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PCI: skip ISA ioresource alignment on some systems

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Skip ISA ioresource alignment on some systems

To conserve limited PCI i/o resource on some IBM multi-node systems, the
BIOS allocates (via _CRS) and expects the kernel to use addresses in
ranges currently excluded by pcibios_align_resource() [i386/pci/i386.c].
This change allows the kernel to use the currently excluded address
ranges on the IBM x3800, x3850, and x3950.

Signed-off-by: Gary Hade <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Gary Hade 2007-10-03 15:56:14 -07:00 • committed by Greg Kroah-Hartman
commit 036fff4cf7
4 changed files with 58 additions and 2 deletions
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4
drivers/pci/probe.c
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@ -544,7 +544,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
goto out;
child->primary = buses & 0xFF;
child->subordinate = (buses >> 16) & 0xFF;
child->bridge_ctl = bctl;
child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
cmax = pci_scan_child_bus(child);
if (cmax > max)
@ -597,7 +597,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
if (!is_cardbus) {
child->bridge_ctl = bctl | PCI_BRIDGE_CTL_NO_ISA;
child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
/*
* Adjust subordinate busnr in parent buses.
* We do this before scanning for children because