瞭解 Etherboot 如何加入新的網路卡驅動程式

STEP 1: 從 Etherboot 原始碼開始

• 源起:
  • 目前有很多新的網路卡雖然有支援 PXE 但是卻沒有正式被 PXELinux 支援. 所以必須要找到可以自行加入新網路卡的方法.
• 作法:
  • 測試環境: Debian Etch 4.0r1
  • 下載 git 版本控制軟體

    # apt-get install git cogito git-core
    

    • 註：Ubuntu 只要安裝 git-core 即可。

      # apt-get install git-core
      

  • 修改 git 預設對應

    # update-alternative --config git
    There are 2 alternatives which provide `git'.
    
      Selection    Alternative
    -----------------------------------------------
     +        1    /usr/bin/git.transition
    *         2    /usr/bin/git-scm
    
    Press enter to keep the default[*], or type selection number: 2
    

    • 如果不修改預設 git 對應為 git-scm 會出現以下錯誤訊息

      # git clone git://git.etherboot.org/scm/gpxe.git
      
      git, the filemanager with GNU Interactive Tools, is now called gitfm.
      
      If you are looking for git, Linus Torvald's content tracker, install
      the cogito and git-core packages and see README.Debian and git(7).
      
      This transition script will be removed in the debian stable
      release after etch.
      
      If you wish to complete the transition early, install git-core
      and use (as root):
       update-alternatives --config git
      
      Press RETURN to run gitfm
      
      
      GNU Interactive Tools 4.3.20 (i586-pc-linux-gnu), 10:15:20 Aug 21 2006
      GIT is free software; you can redistribute it and/or modify it under the
      terms of the GNU General Public License as published by the Free Software
      Foundation; either version 2, or (at your option) any later version.
      Copyright (C) 1993-1999 Free Software Foundation, Inc.
      Written by Tudor Hulubei and Andrei Pitis, Bucharest, Romania
      
      /usr/bin/gitfm: fatal error: `chdir' failed: permission denied.
      

    • 註: Ubuntu 不用做更新

      # update-alternatives --config git
      
      There is only 1 program which provides git
      (/usr/bin/git-scm). Nothing to configure.
      

  • 下載 Etherboot 最新版原始碼

    # git clone git://git.etherboot.org/scm/gpxe.git
    

  • 從 Etherboot 原始碼中的 src/drivers/net/sis900.c 開始看

    # cd gpxe
    ~/gpxe# cd src/drivers/net/
    ~/gpxe/src/drivers/net/# ls sis900*
    sis900.c   sis900.h
    

STEP 2: 比較與 Linux Kernel 原始碼的差異

• 下載 Linux Kernel 原始碼
  • 首先請確定 /etc/apt/source.list 裡有 deb src 的來源

    # apt-get source linux-image-`uname -r`
    

• 找尋 sis900.c 跟 sis900.h 的檔案位置

  # find . -name "sis900*"