href="mailto:rodsmith@rodsbooks.com">rodsmith@rodsbooks.com</a></p>
<p>Originally written: 3/14/2012; last Web page update:
-1/6/2013, referencing rEFInd 0.6.3</p>
+11/10/2013, referencing rEFInd 0.7.5</p>
<p>I'm a technical writer and consultant specializing in Linux technologies. This Web page is provided free of charge and with no annoying outside ads; however, I did take time to prepare it, and Web hosting does cost money. If you find this Web page useful, please consider making a small donation to help keep this site up and running. Thanks!</p>
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+</table>
<hr />
<div style="float:right; width:55%">
+<p><b>Don't be scared by the length of this page!</b> Only portions of this page apply to any given user, and most people can install rEFInd from an RPM or Debian package in a matter of seconds or by using the <tt>install.sh</tt> script in minute or two.</p>
+
<p>Once you've obtained a rEFInd binary file, you must install it to your computer's ESP (or conceivably to some other location). The details of how you do this depend on your OS and your computer (UEFI-based PC vs. Macintosh). The upcoming sections provide details. See the Contents sidebar to the left for links to specific installation procedures. For most Linux users, an RPM or Debian package is the best way to go. If your Linux system doesn't support these formats, though, or if you're running OS X, using the <tt>install.sh</tt> script can be a good way to go. If you're using Windows, you'll have to install manually.</p>
<p class="sidebar" style="width:95%"><b>Important:</b> A rEFInd zip file, when uncompressed, creates a directory called <tt>refind-<i>version</i></tt>, where <tt><i>version</i></tt> is the version number. This directory includes a subdirectory called <tt>refind</tt> that holds the boot loader, along with another that holds documentation, as well as miscellaneous files in <tt>refind-<i>version</i></tt> itself. When I refer to "the <tt>refind</tt> directory" on this page, I mean the directory with that precise name, not the <tt>refind-<i>version</i></tt> directory that is its parent.</p>
<li class="tight"><a href="#efishell">Installing rEFInd Manually Using an EFI Shell</a></ul></li>
+<li class="tight"><a href="#wde">Using OS X Whole-Disk Encryption</a></li>
+
<li class="tight"><a href="#naming">Alternative Naming Options</a>
<ul>
<li class="tight"><a href="#addons">Installing Additional Components</a></li>
-<li class="tight"><a href="#sluggish">Fixing a Sluggish Macintosh Boot</a></li>
+<li class="tight"><a href="#sluggish">Fixing a Macintosh Boot</a>
+
+ <ul>
+
+ <li class="tight"><a href="#moving">Moving rEFInd to an HFS+ Volume</a></li>
+
+ <li class="tight"><a href="#fallback">Using the Fallback Filename</a></li>
+
+ <li class="tight"><a href="#clearing">Clearing the NVRAM Entries</a></li>
+
+ </ul></li>
<li class="tight"><a href="#uninstalling">Uninstalling rEFInd</a></li>
<h2>Installing rEFInd Using an RPM or Debian Package File</h2>
</a>
-<p>Beginning with version 0.6.2, I've included an RPM package file for rEFInd, and I quickly updated this (in 0.6.2-2) to be more sophisticated and to include a Debian package file, as well. If you have a working RPM-based or Debian-based Linux installation that boots in EFI mode, using one of these files is likely to be the easiest way to install rEFInd: You need only download the file and issue an appropriate installation command. In some cases, double-clicking the package in your file manager will install it. If that doesn't work, a command like the following will install the RPM on an RPM-based system:</p>
+<p>Beginning with version 0.6.2, I've included RPM and Debian package files for rEFInd. If you have a working RPM-based or Debian-based Linux installation that boots in EFI mode, using one of these files is likely to be the easiest way to install rEFInd: You need only download the file and issue an appropriate installation command. In some cases, double-clicking the package in your file manager will install it. If that doesn't work, a command like the following will install the RPM on an RPM-based system:</p>
-<pre class="listing"># <tt class="userinput">rpm -Uvh refind-0.6.2-2.x86_64.rpm</tt></pre>
+<pre class="listing"># <tt class="userinput">rpm -Uvh refind-0.7.5-1.x86_64.rpm</tt></pre>
<p>On a Debian-based system, the equivalent command is:</p>
