atapci VIA 82C596B UDMA66 controller: problem for 5.X ?

Hi,

I have two PCs, with apparently a somewhat old
motherboard, since there's a maximum support for
UDMA66 by the harddisk controller.
The attached harddisks are newer and allow a
higher speed of UDMA100.

This combination of older motherboard and newer
harddisk causes great problems with 5.X (it never
did with 4.X). I have irregular crashes of X and
even crashes at initial bootup. All this is solved
by using  hw.ata.ata_dma="0", which forces the
harddisk to use the very low speed of PIO4 :(.

Both PCs have a VIA 82C596B UDMA66 controller.
I wonder if that is the problem for 5.X ?

On these two PCs, the output is of
   grep -i ata /var/run/dmesg.boot
is:

-- PC1 -------------------
atapci0: <VIA 82C596B UDMA66 controller> port
  0xe000-0xe00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7
  at device 7.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
ad0: 43979MB <IBM-DTLA-307045/TX6OA50C> [89355/16/63]
     at ata0-master PIO4
acd0: CDROM <CRD-8520B/1.00> at ata1-master PIO4


-- PC2 -------------------
atapci0: <VIA 82C596B UDMA66 controller> port
  0xc000-0xc00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7
  at device 7.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
ad0: 76319MB <WDC WD800JB-00CRA1/17.07W17>
    [155061/16/63] at ata0-master PIO4
ad1: 16448MB <WDC WD172AA/05.05B05> [33420/16/63] at
     ata0-slave PIO4
acd0: CDRW <HL-DT-ST RW/DVD GCC-4320B/1.00> at
     ata1-master UDMA33

-------------------------------------------------

I consider this a serious drawback of 5.3.

Any idea how this can be resolved?

Best regards,
Rob.


		
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