Messages in this thread |  | | | Date | Sun, 1 Feb 2009 22:56:16 +0100 | | From | Philippe De Muyter <> | | Subject | Re: [BUG] pnpbios breaks floppy support |
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On Sun, Feb 01, 2009 at 03:48:49PM -0500, Adam M Belay wrote: > Quoting Robert Hancock <hancockrwd@gmail.com>: > >> Philippe De Muyter wrote: >>> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote: >>>> Philippe De Muyter wrote: >>>>> 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 Searching the web and the outdated pnp kernel documentation, I 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 ? >>>> Presumably the problem is that your BIOS marks the IO ports used by the >>>> floppy controller as reserved which prevents the floppy driver from >>>> binding to them. (2.6.11 probably was before we even processed PnP >>>> reserved regions.) >>>> >>>> I think we now have handling for the case where the reservations overlap >>>> PCI devices, but I think it's the first I've heard of them overlapping >>>> the floppy IO ports.. >>> >>> I should have added that, when started with pnpbios enabled, I have found >>> the following in /sys/devices/pnp0/ : >>> >>> $ cat 00:03/id >>> PNP0700 >>> $ cat 00:03/resources state = active >>> io 0x3f4-0x3f5 >>> io 0x3f2-0x3f2 >>> irq 6 >>> dma 2 >>> $ cat 00:03/options >>> port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding >>> port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding >>> irq 6 High-Edge >>> dma 2 8-bit compatible >>> >>> AFAIK, PNP0700 is the pnp id for the standard floppy disk, >>> and the resources and options files describe the expected io-ports >>> of the floppy disk, so this does not seem to be an error in the bios. >> >> There's likely another resource with id of PNP0C01 or PNP0C02 (Motherboard >> resources) which contains that same IO port range. >> > > Yes, could you post the same information for 00:07 so we can start to > narrow > this down? Also having "cat /proc/ioports" couldn't hurt.
Here it is, and that shows that you are thus both really experts in that area :
$ cat 00:07/id 00:07/resources PNP0c02 state = active io 0x80-0x80 io 0x10-0x1f io 0x22-0x3f io 0x44-0x5f io 0x90-0x9f io 0xa2-0xbf io 0x3f0-0x3f1 io 0x3f3-0x3f3 mem 0x100000-0xc0fffff mem 0xfff80000-0xfff94fff mem 0xfff98000-0xfffbffff mem 0xfffc0000-0xffffffff $ cat /proc/ioports 0000-001f : dma1 0020-0021 : pic1 0040-0043 : timer0 0050-0053 : timer1 0060-006f : keyboard 0070-0077 : rtc 0080-008f : dma page reg 00a0-00a1 : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : 0000:00:07.1 0170-0177 : libata 01f0-01f7 : 0000:00:07.1 01f0-01f7 : libata 02f8-02ff : serial 0376-0376 : 0000:00:07.1 0376-0376 : libata 0378-037a : parport0 037b-037f : parport0 03c0-03df : vga+ 03f0-03f1 : pnp 00:07 03f3-03f3 : pnp 00:07 03f6-03f6 : 0000:00:07.1 03f6-03f6 : libata 03f8-03ff : serial 04d0-04d1 : pnp 00:11 0cf8-0cff : PCI conf1 ec00-ec7f : 0000:00:03.0 ec00-ec7f : tulip ecf0-ecff : 0000:00:07.1 ecf0-ecff : libata Thanks for your quick answers. Feel free to ask more info's
Philippe
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