-<pre class="listing"># <tt class="userinput">dpkg -i refind_0.6.2-2_amd64.deb</tt></pre>
+<pre class="listing"># <tt class="userinput">dpkg -i refind_0.7.5-1_amd64.deb</tt></pre>
<p>Either command produces output similar to that described for <a href="#installsh">using the <tt>install.sh</tt> script,</a> so you can check it for error messages and other signs of trouble. The package file installs rEFInd and registers it with the EFI to be the default boot loader. The script that runs as part of the installation process tries to determine if you're using Secure Boot, and if so it will try to configure rEFInd to launch using shim; however, this won't work correctly on all systems. Ubuntu 12.10 users who are booting with Secure Boot active should be wary, since the resulting installation will probably try to use Ubuntu's version of shim, which won't work correctly with rEFInd.</p>
available, installs it. Note that the "<tt>/boot</tt> directory" may be
on a separate partition or it may be part of your root (<tt>/</tt>)
filesystem, in which case the driver for your root filesystem is
- installed. If <tt>install.sh</tt> detects that the filesystem in
- question is ext2fs or ext3fs, it installs the ext4fs driver, which can
- handle all three of these filesystem types. This feature is unlikely to
- work properly from an emergency system, although it might if you have a
- separate <tt>/boot</tt> partition and if you mount that partition at
- <tt>/boot</tt> in your emergency system, and the ESP at
- <tt>/boot/efi</tt>.</li>
+ installed. This feature is unlikely to work properly from an emergency
+ system, although it might if you have a separate <tt>/boot</tt>
+ partition and if you mount that partition at <tt>/boot</tt> in your
+ emergency system, and the ESP at <tt>/boot/efi</tt>.</li>
<li>If you run <tt>install.sh</tt> on Linux and if
<tt>/boot/refind_linux.conf</tt> doesn't already exist,
<td>When you specify this option, <tt>install.sh</tt> copies <i>all</i> the driver files for your architecture. You may want to remove unused driver files after you use this option, especially if your computer uses Secure Boot.</td>
</tr>
<tr>
- <td><tt>--shim <tt class="variable">shim-filename</tt></tt></td>
- <td>If you pass this option to <tt>install.sh</tt>, the script will copy the specified shim program file to the target directory, copy the <tt>MokManager.efi</tt> file from the shim program file's directory to the target directory, copy the 64-bit version of rEFInd as <tt>grubx64.efi</tt>, and register shim with the firmware. (If you also specify <tt>--usedefault</tt>, the NVRAM registration is skipped.) The intent is to simplify rEFInd installation on a computer that uses Secure Boot; when so set up, rEFInd will boot in Secure Boot mode, with one caveat: The first time you boot, MokManager will launch, and you must use it to locate and install a public key. This key file will be located in the rEFInd directory's <tt>keys</tt> subdirectory under the name <tt>refind.cer</tt>. Note that I'm not providing a shim binary myself, but you can download one from <a href="http://www.codon.org.uk/~mjg59/shim-signed/">here.</a> In the not-too-distant future, most distributions will provide their own shim programs, so you'll be able to point to them—for instance, in <tt>/boot/efi/EFI/fedora/shim.efi</tt>.</td>
+ <td><tt>--shim <tt class="variable">shim-filename</tt></tt> or <tt>--preloader <tt class="variable">preloader-filename</tt></tt></td>
+ <td>If you pass this option to <tt>install.sh</tt>, the script will copy the specified shim program file to the target directory, copy the <tt>MokManager.efi</tt> file from the shim program file's directory to the target directory, copy the 64-bit version of rEFInd as <tt>grubx64.efi</tt>, and register shim with the firmware. (If you also specify <tt>--usedefault</tt>, the NVRAM registration is skipped.) When the target file is identified as PreLoader, much the same thing happens, but <tt>install.sh</tt> copies <tt>HashTool.efi</tt> instead of <tt>MokManager.efi</tt> and copies rEFInd as <tt>loader.efi</tt> rather than as <tt>grubx64.efi</tt>. The intent is to simplify rEFInd installation on a computer that uses Secure Boot; when so set up, rEFInd will boot in Secure Boot mode, with one caveat: The first time you boot, MokManager/HashTool will launch, and you must use it to locate and install a public key or register rEFInd as a trusted application. The rEFInd public key file will be located in the rEFInd directory's <tt>keys</tt> subdirectory under the name <tt>refind.cer</tt>. Note that I'm not providing a shim binary myself, but you can download one from <a href="http://www.codon.org.uk/~mjg59/shim-signed/">here.</a> Some distributions also provide their own shim programs, so can point to them—for instance, in <tt>/boot/efi/EFI/fedora/shim.efi</tt>.</td>
