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    SubjectRe: [PATCH] PCI legacy resource fix
    On Wed, 6 Dec 2006 13:41:43 +0000
    Ralf Baechle <> wrote:

    > Since commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f the kernel will try
    > to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if
    > pci_assign_unassigned_resources() is used to do full resource assignment
    > of the bus. This fails because in the PIIX4 these BAR registers have
    > implicitly assumed values and read back as zero; it used to work because
    > the kernel used to just write zero to that register the read back value
    > did match what was written.
    > The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a
    > resource as non-movable. This will also be useful to keep other import
    > system resources from being moved around - for example system consoles
    > on PCI busses.
    > Signed-off-by: Ralf Baechle <>

    Acked-by: Alan Cox <>
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      Last update: 2006-12-06 14:53    [W:0.100 / U:9.304 seconds]
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