Time to kill fdc ?

Hans Ottevanger hans at beastielabs.net
Sun Feb 10 20:26:30 UTC 2013

On 02/10/13 15:55, Poul-Henning Kamp wrote:
> Content-Type: text/plain; charset=ISO-8859-1
> --------
> In message <5117A0CD.6060904 at beastielabs.net>, Hans Ottevanger writes:
>> On 02/10/13 12:46, Daniel O'Connor wrote:
>> But I just did an experiment on an old Pentium 4 system here, using the
>> fdc driver and 8.3-STABLE as of early December (r243900). I read several
>> diskettes using "dd /dev/fd0 /dev/null" and everything went flawlessly.
> Could you try:
> 	dd if=/dev/fd0 of=/dev/null bs=1048576

Tried this, 20 times in a row, without any failures.

Did the same for

dd if=/dev/fd0 of=/tmp/junk bs=1048576

again without failures.

As stated before, this is on an old Pentium 4, now updated to 8.3-STABLE

What hardware are you using? Maybe I can reproduce that panic if I can
find similar hardware in my "collection".

> That consistently exploded 7.x and 8.x here yesterday...
> (I used recoverdisk, but that's not material)
>> Could it be that the drive that Poul-Henning is using is worn out a bit?
> No, that's not it.  It's (amongst other things) ISA-DMA being
> børken (try something different that /dev null btw :-) and bounce
> buffers for same panicking the system.

Kind regards,


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