system: Add wandboard installer.

* gnu/bootloader/u-boot.scm (u-boot-wandboard-bootloader):
  New exported variable.
* gnu/system/install.scm (wandboard-installation-os):
  New exported variable.

gnu/bootloader/u-boot.scm

@@ -34,7 +34,8 @@
             u-boot-banana-pi-m2-ultra-bootloader
             u-boot-beaglebone-black-bootloader
             u-boot-mx6cuboxi-bootloader
-            u-boot-nintendo-nes-classic-edition-bootloader))
+            u-boot-nintendo-nes-classic-edition-bootloader
+            u-boot-wandboard-bootloader))
 
 (define install-u-boot
   #~(lambda (bootloader device mount-point)
@@ -130,3 +131,8 @@
   (bootloader
    (inherit u-boot-imx-bootloader)
    (package u-boot-mx6cuboxi)))
+
+(define u-boot-wandboard-bootloader
+  (bootloader
+   (inherit u-boot-imx-bootloader)
+   (package u-boot-wandboard)))

gnu/system/install.scm

@@ -50,7 +50,8 @@
             banana-pi-m2-ultra-installation-os
             beaglebone-black-installation-os
             mx6cuboxi-installation-os
-            nintendo-nes-classic-edition-installation-os))
+            nintendo-nes-classic-edition-installation-os
+            wandboard-installation-os))
 
 ;;; Commentary:
 ;;;
@@ -440,6 +441,11 @@ The bootloader BOOTLOADER is installed to BOOTLOADER-TARGET."
                             "/dev/mmcblk0" ; SD card (solder it yourself)
                             "ttyS0"))
 
+(define wandboard-installation-os
+  (embedded-installation-os u-boot-wandboard-bootloader
+                            "/dev/mmcblk0" ; SD card storage
+                            "ttymxc0"))
+
 ;; Return the default os here so 'guix system' can consume it directly.
 installation-os