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SubjectRe: Problem with sym53c8xx

The sym53c875 detected a PCI data parity error while it was acting as a
master (i.e. doing DMA). This checking can be disabled from the boot
command line:

sym53c8xx=mpar:n

If your system then runs stable, it may well be that the error is not
real. FYI, it seems that some rare combination of hardware + symbios chips
can trigger such errors without the DMAed data having been corrupted.
Another possibility might be that your hardware is actually broken.

You also may give a try with the ncr53c8xx driver. Historically, this
driver leaves unchanged the bit in the PCI COMMAND register that refers to
PCI parity error reporting. Given that BIOSes generally donnot set this
bit, any PCI parity error detected by the sym53c875 will be silently
discarded.

Gerard.

On Sun, 20 Aug 2000, Drew Bertola wrote:

> I'm using a Tekram DC-390F with only a Plextor PX-W124TS CD-RW. The
> sym53c8xx driver seems to load just fine. But when accessing the
> drive using cdrdao, I run into trouble. Here is an excerpt of the log
> file (once they start, these errors repeat continuously):
>
> btw, I'm currently running 2.4-test5.
>
>
> Aug 19 15:16:58 champ kernel: sym53c875E-0:6: ERROR (c0:0) (8-0-0) (8/95) @ (script 50:f31c0004).
> Aug 19 15:16:58 champ kernel: sym53c875E-0: script cmd = 90080000
> Aug 19 15:16:58 champ kernel: sym53c875E-0: regdump: da 00 00 95 47 08 06 0f 04 08 86 00 80 00 0f 02 00 c0 40 12 02 ff ff ff.
> Aug 19 15:16:58 champ kernel: sym53c875E-0: restart (scsi reset).
> Aug 19 15:16:58 champ kernel: sym53c875E-0: Downloading SCSI SCRIPTS.
> Aug 19 15:16:58 champ kernel: sym53c875E-0:0: ERROR (c0:0) (8-0-0) (0/5) @ (script 40:e21c0004).
> Aug 19 15:16:58 champ kernel: sym53c875E-0: script cmd = f3100004
> Aug 19 15:16:58 champ kernel: sym53c875E-0: regdump: ca 00 00 05 47 00 00 0f 00 08 00 00 80 00 08 02 00 d0 40 12 00 ff ff ff.
> Aug 19 15:16:58 champ kernel: sym53c875E-0: restart (scsi reset).
> Aug 19 15:16:58 champ kernel: sym53c875E-0: Downloading SCSI SCRIPTS.
> Aug 19 15:16:58 champ kernel: sym53c875E-0:0: ERROR (c0:0) (8-0-0) (0/5) @ (script 40:e21c0004).
> Aug 19 15:16:58 champ kernel: sym53c875E-0: script cmd = f3100004
> Aug 19 15:16:58 champ kernel: sym53c875E-0: regdump: ca 00 00 05 47 00 00 0f 00 08 00 00 80 00 08 02 00 d0 40 12 00 ff ff ff.
> Aug 19 15:16:58 champ kernel: sym53c875E-0: restart (scsi reset).
>
> --
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