ThinkPad T43 系列机型集成了 Broadcom网卡 ，在开机的时候可以按 Ctrl S 进入网卡的 Boot Agent 设置
开机后用户会看到屏幕上的提示信息
Broadcom NetXtreem Ethernet Boot Agent v7.7.5
Copyright (C) 2000-2004 Broadcom Corporation
All right reserved
Press Ctrl-S to Enter Configuration Menu ...

按Ctrl S进入后，看到如下的界面，[]里的是其他的选项
Broadcom NetXtreem Ethernet Boot Agent v7.7.5
Copyright (C) 2000-2004 Broadcom Corporation
All right reserved
======================================================================================
MBA Configuration Menu
Boot Protocol Preboot eXecution Environment(PXE)
Boot Strap type Auto Detect
Hide Setup Prompt Disable[Enable]
Setup Key Stroke Ctrl-S[Ctrl-B]
Banner Message Timeout None[1 Second, 2 Second]
Link Speed AutoNeg[10Mbps Half,10Mbps Full,100Mbps Half,100Mbps Full]
Pre-Boot Wake On LAN Enable
Bus = 02 Device = 00 Func = 0

======================================================================================
<Esc> <Ctrl-F6> <Left/Right> <Up/Down> <F4>
Quit Blink LEDs Change Value Change Field Save
修改好之后按F4保存退出就可以了