</tr>
<tr>
<td><tt>--localkeys</tt></td>
</tr>
<tr>
<td><tt>--yes</tt></td>
- <td>This option causes the script to assume a <tt>Y</tt> input to every yes/no prompt that can be generated under certain conditions, such as if you specify <tt>--shim</tt> but <tt>install.sh</tt> detects no evidence of a Secure Boot installation. This option is intended mainly for use by scripts such as those that might be used as part of an installation via an RPM or Debian package. <b>Note:</b> I introduced this option with the 0.6.2-2 incremental release, which was primarily an update of the 0.6.2 RPM package; it's not yet available in the mainline 0.6.2 version.</td>
+ <td>This option causes the script to assume a <tt>Y</tt> input to every yes/no prompt that can be generated under certain conditions, such as if you specify <tt>--shim</tt> but <tt>install.sh</tt> detects no evidence of a Secure Boot installation. This option is intended mainly for use by scripts such as those that might be used as part of an installation via an RPM or Debian package.</td>
</tr>
</table>
<li>Type <tt><b>cd /boot/efi/EFI/refind</b></tt> to change into rEFInd's new directory on the ESP.</li>
-<li>Type <tt><b>rm refind_ia32.efi</b></tt> to remove the IA32 binary if you're using an <i>x</i>86-64 (64-bit) system; or type <tt><b>rm refind_x64.efi</b></tt> to remove the <i>x</i>86-64 binary if you're using an <i>x</i>86 (32-bit) system. You can optionally rename the binary you keep as <tt>refind.efi</tt>, but this isn't required. (Note that you must keep the version that's the correct bit width for your EFI; if you've installed a 32-bit Linux on a 64-bit PC with a 64-bit EFI, you'd keep <tt>refind_x64.efi</tt>.</li>
+<li>Type <tt><b>rm refind_ia32.efi</b></tt> to remove the IA32 binary if you're using an <i>x</i>86-64 (64-bit) system; or type <tt><b>rm refind_x64.efi</b></tt> to remove the <i>x</i>86-64 binary if you're using an <i>x</i>86 (32-bit) system. (Note that you must keep the version that's the correct bit width for your EFI; if you've installed a 32-bit Linux on a 64-bit PC with a 64-bit EFI, you'd keep <tt>refind_x64.efi</tt>.</li>
<li>Optionally, type <tt class="userinput">rm -r drivers_ia32</tt> to remove the <i>x</i>86 drivers from an <i>x</i>86-64 system, or <tt class="userinput">rm -r drivers_x64</tt> to remove the <i>x</i>86-64 drivers from a 32-bit <i>x</i>86 system. You may also want to remove some or all of the drivers for the architecture you are using. If you don't need them, they'll slow down the start process, and worse, if you're using Secure Boot, rEFInd can load just one shim/MOK-signed driver. See the <a href="drivers.html">page on drivers</a> for more on this topic.</li>
<li>Type <b><tt>xcopy /E refind S:\EFI\refind\</tt></b> to copy the <tt>refind</tt> directory tree to the ESP's <tt>EFI</tt> directory. If you omit the trailing backslash from this command, <tt>xcopy</tt> will ask if you want to create the <tt>refind</tt> directory. Tell it to do so.</li>
-<li>Type <b><tt>cd S:</tt></b> to change to the ESP.</li>
+<li>Type <b><tt>S:</tt></b> to change to the ESP.</li>
<li>Type <b><tt>cd EFI\refind</tt></b> to change into the <tt>refind</tt> subdirectory</li>
<li><a href="https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/ShellBinPkg/UefiShell/Ia32/Shell.efi"><i>x</i>86 (32-bit) shell 2</a></li>
+<li><a href="http://dl.dropbox.com/u/17629062/Shell2.zip">Alternate <i>x</i>86-64 (64-bit) shell 2 for older EFIs</a></li>
+
</ul>
-<p>Note that the shell included in rEFInd's CD-R image version is a version 1 shell, so you can't use it for this purpose. You can, however, copy rEFInd's files from the CD-R. You can even launch the version 1 shell included with rEFInd and then use that to launch a version 2 shell. Once you've booted the shell, you can proceed as follows:</p>
