Re: [bug] aic7xxx panic Re: Linux 2.4.1-ac5

From: Doug Ledford (
Date: Wed Feb 07 2001 - 19:02:56 EST

"J . A . Magallon" wrote:
> On 02.07 Tigran Aivazian wrote:
> > Alan, Doug,
> >
> > If this is a known problem -- ignore. Otherwise, I will gladly assist as
> > much as you need.
> >
> > Just tried ac5 kernel and, behold (btw, why does serial console not work
> > anymore, I had to copy these by hand):
> >
> > (scsi0) BRKADRINT error(0x44):
> > Illegal Opcode in sequencer program
> > PCI Error detected
> > (scsi0) SEQADDR=0x58
> > Kernel panic: aic7xxx: unrecoverable BRKADRINT
> >
> > The Linux 2.4.2-pre1 works fine. Next thing I was thinking was to try ac4
> > and also to try on a different machine which has a different revision of
> > the same type of aic7xxx HBA.
> >
> I am running ac5 on a AHA-2940U2/W, no problem.
> I patched the kernel with a patch from Doug Ledford posted in the list.

Problems with disks and CD-ROMs connected to non-Ultra2 controllers is
confirmed and I think my fix is just about done (currently testing a minor
sequencer change to solve the problem, I cleared SG_COUNT when I shouldn't
have, which meant disconnects in the middle of a transfer spelled death for
the transfer, resulting in a data overrun on reconnect, and this problem only
shows up on non-Ultra2 controllers under real transfers scenarios, which my
testing missed because I was using all Ultra2 controllers, so I built another
test machine with non-Ultra2 controllers to check my fix)


Doug Ledford <> Please check my web site for aic7xxx updates/answers before e-mailing me about problems - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to Please read the FAQ at

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