diff --git a/target/linux/apm821xx/image/Makefile b/target/linux/apm821xx/image/Makefile
index c26c015751..1b7c466a44 100644
--- a/target/linux/apm821xx/image/Makefile
+++ b/target/linux/apm821xx/image/Makefile
@@ -34,14 +34,6 @@ define Build/copy-file
 	cat "$(1)" > "$@"
 endef
 
-define Build/create-uImage-dtb
-	# flat_dt target expect FIT image - which WNDR4700's uboot doesn't support
-	-$(STAGING_DIR_HOST)/bin/mkimage -A $(LINUX_KARCH) \
-		-O linux -T kernel -C none \
-		-n '$(call toupper,$(LINUX_KARCH)) $(VERSION_DIST) Linux-$(LINUX_VERSION)' \
-		-d "$@.dtb" "$@.dtb.uimage"
-endef
-
 define Build/dtb
 	$(call Image/BuildDTB,../dts/$(DEVICE_DTS).dts,$@.dtb,,--space $(DTB_SIZE))
 endef
@@ -50,27 +42,6 @@ define Build/export-dtb
 	cp $(IMAGE_KERNEL).dtb $@
 endef
 
-define Build/hdd-img
-	./mbl_gen_hdd_img.sh $@ $@.boot $(IMAGE_ROOTFS) $(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
-endef
-
-define Build/MerakiAdd-dtb
-	$(call Image/BuildDTB,../dts/$(DEVICE_DTS).dts,$@.dtb)
-	( \
-		dd if=$@.dtb bs=$(DTB_SIZE) conv=sync; \
-		cat $@ ; \
-	) > $@.new
-	@mv $@.new $@
-endef
-
-define Build/MerakiNAND
-	-$(STAGING_DIR_HOST)/bin/mkmerakifw \
-		-B $(BOARD_NAME) -s \
-		-i $@ \
-		-o $@.new
-	@cp $@.new $@
-endef
-
 define Build/MuImage-initramfs
 	rm -rf $@.fakerd $@.new
 
@@ -119,134 +90,6 @@ define Device/Default
   SUPPORTED_DEVICES = $(subst _,$(comma),$(1))
 endef
 
-ifeq ($(SUBTARGET),nand)
-
-define Device/meraki_mr24
-  DEVICE_VENDOR := Cisco Meraki
-  DEVICE_MODEL := MR24
-  DEVICE_PACKAGES := kmod-spi-gpio -swconfig
-  BOARD_NAME := mr24
-  DEVICE_DTS := meraki-mr24
-  IMAGES := sysupgrade.bin
-  DTB_SIZE := 64512
-  IMAGE_SIZE := 8191k
-  KERNEL := kernel-bin | lzma | uImage lzma | MerakiAdd-dtb | MerakiNAND
-  KERNEL_INITRAMFS := kernel-bin | lzma | dtb | MuImage-initramfs lzma
-  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
-  UBINIZE_OPTS := -E 5
-  SUPPORTED_DEVICES += mr24
-endef
-TARGET_DEVICES += meraki_mr24
-
-define Device/meraki_mx60
-  DEVICE_VENDOR := Cisco Meraki
-  DEVICE_MODEL := MX60/MX60W
-  DEVICE_PACKAGES := kmod-spi-gpio kmod-usb-ledtrig-usbport kmod-usb-dwc2 \
-		     kmod-usb-storage block-mount
-  BOARD_NAME := mx60
-  DEVICE_DTS := meraki-mx60
-  BLOCKSIZE := 63k
-  IMAGES := sysupgrade.bin
-  DTB_SIZE := 64512
-  IMAGE_SIZE := 1021m
-  KERNEL_SIZE := 4031k
-  KERNEL := kernel-bin | gzip | uImage gzip | MerakiAdd-dtb | MerakiNAND
-  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
-  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
-  UBINIZE_OPTS := -E 5
-  SUPPORTED_DEVICES += mx60
-endef
-TARGET_DEVICES += meraki_mx60
-
-define Device/netgear_wndap6x0
-  DEVICE_VENDOR := NETGEAR
-  DEVICE_PACKAGES := kmod-eeprom-at24
-  SUBPAGESIZE := 256
-  PAGESIZE := 512