+<p>Note that the IA32 shell included in rEFInd's CD-R image version is a version 1 shell, so you can't use it for this purpose. You can, however, copy rEFInd's files from the CD-R. You can even launch the version 1 shell included with rEFInd and then use that to launch a version 2 shell. The <i>x</i>86-64 shell on the CD-R is the alternate shell, which should work on any <i>x</i>86-64 computer. Once you've booted the shell, you can proceed as follows:</p>
<ol>
<p>With any luck, rEFInd will start up at this point. If not, you can check your settings using a shell or an emergency system for your OS of choice. In an EFI shell, you might type <tt class="userinput">bcfg boot dump -b</tt> to view your boot loader entries and verify that rEFInd appears at the top of the list. Be sure to check the pathname for typos. If you continue to have problems, you might look into giving rEFInd a <a href="#naming">fallback filename</a> that your firmware will recognize.</p>
+<a name="wde">
+<h2>Using OS X Whole-Disk Encryption</h2>
+</a>
+
+<p>If you're using OS X's Whole-Disk Encryption (WDE) feature, you must do two extra things:</p>
+
+<ul>
+
+<li>You must install rEFInd to the ESP. Unfortunately, as described earlier, this can result in a delay (usually of 30 seconds) as the firmware launches rEFInd. See the upcoming <a href="#sluggish">section on fixing sluggish Mac boots</a> if you run into this problem.</li>
+
+<li>You must uncomment the <tt>dont_scan_volumes</tt> line in <tt>refind.conf</tt> and ensure that <tt>"Recovery HD"</tt> is <i>not</i> among its options. (You can use a blank line or provide a dummy value if you want to scan all your volumes.) Alternatively, you can create a manual boot stanza to boot OS X.</li>
+
+</ul>
+
<a name="naming">
<h2>Alternative Naming Options</h2>
</a>
</ul>
-<p>In all cases, if the new version includes new or altered configuration file options, you may need to manually update your configuration file. Alternatively, if you've used the default configuration file, you can replace your working <tt>refind.conf</tt> with <tt>refind.conf-sample</tt> from the rEFInd zip file. (When using <tt>install.sh</tt>, this file will be copied to rEFInd's installation directory under its original name, so you can rename it within that directory to replace the old file.</p>
+<p>In all cases, if the new version includes new or altered configuration file options, you may need to manually update your configuration file. Alternatively, if you've used the default configuration file, you can replace your working <tt>refind.conf</tt> with <tt>refind.conf-sample</tt> from the rEFInd zip file. (When using <tt>install.sh</tt>, this file will be copied to rEFInd's installation directory under its original name, so you can rename it within that directory to replace the old file.)</p>
<p>If you're upgrading to rEFInd from rEFIt, you can simply run the <tt>install.sh</tt> script as described earlier or perform a manual installation. Once installed, rEFInd will take over boot manager duties. You'll still be able to launch rEFIt from rEFInd; a rEFIt icon will appear in rEFInd's menu. You can eliminate this option by removing the rEFIt files, which normally reside in <tt>/EFI/refit</tt>.</p>
<h2>Installing Additional Components</h2>
</a>
-<p>rEFInd includes the ability to launch any EFI program; however, rEFInd detects only certain programs. These include boot loaders in traditional locations and a handful of other programs. To launch these other programs, you must download and install them separately from rEFInd:</p>
+<p>rEFInd includes the ability to launch any EFI program; however, rEFInd detects only certain programs. These include boot loaders in traditional locations and a handful of other programs. To launch most of these other programs, you must download and install them separately from rEFInd:</p>
<ul>
<li><b><a
href="http://tianocore.git.sourceforge.net/git/gitweb.cgi?p=tianocore/edk2;a=blob_plain;f=EdkShellBinPkg/FullShell/X64/Shell_Full.efi;hb=HEAD"><tt>shell.efi</tt></a></b>—This
- file, placed in the ESP's <tt>efi/tools</tt> directory, adds the
+ file, placed in the ESP's <tt>EFI/tools</tt> directory, adds the
ability to launch a text-mode EFI shell from rEFInd. Note that the
download link is to a 64-bit binary that must be renamed before rEFInd
will recognize it. Additional shell download links appear on the <a
Linux wiki,</a> and on other sites; try a Web search if the shell you
