kern/84799: can't read beyond track 0 on fdc (IBM thinkpad G40)

Joost Bekkers joost at
Thu Aug 11 14:30:24 GMT 2005

>Number:         84799
>Category:       kern
>Synopsis:       can't read beyond track 0 on fdc (IBM thinkpad G40)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 11 14:30:16 GMT 2005
>Originator:     Joost Bekkers
>Release:        FreeBSD 5.4-RELEASE i386
System: FreeBSD 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Tue May 10 13:46:16 CEST 2005 joost at i386

IBM thinkpad G40

all recent versions of FreeBSD

fdc0: <floppy drive controller (FDE)> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: ic_type 90 part_id 73
fdc0: [MPSAFE]
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0


dev/fdc/fdc.c claims

* SEEK to where we want to be
* Enhanced controllers do implied seeks for read&write as long as
* we do not need multiple steps per track.

The fdc in this partucular portable however doesn't perform the implied seek.



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