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SubjectRe: aic7xxx and tapse (Was Re: How to force a kernel panic ?)
On 14 Jan 1997, John Henders wrote:

> In <> "Richard B. Johnson" <> writes:
> >If I execute:
> ># ls -R /mnt
> >With /mnt containing a MS-DOS file system. The result can't be saved because
> >of the panic that results. Basically, there are a bunch of "Queue full"
> >messages, followed by timeout messages, followed by SCSI reset then aborting
> >the SCSI command messages, followed by 'aiee freeing interrupt', going
> >down hill from there.
> [...]
> >The basic reason for the crash is that the SCSI device is being asked
> >to read beyond the physical end of the media. I verified this by hacking
> >the code. A sector-number of 0xA0001AFF starts this off with my MS-DOS
> >file-system. The media only contains 4406960 512 byte sectors, i.e.,
> >0x433EB0. I think there is a signed/unsigned problem somewhere in
> >the code........
> This is very odd. I have a 1 gig dos (vfat) partition on my 2 gig scsi
> drive and I can do the above test without a problem. I wonder if the
> problem is with the aic driver or the msdos file system code.
> As to the scsi tape problem, have you tried lowering the bus negotiation
> speed on the card for the exabyte. As someone else noted, there's no
> problem with Archive DAT's at all. I use one regularly on my 2940.

The kernel messages say "Synchronous at 4 MHz" for the CD-ROM, 10 MHz for
the disks, and "Refusing synchronous negotiation" for the tape. This is
correct. Async transfer is done at whatever speed (non setable) the
controller/bus/device allows (the handshake controls the speed).

The MS-DOS file-system does not crash if I mount a 330 megabyte partition.
I think the problem starts at 524,288 * 1024 bytes (hint, hint).

Dick Johnson
Richard B. Johnson
Project Engineer
Analogic Corporation
Voice : (508) 977-3000 ext. 3754
Fax : (508) 532-6097
Modem : (508) 977-6870
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Email :,
Penguin : Linux version 2.1.20 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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