find doesn't work to your satisfaction.</li>
-<li><b><tt>gptsync.efi</tt></b>—This program creates a <a
+<li><b><a
+ href="http://www.memtest86.com/download.htm">Memtest86</a></b>—This
+ is a popular tool for performing basic hardware tests, and especially
+ memory tests. rEFInd recognizes this program when it is stored in the
+ <tt>EFI/tools</tt>, <tt>EFI/tools/memtest</tt>,
+ <tt>EFI/tools/memtest86</tt>, <tt>EFI/memtest</tt>, or
+ <tt>EFI/memtest86</tt> directory, with a program filename of
+ <tt>memtest86.efi</tt>, <tt>memtest86_x64.efi</tt>,
+ <tt>memtest86x64.efi</tt>, or <tt>bootx64.efi</tt>. (Change
+ <tt>x64</tt> to <tt>ia32</tt> on IA-32 systems.) Be sure to download
+ the EFI version of the program. If you get the USB flash drive version,
+ you should mount the flash drive's ESP (partition 2) and copy the
+ <tt>EFI/BOOT</tt> directory to your own ESP's
+ <tt>EFI/tools/memtest</tt> or other Memtest86 directory name, as just
+ specified. rEFInd should then recognize it, provided the
+ <tt>showtools</tt> line includes the <tt>memtest</tt> or
+ <tt>memtest86</tt> token.</li>
+
+<li><b><tt>gptsync.efi</tt> or <tt>gptsync_<tt
+ class="variable">arch</tt>.efi</tt></b>—This program creates a <a
href="http://www.rodsbooks.com/gdisk/hybrid.html">hybrid MBR</a> from
your regular GPT disk. A hybrid MBR is a dangerous hack that enables
Windows and OS X to coexist on a Macintosh disk. If you're using a
- UEFI-based PC, a hybrid MBR will be useless at best, so you shouldn't
- create one, and it's safest to not install <tt>gptsync.efi</tt>. If
- you're using a hybrid MBR to enable dual-booting Windows and OS X on a
- Mac, though, placing this program file in the ESP's or Mac boot
- partition's <tt>efi/tools</tt> directory will enable you to regenerate
- your hybrid MBR should some other tool convert the MBR to a standard
- protective MBR. You can obtain the file from the <a
- href="http://refit.sourceforge.net">original rEFIt package.</a></li>
+ UEFI-based PC, a hybrid MBR is likely to be useless at best, so you
+ shouldn't create one, and it's safest to not install
+ <tt>gptsync.efi</tt>. If you're using a hybrid MBR to enable
+ dual-booting Windows and OS X on a Mac, though, placing this program
+ file in the ESP's or Mac boot partition's <tt>EFI/tools</tt> directory
+ will enable you to regenerate your hybrid MBR should some other tool
+ convert the MBR to a standard protective MBR. You can obtain the file
+ from the <a href="http://refit.sourceforge.net">original rEFIt
+ package,</a> or beginning with rEFInd 0.6.9, an updated version is
+ included in the rEFInd package. The rEFInd version of <tt>gptsync_<tt
+ class="variable">arch</tt>.efi</tt> uses a more sophisticated algorithm
+ for determining what GPT partitions to duplicate in the MBR and it
+ includes additional safeguards to minimize the risk of damage should
+ you run the program on a disk that might have been damaged. The
+ original rEFIt version of the program usually goes by the filename
+ <tt>gptsync.efi</tt>, whereas the updated rEFInd version ships with an
+ architecture code, as in <tt>gptsync_x64.efi</tt> or
+ <tt>gptsync_ia32.efi</tt>. The rEFInd <tt>install.sh</tt> script
+ installs <tt>gptsync_<tt class="variable">arch</tt>.efi</tt> when run
+ under OS X, but not when run on Linux. In addition to installing the
+ program, you must edit <tt>refind.conf</tt>, uncomment the
+ <tt>showtools</tt> line, and add <tt>gptsync</tt> to its list of
+ options.</li>
<li><b>Drivers</b>—You can install drivers to extend the capabilities
- of the EFI. rEFInd ships with filesystem drivers for ext2fs and
+ of the EFI. rEFInd ships with filesystem drivers for ext2fs, ext4fs, and
ReiserFS, which can enable you to boot a Linux kernel with EFI stub
support from an ext2fs, ext3fs, ext4fs, or ReiserFS partition. (rEFInd also
provides ISO-9660 and HFS+ drivers.) You can find additional drivers
<h2>Fixing a Sluggish Macintosh Boot</h2>
</a>
