PCI Fixup

  The PCI fixup code for Alpha AXP does rather more than that for Intel (which basically does nothing).

For Intel based systems the system BIOS which ran at boot time has already fully configured the PCI system. This leaves Linux with little to do other than map that configuration. For non-Intel based systems further configuration needs to happen to:

• Allocate PCI I/O and PCI Memory space to each device,
• Configure the PCI I/O and PCI Memory address windows for each PCI-PCI bridge in the system,
• Generate Interrupt Line values for the devices; these control interrupt handling for the device.

The next subsections describe how that code works.

• Finding Out How Much PCI I/O and PCI Memory Space a Device Needs
• Allocating PCI I/O and PCI Memory to PCI-PCI Bridges and Devices