cvs commit: src/sys/dev/fdc fdc_isa.c
phk at phk.freebsd.dk
Sun Sep 19 23:23:59 PDT 2004
In message <200409200612.i8K6CJ12009866 at repoman.freebsd.org>, Warner Losh write
> It accesed FDSTS and FDDATA incorrectly via the second resource (which
> wound up accessing FDOUT and the tape register at 0x3f3) and badly for
> the CTL register (at location 0x3f4). This is a minimal fix that just
> 'eats' the first one if it covers two locations and has an offset of
> 0. This confusion lead the floppy driver to think there'd been a disk
> change, which uncovered a deadlock in the floppy/geom code which lead
> to a panic.
The "deadlock" is only there if the disk-change line goes from
active to inactive when it shouldn't. To reset this pin it is necessary
to execute a step to the controller.
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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