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    Subjectenabling AMD_PM768 causes boot hang in 2.4.20-rc3

    With a dual-processor A7M266-D MB (two AMD XP-MP 1900+), enabling
    CONFIG_AMD_PM768 causes the machine to hang on boot.

    I don't think this is a major concern for the release because the
    description of this parameter includes EXPERIMENTAL (although it is not
    flagged to be selectable on when experimental options are enabled).

    A few details: The kernel is booted with noapic (has always hung
    otherwise). It hangs right after listing the drives and ide interfaces,
    and right before it prints out the geometry of the first drive. This is
    the output prior to hanging:

    ide9: BM-DMA at 0x4408-0x440f, BIOS settings: hds:pio, hdt:pio
    hda: IC35L120AVVA07-0, ATA DISK drive
    hdc: IC35L120AVVA07-0, ATA DISK drive
    hde: IC35L120AVVA07-0, ATA DISK drive
    hdf: IC35L120AVVA07-0, ATA DISK drive
    hdg: IC35L120AVVA07-0, ATA DISK drive
    hdh: IC35L120AVVA07-0, ATA DISK drive
    hdi: IC35L120AVVA07-0, ATA DISK drive
    hdj: IC35L120AVVA07-0, ATA DISK drive
    hdk: IC35L120AVVA07-0, ATA DISK drive
    hdl: IC35L120AVVA07-0, ATA DISK drive
    hdn: ASUS CD-S520/A, ATAPI CD/DVD-ROM drive
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    ide1 at 0x170-0x177,0x376 on irq 15
    ide2 at 0xb400-0xb407,0xb002 on irq 11
    ide3 at 0xa800-0xa807,0xa402 on irq 11
    ide4 at 0x9800-0x9807,0x9402 on irq 10
    ide5 at 0x9000-0x9007,0x8802 on irq 10
    ide6 at 0x7400-0x7407,0x7002 on irq 10
    blk: queue c0394184, I/O limit 4095Mb (mask 0xffffffff)

    (I'm extracting this output from a working 2.4.20-rc3 compiled without
    AMD_PM768. The output is the same except that the last line says queue
    c03941e4 instead of the value above.)

    The next line should have been:
    hda: 241254720 sectors (123522 MB) w/1863KiB Cache, CHS=239340/16/63,

    ide0 is a
    AMD7441: IDE controller on PCI bus 00 dev 39
    AMD7441: chipset revision 4
    AMD7441: not 100% native mode: will probe irqs later
    AMD7441: disabling single-word DMA support (revision < C4)
    ide0: BM-DMA at 0xb800-0xb807, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xb808-0xb80f, BIOS settings: hdc:DMA, hdd:pio

    I'll be happy to help if someone needs more debugging information.


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