注:用show_pci -vvv可以看到USB的信息:
…
Vendor ID = 8086h, INTEL CORPORATION
Device ID = 7112h,
PCI index = 0h
Class Code = 0c0300h Serial Bus (Universal Serial Bus) ProgIF=0
Revision ID = 0h
Bus number = 0
Device number = 7
Function num = 2
Status Reg = 280h
Command Reg = 5h
Header type = 0h Single-function
BIST = 0h Build-in-self-test not supported
Latency Timer = 40h
Cache Line Size= 0h
IO@1060h length 32 bytes
Subsystem Vendor ID = 15adh
Subsystem ID = 1976h
Max Lat = 0ns
Min Gnt = 0ns
PCI Int Pin = 4
PCI Int Pin = INT D
Interrupt line = 9
…