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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/guix.texi | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 50c4984d71..617b8463e3 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -40982,8 +40982,8 @@ QEMU monitor and the VM. @cindex image, creating disk images The @code{image} command can produce various image types. The image type can be selected using the @option{--image-type} option. It -defaults to @code{mbr-raw}. When its value is @code{iso9660}, the -@option{--label} option can be used to specify a volume ID with +defaults to @code{mbr-hybrid-raw}. When its value is @code{iso9660}, +the @option{--label} option can be used to specify a volume ID with @code{image}. By default, the root file system of a disk image is mounted non-volatile; the @option{--volatile} option can be provided to make it volatile instead. When using @code{image}, the bootloader @@ -41001,8 +41001,8 @@ qemu-system-x86_64 -enable-kvm -hda /tmp/my-image.qcow2 -m 1000 \ -bios $(guix build ovmf)/share/firmware/ovmf_x64.bin @end example -When using the @code{mbr-raw} image type, a raw disk image is produced; -it can be copied as is to a USB stick, for instance. Assuming +When using the @code{mbr-hybrid-raw} image type, a raw disk image is +produced; it can be copied as is to a USB stick, for instance. Assuming @code{/dev/sdc} is the device corresponding to a USB stick, one can copy the image to it using the following command: @@ -41139,7 +41139,7 @@ of the image. For the @code{image} action, create an image with given @var{type}. When this option is omitted, @command{guix system} uses the -@code{mbr-raw} image type. +@code{mbr-hybrid-raw} image type. @cindex ISO-9660 format @cindex CD image format @@ -45347,7 +45347,7 @@ then directly boot from it, without any kind of installation procedure. The @command{guix system image} command is able to turn an operating system definition into a bootable image. This command supports -different image types, such as @code{mbr-raw}, @code{iso9660} and +different image types, such as @code{mbr-hybrid-raw}, @code{iso9660} and @code{docker}. Any modern @code{x86_64} machine will probably be able to boot from an @code{iso9660} image. However, there are a few machines out there that require specific image types. Those machines, in general @@ -45611,8 +45611,24 @@ from them to simplify the @code{image} definition. The @code{(gnu system image)} module provides the following @code{image} definition variables. +@defvar mbr-disk-image +An MBR disk-image composed of a single ROOT partition. The ROOT +partition starts at a 1@tie{}MiB offset so that the bootloader can +install itself in the post-MBR gap. +@end defvar + +@defvar mbr-hybrid-disk-image +An MBR disk-image composed of two partitions: a 64 bits ESP partition +and a ROOT boot partition. The ESP partition starts at a 1@tie{}MiB +offset so that a BIOS compatible bootloader can install itself in the +post-MBR gap. The image can be used by @code{x86_64} and @code{i686} +machines supporting only legacy BIOS booting. The ESP partition ensures +that it can also be used by newer machines relying on UEFI booting, +hence the @emph{hybrid} denomination. +@end defvar + @defvar efi-disk-image -A MBR disk-image composed of two partitions: a 64 bits ESP partition and +A GPT disk-image composed of two partitions: a 64 bits ESP partition and a ROOT boot partition. This image can be used on most @code{x86_64} and @code{i686} machines, supporting BIOS or UEFI booting. @end defvar @@ -45703,6 +45719,10 @@ system image)} and the @code{(gnu system images @dots{})} modules. Build an image based on the @code{mbr-disk-image} image. @end defvar +@defvar mbr-hybrid-raw-image-type +Build an image based on the @code{mbr-hybrid-disk-image} image. +@end defvar + @defvar efi-raw-image-type Build an image based on the @code{efi-disk-image} image. @end defvar |