onmac.net网站还给出实现这一目标的方法。下面是这个补丁包内的说明文件，详细说明了如何突破EFI限制，将XP安装到IntelMac上的。

Xp On Mac (XOM)
***************
'''''''''''''''

Installing XP on an Intel iMac is a two step process.
1. Creating the installation media
2. Running the installer.

The process is 95% automated. There are two sections
below, detailing each one of the two steps highlighted
above.

In each section there are three subsections:

- What you'll need
  Lists the requirements (hardware/software/time) in order
  tom complete the task

- Quick instructions
  No-nonsense instructions for those "in the know".
  Assumes an advanced level of knowledge.

- Step by step instructions
  Can get pretty dull at times, but are quite helpful
  if you want to avoid making any mistake and regretting
  it later.

Choose one set of instructions or choose both and cross
reference between them. The advanced instructions give
a good overview of how far you've gone, and you can
drill into the step-by-step instructions anytime you
have doubts.

So, without further ado...

I. Preparing the XP installation disc.
======================================

A custom slipstreamed CD is required to install XP on a Mac.

What you'll need
----------------
1. An original XP PRO SP2 CDROM
   It doesn't have to be bootable, but it should have a I386
   directory on the root.
2. The xom.zip file.
3. Nero Burning ROM
4. A blank CD
5. A PC of course...
6. 20-30 minutes

Quick instructions for those knowing what they're doing
-------------------------------------------------------
1. Unzip the xom.zip file
2. Use the included sp2.nrb nero project as a baseline.
3. Add the XP source files to the root of the project
4. Overlay the XOM files (in the patch folder) to the root.
5. Set the boot loading image to the included boot.img.
6. Burn and done.

Step-by-step Instructions
-------------------------
1. Unzip the xom.zip file, preserving directory structure.

   (Using WinZip)
   - Double click on xom.zip
   - Press the Extract button
   - Type "C:". You may use another drive, but make sure to
     replace references to C: with the appropriate drive letter.
   - Make sure "Use Folder Names" is on
   - Hit Enter

2. Copy all XP CD files into the xp/src directory.

   - Insert the XP SP2 CD into the CDROM unit.
   - Navigate to D: (or whatever your CDROM unit is)
   - Select all files (Ctrl-A)
   - Copy the files (Ctrl-C)
   - Navigate to C:xpsrc
   - Paste the files (Ctrl-V)
   - Make sure that under the sp2 directory you have at least
     an "I386" folder.

3. Open the sp2.nrb Boot CD project inside the xp directory

   - Navigate to C:xp
   - Double click on the sp2.nrb file.
   - Nero should launch. If not, check your Nero setup.

4. Add the XP source files to the project

   - On Nero, on the right hand pane, navigate to c:xpsrc
   - Select all the files on the rightmost pane (Tab, Ctrl-A)
   - Copy (Ctrl-C)
   - On the left hand pane, click on the CD (it says "XP_PRO_SP2")
   - Paste (Ctrl-V)
   - Make sure the I386 directory is DIRECTLY underneath the CD icon.
     Like this:

     * XP_PRO_SP2
     +-docs
     +-I386
     +-SUPPORT

     It SHOULD NOT LOOK LIKE THIS:

     * XP_PRO_SP2
     +-src
       +-docs
       +-I386
       +-SUPPORT

     If it is wrong, you can start over by selecting all the files
     on the left side and pressing the DEL key.

5. Overlay the XOM files to the project

   - On the right hand pane, navigate to c:xppatch
   - Select all the files on the rightmost pane (Tab, Ctrl-A)
   - Copy (Ctrl-C)
   - On the left hand pane, click on the CD (it says "XP_PRO_SP2")
   - Paste (Ctrl-V)
   - You SHOULD get a dialog saying
     "This folder already contains a folder named 'I386'"
     "Would you like to replace the existing folder?"
     "..."
     [Yes] [Replace All] [No] [Cancel]
     If you didn't get this dialog, you did something wrong, if
     that's the case, close the nero project WITHOUT saving and
     restart from step 3.
   - Click on "Replace All"
   - You should now have a $OEM$ directory next to the I386 one
     in the left most pane.

