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-rw-r--r--doc/guix.texi22
1 files changed, 19 insertions, 3 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index d069b7f0e6..7bedb8660e 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -103,6 +103,7 @@ Copyright @copyright{} 2021 Josselin Poiret@*
 Copyright @copyright{} 2022 Remco van 't Veer@*
 Copyright @copyright{} 2022 Aleksandr Vityazev@*
 Copyright @copyright{} 2022 Philip M@sup{c}Grath@*
+Copyright @copyright{} 2022 Karl Hallsby@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -36270,8 +36271,8 @@ The type of a bootloader configuration declaration.
 @cindex BIOS, bootloader
 The bootloader to use, as a @code{bootloader} object.  For now
 @code{grub-bootloader}, @code{grub-efi-bootloader},
-@code{grub-efi-netboot-bootloader}, @code{extlinux-bootloader} and
-@code{u-boot-bootloader} are supported.
+@code{grub-efi-netboot-bootloader}, @code{grub-efi-removable-bootloader},
+@code{extlinux-bootloader} and @code{u-boot-bootloader} are supported.
 
 @cindex ARM, bootloaders
 @cindex AArch64, bootloaders
@@ -36340,6 +36341,20 @@ NFS servers, you also need a properly configured DHCP server to make the booting
 over netboot possible.  For all this we can currently only recommend you to look
 for instructions about @acronym{PXE, Preboot eXecution Environment}.
 
+@vindex grub-efi-removable-bootloader
+@code{grub-efi-removable-bootloader} allows you to boot your system from
+removable media by writing the GRUB file to the UEFI-specification location of
+@file{/EFI/BOOT/BOOTX64.efi} of the boot directory, usually @file{/boot/efi}.
+This is also useful for some UEFI firmwares that ``forget'' their configuration
+from their non-volatile storage. Like @code{grub-efi-bootloader}, this can only
+be used if the @file{/sys/firmware/efi} directory is available.
+
+@quotation Note
+This @emph{will} overwrite the GRUB file from any other operating systems that
+also place their GRUB file in the UEFI-specification location; making them
+unbootable.
+@end quotation
+
 @item @code{targets}
 This is a list of strings denoting the targets onto which to install the
 bootloader.
@@ -36348,7 +36363,8 @@ The interpretation of targets depends on the bootloader in question.
 For @code{grub-bootloader}, for example, they should be device names
 understood by the bootloader @command{installer} command, such as
 @code{/dev/sda} or @code{(hd0)} (@pxref{Invoking grub-install,,, grub,
-GNU GRUB Manual}).  For @code{grub-efi-bootloader}, they should be mount
+GNU GRUB Manual}).  For @code{grub-efi-bootloader} and
+@code{grub-efi-removable-bootloader} they should be mount
 points of the EFI file system, usually @file{/boot/efi}.  For
 @code{grub-efi-netboot-bootloader}, @code{targets} should be the mount
 points corresponding to TFTP root directories served by your TFTP