Re: dma problems with Serverworks CSB5 chipset

[Torbjörn Olander]

I'm having the same problems here with linux 2.6.8-rc2 kernel here with
an Intel SAI2 dual SMP P3 motherboard with Serverworks Serverset III LE
chipset and CSB5 southbridge.

I run one WDC WD400BB-00DEA0 as master on each channel with SW RAID1 for
system. To even get DMA working I had to add
append="ide0=ata66 ide1=ata66"
in my lilo config. The system works fine with low load on the disks, but
if I copy greater amounts of data from a local SW RAID5 array I get the
same DMA timeout error and often it locks up completely.

If i disable DMA with hdparm the system works fine.

/proc/ide/svwks output:
(DMA disabled with hdparm)

                             ServerWorks OSB4/CSB5/CSB6

                            ServerWorks CSB5 Chipset (rev 93)
------------------------------- General Status
---------------------------------
--------------- Primary Channel ---------------- Secondary Channel
-------------
                 enabled                          enabled
--------------- drive0 --------- drive1 -------- drive0 ----------
drive1 ------
DMA enabled:    no               no              no                no 
UDMA enabled:   yes              no              yes               no 
UDMA enabled:   2                0               2                 0
DMA enabled:    2                2               2                 2
PIO  enabled:   4                0               4                 0



On Tue, 2004-08-03 at 19:31, Alan Cox wrote:
> On Maw, 2004-08-03 at 19:08, Marcelo Tosatti wrote:
> > ServerWorks OSB4/5 chipsets are known to not work reliably with the Linux
> > IDE code. AFAIK its a hardware problem which we dont correctly work around.
> > 
> > Have you tried disabling DMA?
> > 
> > Bart and Alan are IDE experts, they can probably give you more useful
> > information.
> 
> CSB5 is reliable, rock solidly so in my experience. OSB4 was the older
> interface with problems. Are these systems SMP, what disks are you using
> and in what IDE mode ?
> 
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-- 
Med vänliga hälsningar / Best regards
Torbjörn Olander
tosse@xxxxxxxxxxxxxx

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