6. Fix the boot.img reference in the boot tab.

   - Select Compilation Properties (usually F7) from the File menu
   - Go to the Boot tab
   - In the image file field type EXACTLY AS IT IS:
     c:xpoot.img

7. Verify your Nero version is able to burn this CD

   - In the boot tab make sure it says:
     - Kind of emulation: [No emulation]
     - Load segment:      [07C0]
     - Number of sectors: [4]

   - In the ISO tab make sure it says:
     - Data mode:  [Mode 1]
     - Filesystem: [ISO9660+Joliet]
     - Filename length: [Max of 31 chars (level 2)]
     - Character set:   [ISO9660]
     [x] Allow path depth of more than 8
     [x] Allow more than 255 characters in path
     [x] Do not add the ';1' ISO file version extension
     [x] Allow more than 64 characters for Joliet names

   - If any option is not present, upgrade your Nero.

8. Save the nero project. If you ever want to burn the XOM XP
   again, simply reopen this project and continue from step 7.

9. Burn the CD

   - Click on the Burn toolbar button.
   - Make sure "Finalize CD" is turned on.
   - Click on the Burn button.

You're done. Now you have an iiMac friendly XP installation.

II. The installation
====================

The iMac needs to be repartitioned in order to do this.
This procedure requires reformatting the HD. I have not tried
partition managers but if you're feeling adventurous you may
try one. I do not guarantee results in those cases, though.

Be forewarned: This procedure WILL WIPE YOUR iMAC DISK CLEAN.
               Backup any files you don't want to lose.

What you'll need
----------------
1. An intel iMac (iiMac henceforth)
2. The XP CD prepared above.

Quick instructions for those knowing what they're doing
-------------------------------------------------------
1. Partition the disk in two using the OSX CD: FAT and HFS+
2. Install OSX on the HFS+ partition.
3. Copy xom.efi (from xom.zip) into the hard disk
4. cd to the directory where you put xom.efi and type
   sudo bless --folder . --file xom.efi --setBoot
5. Reboot, insert the XP CD, select windows using the arrows
   and wait about 3 minutes
6. Choose the FAT partition you previously created.
   (choose, not create! it should prompt for filesystem)
7. Install. Make sure to remove the CD on subsequent boots,
   otherwise you'll start the process over again.
   Note: The "press any key to boot from CD" prompt doesn't work yet
8. Done!

Step-by-step instructions
-------------------------
1. Boot iiMac with OSX Install CD
   - Insert the OSX Installation CD
   - Turn on the iiMac while pressing the C key.
   - Don't release the C key until you see the grey apple logo.

2. Run Disk Utility
   - Hit Enter on the Language selection dialog
   - Select from the menu: Utilities->Disk Utility

3. Create two partitions, preferably of equal size:
   Partition #1 - Name: xp. Type: MS-DOS
   Partition #2 - Name: osx. Type: Mac OS extended Journal

   - On the left pane click on the internal hard disk (The first
     entry usually). Click on the disk entry, not on any subentries
     it may have.
   - On the right pane click on the partition button at the top.
   - From the "Volume Scheme" drop-down select "2 partitions"
   - Select the first partition on the partition map under the
     Volume Scheme drop-down:
     - Enter "xp" on the Name field
     - Select "MS-DOS File System" from the Format drop-down.
   - Select the second partition
     - Enter "osx" on the Name field
     - Select "Mac OS Extended (Journaled)" from the Format drop-down
   - Click on the Partition button at the bottom right.
   - Click "Partition" on the pop-up warning dialog.
   - You should now see under the disk entry on the left two subentries:
     "XP" and "osx"
   - Quit the disk utility by clicking on the Red button at the dialog top left.

4. Proceed to install OSX on the newly created OS X partition.

   - Click Continue on the bottom left of the install dialog.
   - Click Continue again
   - Click Agree on the pop-up dialog
   - Select the osx partition you just created. This partition should have
     a green arrow.
   - Click Continue
   - Click Continue
   - After a while, the computer reboots

5. Let the computer reboot into OS X and launch a shell window.

   - Once the computer reboots, wait for the movie to end and get through
     the registration process.
   - Once you get to the desktop go to "Go -> Utilities -> Terminal"

6. Copy the xom.efi bootloader to the hard disk and bless it.

   - Copy the xom.efi file into your home directory.
   - In the terminal type:
     sudo cp xom.efi /System/Library/CoreServices  <-- you will have to enter
                                                       your password here
     cd /System/Library/CoreServices
     sudo bless --folder . --file xom.efi --setBoot

7. Insert the slipstreamed XP CD you built into the iiMac and reboot.

   - To eject any disk inside press the eject key on the top left corner of
     your keyboard. You can also eject any disk while rebooting by pressing
     without releasing the F12 key.
   - Select the Apple menu (top left) and choose "Restart"
   - Click "Restart"

8. After rebooting, you should see a crystal Apple logo at the center of the
   screen. Use the arrow keys (up/down) to switch between OS X and Windows.
   Make sure the slipstreamed Windows XP CD is inside, select Windows and
   hit Enter.

