Date: Fri, 15 Apr 2005 04:06:11 GMT From: "bkoenig@cs.tu-berlin.de" <bkoenig@cs.tu-berlin.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/79944: virtual floppy controller of Virtual PC does not work Message-ID: <200504150406.j3F46Bgf076612@www.freebsd.org> Resent-Message-ID: <200504150410.j3F4APW5090877@freefall.freebsd.org>
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>Number: 79944
>Category: kern
>Synopsis: virtual floppy controller of Virtual PC does not work
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Apr 15 04:10:24 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: bkoenig@cs.tu-berlin.de
>Release:
>Organization:
>Environment:
affects all kernels since Sat Sep 18 04:57:55 2004 UTC (phk's new floppy driver)
>Description:
The virtual floppy disk controller of Microsoft Virtual PC 2004
does not work. This is not a FreeBSD bug, because the virtual controller
simply does not react on attempted resets. Therefore it might be a bug
of Virtual PC 2004.
>How-To-Repeat:
Run FreeBSD 5.3-RELEASE or later with Virtual PC and try to use a
floppy disk image as usual. /dev/fd0 is missing. dmesg.boot shows failure with fdc.
>Fix:
This is not intended as a fix but rather as a hint for users who
just want a working fdc. There is an assertion in fdc_initial_reset in
src/sys/dev/fdc/fdc.c which is true:
/*
* Assert a reset to the floppy controller and check that the status
* register goes to zero.
*/
fdout_wr(fdc, 0);
fdout_wr(fdc, 0);
if (fdsts_rd(fdc) != 0)
return (ENXIO);
Remove the last two of these lines and build and install a new kernel.
>Release-Note:
>Audit-Trail:
>Unformatted:
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