Messages in this thread | | | Date | Sat, 31 Jan 2009 22:29:15 +0100 | From | Philippe De Muyter <> | Subject | [BUG] pnpbios breaks floppy support |
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Hello linux experts,
Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and I saw some strange messages when booting :
Floppy drive(s): fd0 is 1.44M floppy0: Floppy io-port 0x03f2 in use
Previously, I had :
Floppy drive(s): fd0 is 1.44M FDC 0 is a post-1991 82077
Needless to say, my floppy hardware works perfectly, and my floppy was usable with the old kernel, while the floppy is now inaccessible with the new kernel. Even /dev/fd0 does not exist anymore.
Searching for a cause to that problem, I saw the following messages before the floppy probe in the new kernel :
PnPBIOS: Scanning system for PnP BIOS support... PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0 PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000 PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver [...] pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved [...]
Searching the web and the outdated pnp kernel documentation, I finally found an option to add to my kernel parameters line :
pnpbios=off
Now my floppy works again, but I am not really satisfied.
What do I loose with the 'pnpbios=off' option ?
Isn't there a smoother option to allow pnpbios but avoiding to reserve floppy's io-ports ?
Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c to make pnpbios and floppy driver coexist peacefully ? And is there an example of such modifications for other standard peripherals ?
Thanks for reading this far
Philippe
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