   - If you forgot to insert the XP CD, you may insert it _before_
     hitting Enter.
   - If you left a different CD inside, do the following:
     - Turn off the computer
     - Turn it back on _while_pressing_ the F12 key.
     - Don't let go of the F12 key until the CD is out.
     - Insert the XP CD.
   - Now select Windows and hit Enter if you haven't done so yet.

   IMPORTANT NOTE: This will launch the XP setup. for about 2 minutes
                   and a half there will be NO FEEDBACK WHATSOEVER.

9. After about 3 minutes, you will get the partition disk screen.
   Select the XP partition. This partition should read:

   E: Partition1 (EFI) [FAT32]          200 MB (   196 MB free)
   C: Partition2  [Unknown]           78160 MB ( 78159 MB free)
   F: Partition3  [Unknown]           77839 MB ( 77839 MB free)

   Sizes may differ. The important thing is you MUST choose Partition 2.

   ! LEAVE THE FIRST AND THIRD PARTIONS ALONE!!!
   ! DO NOT REPARTITION THE DISK USING THE WINDOWS INSTALLER!!!!

10. The install prompts you for the format type to use: NTFS/FAT Quick/Slow
    If the partition is too large, only the NTFS Quick/Slow options will be shown.
    It is VERY IMPORTANT that you get prompted with this step. If you are
    not prompted for a filesystem to install SOMETHING WENT TERRIBLY WRONG!!!
    YOUR INSTALL WILL NOT WORK in that case.

11. After rebooting, do the following:
    - Press F2 to disable CD booting (there's no feedback, but you can
      press F2 many times, it doesn't hurt). Alternatively, eject the XP CD
      as per step 8.
    - Choose XP by using the down arrow
    - Hit enter.

    NOTE: This time the wait is not that long... just sit tight and wait
          for about 30 secs.

12. The second phase of the XP installer starts. Complete it.
    After finishing this phase, the installer seems to hang. Simply
    wait enough to be sure the system is frozen and cycle power.
    To do this, just keep the power button depressed for about 5 seconds.

13. Restart Windows and finish the installation. Make sure to remove
    all CDs before choosing Windows.

14. Done.

补丁包下载：http://download.onmac.net/

==============
简单翻译(且听枫吟)

MSN：minglancelot@hotmail.com

在Intel iMac上安装XP系统主要分为两个过程：

1.创建安装盘

2.运行安装程序

整个过程95％由程序自动完成，下面将分为两个步骤详细进行讲解说明，每个步骤细分为三个部分：

－－你需要什么（完成该步骤需要的硬件、软件以及花费的时间）

－－快速指南（不对常识进行讲解，假设你拥有较高的计算机知识水平）

－－详细讲解（也许很无聊，但是很有用，如果你不想中间出现什么错误和麻烦，最好照着做哦）

快速指南能够让你迅速了解到安装进程，而详细讲解则能够在任何有疑问的时候帮助你解答

I.制作XP安装盘

A.你需要什么

1.XP Pro SP2 CDROM

必须在根目录有I386文件夹

2.XOM.zip文件

3.Nero Burning ROM

4.空白CD

5.一台PC

6.20－30分钟

B.快速指南

1.解压Xom.zip文件

2.将文件夹中的sp2.nrb作为Nero配置文件

3.将XP安装盘内文件拷贝到XP/SRC目录下

4.将XOM文件复制到根目录下

5.将boot加载镜像指向压缩包中的boot.img

6.刻录XP安装CD

II.安装过程

iMac需要重新格式化硬盘、分区－－记得保存你iMac上存储的资料

A.你需要什么

1.一台Intel核心iMac

2.准备好的XP安装CD

B.快速指南

1.用OXS CD将硬盘进行分区，分为两个新区－－一个给XP，一个给OSX（你不会忘了还要安装OSX吧？嘿嘿）

2.在HFS+分区安装OSX系统

3.将xom.efi文件拷贝到硬盘上

4.键入指令cd进入xom.efi复制到的文件夹，键入--folder . --file xom.efi --setBoot

5.重启，插入XP安装CD，选择Windows，等待大约3分钟

6.在你此前预留的分区选择FAT分区（不要选择创建新分区）

7.安装－－记得在下次重启前将CD退出

8.大功告成