-  BLOCKSIZE := 16k
-  DTB_SIZE := 32768
-  IMAGE_SIZE := 27392k
-  IMAGES := sysupgrade.bin factory.img
-  KERNEL_SIZE := 4032k
-  KERNEL := dtb | kernel-bin | gzip | MuImage-initramfs gzip
-  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
-  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi
-  UBINIZE_OPTS := -E 5
-endef
-
-define Device/netgear_wndap620
-  $(Device/netgear_wndap6x0)
-  DEVICE_MODEL := WNDAP620 (Premium Wireless-N)
-  DEVICE_DTS := netgear-wndap620
-endef
-TARGET_DEVICES += netgear_wndap620
-
-define Device/netgear_wndap660
-  $(Device/netgear_wndap6x0)
-  DEVICE_MODEL := WNDAP660 (Dual Radio Dual Band Wireless-N)
-  DEVICE_DTS := netgear-wndap660
-endef
-TARGET_DEVICES += netgear_wndap660
-
-define Device/netgear_wndr4700
-  DEVICE_VENDOR := NETGEAR
-  DEVICE_MODEL := Centria N900 WNDR4700/WNDR4720
-  DEVICE_PACKAGES := badblocks block-mount e2fsprogs kmod-hwmon-drivetemp \
-	kmod-dm kmod-fs-ext4 kmod-fs-vfat kmod-usb-ledtrig-usbport \
-	kmod-md-mod kmod-nls-cp437 kmod-nls-iso8859-1 kmod-nls-iso8859-15 \
-	kmod-nls-utf8 kmod-usb3 kmod-usb-dwc2 kmod-usb-storage \
-	partx-utils
-  BOARD_NAME := wndr4700
-  DEVICE_DTS := netgear-wndr4700
-  PAGESIZE := 2048
-  SUBPAGESIZE := 512
-  BLOCKSIZE := 128k
-  DTB_SIZE := 131008
-  IMAGE_SIZE := 24960k
-  IMAGES := factory.img sysupgrade.bin
-  ARTIFACTS := device-tree.dtb
-  KERNEL_SIZE := 3584k
-  # append a fake/empty rootfs to fool netgear's uboot
-  # CHECK_DNI_FIRMWARE_ROOTFS_INTEGRITY in do_chk_dniimg()
-  KERNEL := kernel-bin | lzma | uImage lzma | pad-offset $$(BLOCKSIZE) 64 | \
-	    append-uImage-fakehdr filesystem | dtb | create-uImage-dtb | prepend-dtb
-  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
-  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi | \
-		       netgear-dni | check-size
-  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
-  ARTIFACT/device-tree.dtb := export-dtb | uImage none
-  NETGEAR_BOARD_ID := WNDR4700
-  NETGEAR_HW_ID := 29763875+128+256
-  UBINIZE_OPTS := -E 5
-  SUPPORTED_DEVICES += wndr4700
-endef
-TARGET_DEVICES += netgear_wndr4700
-
-endif
-
-ifeq ($(SUBTARGET),sata)
-
-define Device/wd_mybooklive
-  DEVICE_VENDOR := Western Digital
-  DEVICE_MODEL := My Book Live Series (Single + Duo)
-  DEVICE_PACKAGES := kmod-usb-dwc2 kmod-usb-ledtrig-usbport kmod-usb-storage kmod-fs-vfat wpad-basic
-  DEVICE_DTS := wd-mybooklive
-  SUPPORTED_DEVICES += mbl wd,mybooklive-duo
-  BLOCKSIZE := 1k
-  DTB_SIZE := 16384
-  KERNEL := kernel-bin | dtb | gzip | uImage gzip
-  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
-  IMAGES := factory.img.gz sysupgrade.img.gz
-  ARTIFACTS := apollo3g.dtb
-  DEVICE_DTB := apollo3g.dtb
-  FILESYSTEMS := ext4 squashfs
-  IMAGE/factory.img.gz := boot-script | boot-img | hdd-img | gzip
