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

Hey Rob,

I'm on the same hardware - 82C596B (UDMA66) - but using a Seagate 20GB
UDMA100 Drive.  Relevant info from dmesg:

atapci0: <VIA 82C596B UDMA66 controller> port
0xd000-0xd00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 7.1 on pci0
ata0: channel #0 on atapci0

ad0: 19092MB <ST320014A/3.07> [38792/16/63] at ata0-master UDMA66

sysctl -a shows:
hw.ata.ata_dma: 1
hw.ata.wc: 1
hw.ata.atapi_dma: 1

I'm using 5-stable now but didn't have problems when using
5.3-release.  Flakey hardware?

Dennis


On Thu, 10 Feb 2005 19:18:26 -0800 (PST), Rob <spamrefuse_at_yahoo.com> wrote:
> 
> 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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