ath79-mikrotik: add support for Mikrotik RB951Ui-2nD (#2377)

Re-add mikrotik target

Note that previous images were generic ones and as such no migration
path is provided other than manually flashing the image via config-mode.

.github/filters.yml

@@ -17,6 +17,16 @@
     "targets/generic",
     "targets/targets.mk"
   ],
+  "ath79-mikrotik": [
+    "targets/ath79-mikrotik",
+    "modules",
+    "Makefile",
+    "patches/**",
+    "scripts/**",
+    "targets/generic",
+    "targets/targets.mk",
+    "targets/mikrotik.inc"
+  ],
   "bcm27xx-bcm2708": [
     "targets/bcm27xx-bcm2708",
     "modules",

docs/user/supported_devices.rst

@@ -118,6 +118,13 @@ ath79-nand
   - GL-AR300M
   - GL-AR750S
 
+ath79-mikrotik
+--------------
+
+* Mikrotik
+
+  - RB951Ui-2nD (hAP)
+
 brcm2708-bcm2708
 ----------------
 

targets/ath79-mikrotik

+include 'mikrotik.inc'
+
+device('mikrotik-routerboard-951ui-2nd-hap', 'mikrotik_routerboard-951ui-2nd')

targets/mikrotik.inc

+-- Mikrotik images are netbooted via TFTP, then persisted with sysupgrade
+defaults {
+	factory = '-initramfs-kernel'
+}
+
+config('TARGET_ROOTFS_INITRAMFS', true)
+config('TARGET_INITRAMFS_COMPRESSION_LZMA', true)

targets/targets.mk

 $(eval $(call GluonTarget,ath79,generic))
 $(eval $(call GluonTarget,ath79,nand))
+$(eval $(call GluonTarget,ath79,mikrotik))
 $(eval $(call GluonTarget,bcm27xx,bcm2708))
 $(eval $(call GluonTarget,bcm27xx,bcm2709))
 $(eval $(call GluonTarget,ipq40xx,generic))