-  IMAGE/sysupgrade.img.gz := boot-script | boot-img | hdd-img | gzip | append-metadata
-  ARTIFACT/apollo3g.dtb := export-dtb
-endef
-
-TARGET_DEVICES += wd_mybooklive
-
-endif
+include $(SUBTARGET).mk
 
 $(eval $(call BuildImage))
diff --git a/target/linux/apm821xx/image/nand.mk b/target/linux/apm821xx/image/nand.mk
new file mode 100644
index 0000000000..a7338e79a0
--- /dev/null
+++ b/target/linux/apm821xx/image/nand.mk
@@ -0,0 +1,126 @@
+define Build/create-uImage-dtb
+	# flat_dt target expect FIT image - which WNDR4700's uboot doesn't support
+	-$(STAGING_DIR_HOST)/bin/mkimage -A $(LINUX_KARCH) \
+		-O linux -T kernel -C none \
+		-n '$(call toupper,$(LINUX_KARCH)) $(VERSION_DIST) Linux-$(LINUX_VERSION)' \
+		-d "$@.dtb" "$@.dtb.uimage"
+endef
+
+define Build/MerakiAdd-dtb
+	$(call Image/BuildDTB,../dts/$(DEVICE_DTS).dts,$@.dtb)
+	( \
+		dd if=$@.dtb bs=$(DTB_SIZE) conv=sync; \
+		cat $@ ; \
+	) > $@.new
+	@mv $@.new $@
+endef
+
+define Build/MerakiNAND
+	-$(STAGING_DIR_HOST)/bin/mkmerakifw \
+		-B $(BOARD_NAME) -s \
+		-i $@ \
+		-o $@.new
+	@cp $@.new $@
+endef
+
+
+define Device/meraki_mr24
+  DEVICE_VENDOR := Cisco Meraki
+  DEVICE_MODEL := MR24
+  DEVICE_PACKAGES := kmod-spi-gpio -swconfig
+  BOARD_NAME := mr24
+  DEVICE_DTS := meraki-mr24
+  IMAGES := sysupgrade.bin
+  DTB_SIZE := 64512
+  IMAGE_SIZE := 8191k
+  KERNEL := kernel-bin | lzma | uImage lzma | MerakiAdd-dtb | MerakiNAND
+  KERNEL_INITRAMFS := kernel-bin | lzma | dtb | MuImage-initramfs lzma
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  UBINIZE_OPTS := -E 5
+  SUPPORTED_DEVICES += mr24
+endef
+TARGET_DEVICES += meraki_mr24
+
+define Device/meraki_mx60
+  DEVICE_VENDOR := Cisco Meraki
+  DEVICE_MODEL := MX60/MX60W
+  DEVICE_PACKAGES := kmod-spi-gpio kmod-usb-ledtrig-usbport kmod-usb-dwc2 \
+		     kmod-usb-storage block-mount
+  BOARD_NAME := mx60
+  DEVICE_DTS := meraki-mx60
+  BLOCKSIZE := 63k
+  IMAGES := sysupgrade.bin
+  DTB_SIZE := 64512
+  IMAGE_SIZE := 1021m
+  KERNEL_SIZE := 4031k
+  KERNEL := kernel-bin | gzip | uImage gzip | MerakiAdd-dtb | MerakiNAND
+  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  UBINIZE_OPTS := -E 5
+  SUPPORTED_DEVICES += mx60
+endef
+TARGET_DEVICES += meraki_mx60
+
+define Device/netgear_wndap6x0
+  DEVICE_VENDOR := NETGEAR
+  DEVICE_PACKAGES := kmod-eeprom-at24
+  SUBPAGESIZE := 256
+  PAGESIZE := 512
+  BLOCKSIZE := 16k
+  DTB_SIZE := 32768
+  IMAGE_SIZE := 27392k
+  IMAGES := sysupgrade.bin factory.img
+  KERNEL_SIZE := 4032k
+  KERNEL := dtb | kernel-bin | gzip | MuImage-initramfs gzip
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi
+  UBINIZE_OPTS := -E 5
+endef
+
+define Device/netgear_wndap620
+  $(Device/netgear_wndap6x0)
+  DEVICE_MODEL := WNDAP620 (Premium Wireless-N)
+  DEVICE_DTS := netgear-wndap620
