Messages in this thread Patch in this message | | | Date | Tue, 18 Dec 2001 23:50:24 +0000 | From | Russell King <> | Subject | [PATCH] PCI updates - 32-bit IO support |
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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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