem is that I can't enable DMA on the SATA drive. It mounts under /dev/sda, and here's where the weirdness begins:

merc@blackbox:~$ sudo hdparm -i /dev/sda

/dev/sda:

 Model=ST380013AS      3.18, FwRev=3.18, SerialNo=
 Config={ }
 RawCHS=9729/255/63, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=9729/255/63, CurSects=0, LBA=no
 IORDY=no
 PIO modes:  pio0
 AdvancedPM=no

 * signifies the current active mode

And by contrast, this is what I get for the IDE drive:

/dev/hda:

 Model=ST310014A, FwRev=3.09, SerialNo=5JREKJA7
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=20005650
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: device does not report version:

 * signifies the current active mode

When I try to enable DMA on the SATA drive, this happens:

merc@blackbox:~$ sudo hdparm -d1 /dev/sda

/dev/sda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Inappropriate ioctl for device

Here's an "lsmod | grep via":

merc@blackbox:~$ lsmod | grep via
via_rhine              22788  0
mii                     5504  1 via_rhine
i2c_viapro              8716  0
i2c_core               23960  1 i2c_viapro
sata_via                9476  0
libata                 52488  1 sata_via
via82cxxx              14128  1
ide_core              143748  4 ide_cd,ide_generic,via82cxxx,ide_disk

I have tried removing the via82cxxx modules (I read somewhere that it conflicts with the sata_via module), but even if i deleted the module (the .ko file), it would still showup in the lsmod output.

The weird thing is that I think the SATA drive worked fine with DMA before I added the PATA drive to the computer.



Any help would be greatly appretiated.