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    Subject[PATCH] PCI updates - 32-bit IO support
    I have here a system which requires 32-bit IO addressing on its PCI
    busses. Currently, Linux zeros the upper IO base/limit registers on
    all PCI bridges, which prevents addresses being forwarded on this
    system.

    The following patch the upper IO base/limit registers to be set
    appropriately by the PCI layer.

    This patch is being sent for review, and is targetted solely at 2.5.

    diff -ur orig/drivers/pci/setup-bus.c linux/drivers/pci/setup-bus.c
    --- orig/drivers/pci/setup-bus.c Sun Oct 14 20:53:14 2001
    +++ linux/drivers/pci/setup-bus.c Tue Dec 18 23:20:13 2001
    @@ -148,7 +181,10 @@
    pci_write_config_dword(bridge, PCI_IO_BASE, l);

    /* Clear upper 16 bits of I/O base/limit. */
    - pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0);
    + pci_write_config_word(bridge, PCI_IO_BASE_UPPER16,
    + ranges.io_start >> 16);
    + pci_write_config_word(bridge, PCI_IO_LIMIT_UPPER16,
    + ranges.io_end >> 16);

    /* Clear out the upper 32 bits of PREF base/limit. */
    pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, 0);

    --
    Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
    http://www.arm.linux.org.uk/personal/aboutme.html

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