On 11/25/2011 06:53 AM, Sedat Dilek wrote:
Hi,
I am watching this issue for a long while, due to my
floppy-blacklist.conf file since next-20110603.
The bad: The boot-process stalls for approx 10-13 secs when booting
into my Debian/sid i386 system.
# dmesg | grep -A1 -B1 "end_request: I/O error, dev fd0, sector 0"
[ 2.422854] sd 2:0:0:0: [sdb] Attached SCSI disk
[ 15.289939] end_request: I/O error, dev fd0, sector 0
[ 15.342914] EXT4-fs (sda5): mounted filesystem with ordered data
mode. Opts: (null)
The funny part is my IBM laptop has no physical floppy drive!
# dmesg | egrep -i 'floppy|fd0'
[ 0.726358] Floppy drive(s): fd0 is 1.44M
[ 15.289939] end_request: I/O error, dev fd0, sector 0
If I blacklist "floppy" kernel-module, the boot-process is as expected
without the above mentionned delay.
[ /etc/modprobe.d/floppy-blacklist.conf ]
# This file blacklists the floppy driver.
#
# XXX: Workaround: My IBM ThinkPad T40p (model 2374SG6) notebook has
no physical FDD
# dmesg from linux-next (next-20110603) says:
# [ 0.755294] Floppy drive(s): fd0 is 1.44M
# [ 15.238507] end_request: I/O error, dev fd0, sector 0
blacklist floppy
- EOF -
I searched for the line and found bool blk_update_request() in
block/blk-core.c file (see [1]).
I have attached kern.log and dmesg.
Hope this helps to narrow down the issue.
It looks like your laptop's BIOS indicates it has a floppy controller
that's active:
Nov 25 11:00:32 tbox kernel: [ 0.060821] pnp 00:09: [io 0x03f0-0x03f5]
Nov 25 11:00:32 tbox kernel: [ 0.060825] pnp 00:09: [io 0x03f7]
Nov 25 11:00:32 tbox kernel: [ 0.060828] pnp 00:09: [irq 6]
Nov 25 11:00:32 tbox kernel: [ 0.060831] pnp 00:09: [dma 2]
Nov 25 11:00:32 tbox kernel: [ 0.060892] pnp 00:09: Plug and Play
ACPI device, IDs PNP0700 (active)
That's presumably why the floppy driver ends up being loaded. And
apparently it does have a floppy controller, since the floppy driver
seems able to talk to it. Maybe that model of laptop had an optional
bay-mounted floppy drive or something?
I'm not sure there's a workaround for this at the kernel level, since
the kernel probably can't determine if there's actually a floppy drive
installed without trying to read from it (which is likely being
triggered by partition probing or something). The read error will be
what is triggering the message you saw.
Is there a BIOS option to disable the floppy controller?
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