The generic 'efi-disk-image' needs to be bootable on systems without EFI. To
do that, GRUB is installed in the post-MBR gap. Make sure that the first
partition starts with an offset, to make this gap large enough for GRUB.
* gnu/system/image.scm (root-offset, root-label): New variables,
(esp-partition): use 'root-offset' as the partition offset,
(root-partition): use 'root-label' as the partition label.
;;; Images definitions.
;;;
+;; This is the offset before the first partition. GRUB will install itself in
+;; this post-MBR gap.
+(define root-offset (* 512 2048))
+
+;; Generic root partition label.
+(define root-label "Guix_image")
+
(define esp-partition
(partition
(size (* 40 (expt 2 20)))
+ (offset root-offset)
(label "GNU-ESP") ;cosmetic only
;; Use "vfat" here since this property is used when mounting. The actual
;; FAT-ness is based on file system size (16 in this case).
(define root-partition
(partition
(size 'guess)
- (label "Guix_image")
+ (label root-label)
(file-system "ext4")
(flags '(boot))
(initializer (gexp initialize-root-partition))))