+endef
+TARGET_DEVICES += netgear_wndap620
+
+define Device/netgear_wndap660
+  $(Device/netgear_wndap6x0)
+  DEVICE_MODEL := WNDAP660 (Dual Radio Dual Band Wireless-N)
+  DEVICE_DTS := netgear-wndap660
+endef
+TARGET_DEVICES += netgear_wndap660
+
+define Device/netgear_wndr4700
+  DEVICE_VENDOR := NETGEAR
+  DEVICE_MODEL := Centria N900 WNDR4700/WNDR4720
+  DEVICE_PACKAGES := badblocks block-mount e2fsprogs kmod-hwmon-drivetemp \
+	kmod-dm kmod-fs-ext4 kmod-fs-vfat kmod-usb-ledtrig-usbport \
+	kmod-md-mod kmod-nls-cp437 kmod-nls-iso8859-1 kmod-nls-iso8859-15 \
+	kmod-nls-utf8 kmod-usb3 kmod-usb-dwc2 kmod-usb-storage \
+	partx-utils
+  BOARD_NAME := wndr4700
+  DEVICE_DTS := netgear-wndr4700
+  PAGESIZE := 2048
+  SUBPAGESIZE := 512
+  BLOCKSIZE := 128k
+  DTB_SIZE := 131008
+  IMAGE_SIZE := 24960k
+  IMAGES := factory.img sysupgrade.bin
+  ARTIFACTS := device-tree.dtb
+  KERNEL_SIZE := 3584k
+  # append a fake/empty rootfs to fool netgear's uboot
+  # CHECK_DNI_FIRMWARE_ROOTFS_INTEGRITY in do_chk_dniimg()
+  KERNEL := kernel-bin | lzma | uImage lzma | pad-offset $$(BLOCKSIZE) 64 | \
+	    append-uImage-fakehdr filesystem | dtb | create-uImage-dtb | prepend-dtb
+  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
+  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi | \
+		       netgear-dni | check-size
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  ARTIFACT/device-tree.dtb := export-dtb | uImage none
+  NETGEAR_BOARD_ID := WNDR4700
+  NETGEAR_HW_ID := 29763875+128+256
+  UBINIZE_OPTS := -E 5
+  SUPPORTED_DEVICES += wndr4700
+endef
+TARGET_DEVICES += netgear_wndr4700
diff --git a/target/linux/apm821xx/image/sata.mk b/target/linux/apm821xx/image/sata.mk
new file mode 100644
index 0000000000..444b2441f0
--- /dev/null
+++ b/target/linux/apm821xx/image/sata.mk
@@ -0,0 +1,25 @@
+define Build/hdd-img
+	./mbl_gen_hdd_img.sh $@ $@.boot $(IMAGE_ROOTFS) $(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
+endef
+
+
+define Device/wd_mybooklive
+  DEVICE_VENDOR := Western Digital
+  DEVICE_MODEL := My Book Live Series (Single + Duo)
+  DEVICE_PACKAGES := kmod-usb-dwc2 kmod-usb-ledtrig-usbport kmod-usb-storage kmod-fs-vfat wpad-basic
+  DEVICE_DTS := wd-mybooklive
+  SUPPORTED_DEVICES += mbl wd,mybooklive-duo
+  BLOCKSIZE := 1k
+  DTB_SIZE := 16384
+  KERNEL := kernel-bin | dtb | gzip | uImage gzip
+  KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
+  IMAGES := factory.img.gz sysupgrade.img.gz
+  ARTIFACTS := apollo3g.dtb
+  DEVICE_DTB := apollo3g.dtb
+  FILESYSTEMS := ext4 squashfs
+  IMAGE/factory.img.gz := boot-script | boot-img | hdd-img | gzip
+  IMAGE/sysupgrade.img.gz := boot-script | boot-img | hdd-img | gzip | append-metadata
+  ARTIFACT/apollo3g.dtb := export-dtb
+endef
+
+TARGET_DEVICES += wd_mybooklive