http://www.tutorialspoint.com/unix_commands/setpci.htm
NAME
setpci - configure PCI devices
SYNOPSIS
setpci [options] devices operations...
DESCRIPTION
setpci is a utility for querying and configuring PCI devices.
All numbers are entered in hexadecimal notation.
Root privileges are necessary for almost all operations, excluding reads of the standard header of the configuration space on some operating systems. Please see lspci(8) for details on access rights.
OPTIONS
| Tag | Description |
|---|---|
| -v | Tells setpci to be verbose and display detailed information about configuration space accesses. |
| -f | Tells setpci not to complain when there’s nothing to do (when no devices are selected). This option is intended for use in widely-distributed configuration scripts where it’s uncertain whether the device in question is present in the machine or not. |
| -D | ‘Demo mode’ -- don’t write anything to the configuration registers. It’s useful to try setpci -vD to see what your complex sequence of setpci operations does before you actually execute it. |
| --version | |
| Shows setpci version. This option should be used stand-alone.
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DEVICE SELECTION
Before each sequence of operations you need to select which devices you wish that operation to affect.
| Tag | Description |
|---|---|
| -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] | |
| Show only devices in the specified domain (in case your machine has several host bridges, they can either share a common bus number space or each of them can address a PCI domain of its own; domains are numbered from 0 to ffff), bus (0 to ff), slot (0 to 1f) and function (0 to 7). Each component of the device address can be omitted or set to "*", both meaning "any value". All numbers are hexadecimal. E.g., "0:" means all devices on bus 0, "0" means all functions of device 0 on any bus, "0.3" selects third function of device 0 on all buses and ".4" shows only the fourth function of each device. | |
| -d [<vendor>]:[<device>] | |
| Select devices with specified vendor and device ID. Both ID’s are given in hexadecimal and may be omitted or given as "*", both meaning "any value".
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OPERATIONS
To query value of a configuration register, just name it (either by typing its name or by typing register address with optional .B, .W or .L suffix specifying register width as byte, word or longword).
To set a register, write reg=values where reg is the same as you would use to query the register and values is a comma-separated list of values you want to write starting with the given address. Each value to be written can be specified either as a hexadecimal number or as a bits:mask pair which causes the bits corresponding to binary ones in the mask to be changed to values of the corresponding bits in the bits
REGISTER NAMES
setpci knows the following configuration register names. See PCI bus specifications for their precise meaning or consult header.h or/usr/include/linux/pci.h for a couple of comments.
VENDOR_ID DEVICE_ID COMMAND STATUS REVISION CLASS_PROG CLASS_DEVICE CACHE_LINE_SIZE LATENCY_TIMER HEADER_TYPE BIST BASE_ADDRESS_0 BASE_ADDRESS_1 BASE_ADDRESS_2 BASE_ADDRESS_3 BASE_ADDRESS_4 BASE_ADDRESS_5 CARDBUS_CIS SUBSYSTEM_VENDOR_ID SUBSYSTEM_ID ROM_ADDRESS INTERRUPT_LINE INTERRUPT_PIN MIN_GNT MAX_LAT PRIMARY_BUS SECONDARY_BUS SUBORDINATE_BUS SEC_LATENCY_TIMER IO_BASE IO_LIMIT SEC_STATUS MEMORY_BASE MEMORY_LIMIT PREF_MEMORY_BASE PREF_MEMORY_LIMIT PREF_BASE_UPPER32 PREF_LIMIT_UPPER32 IO_BASE_UPPER16 IO_LIMIT_UPPER16 BRIDGE_ROM_ADDRESS BRIDGE_CONTROL CB_CARDBUS_BASE CB_CAPABILITIES CB_SEC_STATUS CB_BUS_NUMBER CB_CARDBUS_NUMBER CB_SUBORDINATE_BUS CB_CARDBUS_LATENCY CB_MEMORY_BASE_0 CB_MEMORY_LIMIT_0 CB_MEMORY_BASE_1 CB_MEMORY_LIMIT_1 CB_IO_BASE_0 CB_IO_BASE_0_HI CB_IO_LIMIT_0 CB_IO_LIMIT_0_HI CB_IO_BASE_1 CB_IO_BASE_1_HI CB_IO_LIMIT_1 CB_IO_LIMIT_1_HI CB_SUBSYSTEM_VENDOR_ID CB_SUBSYSTEM_ID CB_LEGACY_MODE_BASE
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PCILIB OPTIONS
The PCI utilities use PCILIB (a portable library providing platform-independent functions for PCI configuration space access) to talk to the PCI cards. Please see lspci(8) for a list of switches controlling behavior of the library.
EXAMPLES
‘setpci -d *:* latency_timer=40’ sets the latency timer to 64 (40 hexadecimal).
‘setpci -s 0 device_id vendor_id’ lists ID’s of devices in slot 0 in all buses.
‘setpci -s 12:3.4 3c.l=1,2,3’ writes longword 1 to register 3c, 2 to register 3d and 3 to register 3e of device at bus 12, slot 3, function 4.
‘setpci -s 13:8.4 40.b=50:d0,04:0c,ff’ works on bus 13, device 8, function 4: turns bit 7 off and bits 6 and 4 on in the byte register 40; turns bit 3 off and bit 2 on in the byte register 41; sets byte register 42 to ff.
setpci命令是一個查詢和配置PCI設備的使用工具。
語法
選項
參數
- PCI設備：指定要配置的PCI設備；
- 操作：指定要完成的配置操作。
實例
Linux下調節筆記本屏幕亮度方法：
首先進入終端輸入lspci命令，列出各種設備的地址：
發現00:02.0是VGA設備，於是我們修改它的屬性：
解釋一下：
- setpci是修改設備屬性的命令。
- -s表示接下來輸入的是設備的地址。
- 00:02.0 VGA設備地址（<總線>:<接口>.<功能>）。
- F4要修改的屬性的地址，這裡應該表示“亮度”。
- .B修改的長度（B應該是字節（Byte），還有w（應該是Word，兩個字節）、L（應該是Long，4個字節））。
- =FF要修改的值（可以改）。
我這裡00是最暗，FF是最亮，不同的電腦可能不一樣。比如說我嫌FF太閃眼了，我就可以：
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