USB card问题 请大大帮帮忙

clloud66kimo

将USB card插在PCI上,不同的USB HC chip显示不同的讯息
NEC
PCI function
PCI Autoconfig: Found Bus 0, Device 2, Function 0
PCI Autoconfig: BAR 0, Mem, size=0x1000000, address=0x4b000000
PCI Autoconfig: Found Bus 0, Device 3, Function 0
PCI Autoconfig: BAR 0, Mem, size=0x20000, address=0x4afe0000
PCI Autoconfig: BAR 1, Mem, size=0x1000, address=0x4afdf000
PCI Autoconfig: BAR 2, Mem, size=0x1000, address=0x4afde000
PCI Autoconfig: Found Bus 0, Device 4, Function 0
PCI Autoconfig: BAR 0, Mem, size=0x1000, address=0x4afdd000<--
PCI Autoconfig: Found Bus 0, Device 4, Function 1
PCI Autoconfig: BAR 0, Mem, size=0x1000, address=0x4afdc000<---
PCI Autoconfig: Found Bus 0, Device 4, Function 2
PCI Autoconfig: BAR 0, Mem, size=0x100, address=0x4afdbf00



VIA
PCI function
PCI Autoconfig: Found Bus 0, Device 2, Function 0
PCI Autoconfig: BAR 0, Mem, size=0x1000000, address=0x4b000000
PCI Autoconfig: Found Bus 0, Device 3, Function 0
PCI Autoconfig: BAR 0, Mem, size=0x20000, address=0x4afe0000
PCI Autoconfig: BAR 1, Mem, size=0x1000, address=0x4afdf000
PCI Autoconfig: BAR 2, Mem, size=0x1000, address=0x4afde000
PCI Autoconfig: Found Bus 0, Device 4, Function 0
PCI Autoconfig: BAR 0, I/O, size=0x20, address=0xffffffe0<----------
PCI Autoconfig: Found Bus 0, Device 4, Function 1
PCI Autoconfig: BAR 0, I/O, size=0x20, address=0xffffffc0<----------
PCI Autoconfig: Found Bus 0, Device 4, Function 2
PCI Autoconfig: BAR 0, Mem, size=0x100, address=0x4afddf00
PCI: bus0: Fast back to back transfers disabled


两各有什么差别????
BAR type memory 和 I/O 差别在哪里???