18.1 PCI Root Bridge I/O Protocol Drivers
UEFI firmware for a platform typically implements a Root Bridge Driver that produces the PCI Root Bridge I/O Protocol. This code is chipset specific and directly accesses the chipset resources producing the services of the PCI Root Bridge I/O Protocol. A sample driver for systems with a PC-AT-compatible chipset is included in EDK II. The source code for this driver is found in the EDK II package called PcAtChipsetPkg in the directory PcAtChipsetPkg/PciHostBridgeDxe.
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