-<p>I've received a few reports of a sluggish boot process (a delay of about 30 seconds before starting rEFInd) on some Macs after installing rEFInd. I've been unable to replicate this problem myself, and its true cause remains mysterious to me. I have found <a href="http://ubuntuforums.org/showpost.php?p=12256273&postcount=200">a Web forum post</a> describing a possible fix. Be aware, though, that this procedure involves using the <tt>efibootmgr</tt> utility on Macs, which has been known to damage the firmware on some Macs. Other reports indicate that this problem has been fixed with 3.3.0 and later kernels. Thus, I present this information cautiously and with a strong "use at your own risk" warning. If you care to proceed, I recommend you update your Linux kernel to the latest possible version and then proceed as follows:</p>
+<p>I've received a few reports of a sluggish boot process (a delay of about 30 seconds before starting rEFInd) on some Macs after installing rEFInd. I've been unable to replicate this problem myself, and its true cause remains mysterious to me. I have found three possible solutions, though: <a href="#moving">moving rEFInd to an HFS+ volume,</a> <a href="#fallback">using the fallback filename,</a> and <a href="#clearing">clearing NVRAM entries.</a></p>
+
+<a name="moving">
+<h3>Moving rEFInd to an HFS+ Volume</h3>
+</a>
+
+<p>Most of the reports of sluggish Macintosh boots I've seen note that the user installed rEFInd to the ESP rather than to the OS X root partition. Some users have reported that re-installing rEFInd to the OS X root partition clears up the problem. This is obviously a straightforward solution to the problem, if it works. Note that rEFInd can launch boot loaders that are stored on any partition that the EFI can read no matter where it's installed; therefore, you'll still be able to launch boot loaders stored on the ESP (or elsewhere) if you install it in this way.</p>
+
+<p>The biggest drawback to this approach is that you won't be able to edit the rEFInd configuration file or move rEFInd-related binaries from an EFI shell if you install it in this way, since Apple's HFS+ driver for EFI is read-only. (The same is true of rEFInd's HFS+ driver, so it won't help you overcome this limitation.) You may also be limited in making changes to your rEFInd configuration from Linux or other OSes, too, since Linux's HFS+ drivers disable write support by default on volumes with an active journal. You can force write access by using the <tt>force</tt> option to <tt>mount</tt>; however, this procedure is noted as being risky in the Linux HFS+ documentation, so I don't recommend doing this on a regular basis. As a compromise, you might try creating a small non-journaled HFS+ volume that's dedicated to holding rEFInd. You could even mount it as the Linux <tt>/boot</tt> partition, in which case it would also hold the Linux kernel and related files. You'll need to install rEFInd manually if you try this.</p>
+
+<p>A variant of this solution is suggested in <a href="http://www.sparxeng.com/blog/software/fixing-slow-boot-on-a-triple-boot-mountain-lion-mac">this blog post,</a> which recommends placing rEFInd on an HFS+ volume on the first SATA channel. (In the blogger's case, that channel used to hold an optical drive, but that drive was replaced by a hard disk.)</p>
+
+<a name="fallback">
+<h3>Using the Fallback Filename</h3>
+</a>
+
+<p>I've received a few reports that installing rEFInd to the ESP using the fallback filename (<tt>EFI/BOOT/bootx64.efi</tt> on most systems, or <tt>EFI/BOOT/bootia32.efi</tt> on very old Macs) can work around the problem.</p>
+
+<a name="clearing">
+<h3>Clearing the NVRAM Entries</h3>
+</a>
+
+<p>The first is <a href="http://ubuntuforums.org/showpost.php?p=12256273&postcount=200">a Web forum post</a> that describes a possible fix. Be aware, though, that this procedure involves using the <tt>efibootmgr</tt> utility on Macs, which has been known to damage the firmware on some Macs. Other reports indicate that this problem has been fixed with 3.3.0 and later kernels. Thus, I present this information cautiously and with a strong "use at your own risk" warning. If you care to proceed, I recommend you update your Linux kernel to the latest possible version and then proceed as follows:</p>
<ol>
# <tt class="userinput">efibootmgr --verbose</tt>
Timeout: 10 seconds
BootOrder: 0000,0007
-Boot0000* rEFInd HD(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac1e)File(\EFI\refind\refind.efi)
+Boot0000* rEFInd HD(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac1e)File(\EFI\refind\refind_x64.efi)
Boot0007* CD/DVD Drive BIOS(3,0,00)PATA: HP DVD Writer 1040r .
# <tt class="userinput">efibootmgr --delete-bootnum --bootnum 0000</tt>
Timeout: 10 seconds