Time to kill fdc ?

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Feb 10 14:55:50 UTC 2013

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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

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.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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