each funciton will have it`s config registers
PCI: 256 Byte config space
PCIe: 4K Byte config space
Type 0 Header: for end point device
Type 1 Header: for bridge device
Bus: 8bit, 0~255
Device: 5bit, 0~31
Function: 3bit, 0~7
BIOS Architecture 学习笔记06 - PCI Basics and Bus Enumeration
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