images: Add pine64 support.

* gnu/system/images/pine64.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/system/image.scm (arm64-disk-image, arm64-image-type): New variables.

gnu/local.mk

@@ -646,6 +646,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/system/vm.scm				\
 						\
   %D%/system/images/hurd.scm			\
+  %D%/system/images/pine64.scm			\
 						\
   %D%/machine.scm				\
 						\

gnu/system/image.scm

@@ -65,12 +65,14 @@
 
             efi-disk-image
             iso9660-image
+            arm64-disk-image
 
             image-with-os
             raw-image-type
             qcow2-image-type
             iso-image-type
             uncompressed-iso-image-type
+            arm64-image-type
 
             image-with-label
             system-image
@@ -123,6 +125,18 @@
            (label "GUIX_IMAGE")
            (flags '(boot)))))))
 
+(define arm64-disk-image
+  (image
+   (format 'disk-image)
+   (target "aarch64-linux-gnu")
+   (partitions
+    (list (partition
+           (inherit root-partition)
+           (offset root-offset))))
+   ;; FIXME: Deleting and creating "/var/run" and "/tmp" on the overlayfs
+   ;; fails.
+   (volatile-root? #f)))
+
 
 ;;;
 ;;; Images types.
@@ -164,6 +178,11 @@ set to the given OS."
                   (compression? #f))
                  <>))))
 
+(define arm64-image-type
+  (image-type
+   (name 'arm)
+   (constructor (cut image-with-os arm64-disk-image <>))))
+
 
 ;;
 ;; Helpers.

gnu/system/images/pine64.scm

@@ -0,0 +1,59 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu system images pine64)
+  #:use-module (gnu bootloader)
+  #:use-module (gnu bootloader u-boot)
+  #:use-module (gnu image)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu system)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system image)
+  #:use-module (srfi srfi-26)
+  #:export (pine64-barebones-os
+            pine64-image-type))
+
+(define pine64-barebones-os
+  (operating-system
+    (host-name "vignemale")
+    (timezone "Europe/Paris")
+    (locale "en_US.utf8")
+    (bootloader (bootloader-configuration
+                 (bootloader u-boot-pine64-lts-bootloader)
+                 (target "/dev/vda")))
+    (initrd-modules '())
+    (kernel linux-libre-arm64-generic)
+    (file-systems (cons (file-system
+                          (device (file-system-label "my-root"))
+                          (mount-point "/")
+                          (type "ext4"))
+                        %base-file-systems))
+    (services (cons (service agetty-service-type
+                             (agetty-configuration
+                              (extra-options '("-L")) ; no carrier detect
+                              (baud-rate "115200")
+                              (term "vt100")
+                              (tty "ttyS0")))
+                    %base-services))))
+
+(define pine64-image-type
+  (image-type
+   (name 'pine64-raw)
+   (constructor (cut image-with-os arm64-disk-image <>))))