ar71xx: create new ar71xx/tiny subtarget for 4MB flash devices

This new subtarget sets the small_flash flag and removes unused kernel
configuration.

small_flash removes KERNEL_KALLSYMS, which saves ~107KB in the default
configuration; removing unneeded hardware support from ar71xx/tiny saves
another ~18KB (both after LZMA).

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

1 files changed, 95 insertions, 0 deletions

diff --git a/target/linux/ar71xx/image/common-tp-link.mk b/target/linux/ar71xx/image/common-tp-link.mk
new file mode 100644
index 0000000000..c448c97209
--- /dev/null
+++ b/target/linux/ar71xx/image/common-tp-link.mk
@@ -0,0 +1,95 @@
+DEVICE_VARS += LOADER_FLASH_OFFS TPLINK_BOARD_ID TPLINK_FLASHLAYOUT TPLINK_HEADER_VERSION TPLINK_HWID TPLINK_HWREV
+
+define Build/copy-file
+	cat "$(1)" > "$@"
+endef
+
+define Build/loader-okli
+	dd if=$(KDIR)/loader-$(1).gz bs=7680 conv=sync of="$@.new"
+	cat "$@" >> "$@.new"
+	mv "$@.new" "$@"
+endef
+
+define Build/loader-okli-compile
+	$(call Build/loader-common,FLASH_OFFS=$(LOADER_FLASH_OFFS) FLASH_MAX=0 KERNEL_CMDLINE="$(CMDLINE)")
+endef
+
+# combine kernel and rootfs into one image
+# mktplinkfw <type> <optional extra arguments to mktplinkfw binary>
+# <type> is "sysupgrade" or "factory"
+#
+# -a align the rootfs start on an <align> bytes boundary
+# -j add jffs2 end-of-filesystem markers
+# -s strip padding from end of the image
+# -X reserve <size> bytes in the firmware image (hexval prefixed with 0x)
+define Build/mktplinkfw
+	-$(STAGING_DIR_HOST)/bin/mktplinkfw \
+		-H $(TPLINK_HWID) -W $(TPLINK_HWREV) -F $(TPLINK_FLASHLAYOUT) -N OpenWrt -V $(REVISION) \
+		-m $(TPLINK_HEADER_VERSION) \
+		-k $(IMAGE_KERNEL) \
+		-r $@ \
+		-o $@.new \
+		-j -X 0x40000 \
+		-a $(call rootfs_align,$(FILESYSTEM)) \
+		$(wordlist 2,$(words $(1)),$(1)) \
+		$(if $(findstring sysupgrade,$(word 1,$(1))),-s) && mv $@.new $@ || rm -f $@
+endef
+
+define Build/uImageArcher
+	mkimage -A $(LINUX_KARCH) \
+		-O linux -T kernel \
+		-C $(1) -a $(KERNEL_LOADADDR) -e $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
+		-n '$(call toupper,$(LINUX_KARCH)) OpenWrt Linux-$(LINUX_VERSION)' -d $@ $@.new
+	@mv $@.new $@
+endef
+
+
+define Device/tplink
+  TPLINK_HWREV := 0x1
+  TPLINK_HEADER_VERSION := 1
+  LOADER_TYPE := gz
+  KERNEL := kernel-bin | patch-cmdline | lzma
+  KERNEL_INITRAMFS := kernel-bin | patch-cmdline | lzma | tplink-v1-header
+  IMAGES := sysupgrade.bin factory.bin
+  IMAGE/sysupgrade.bin := append-rootfs | mktplinkfw sysupgrade
+  IMAGE/factory.bin := append-rootfs | mktplinkfw factory
+endef
+
+define Device/tplink-nolzma
+  $(Device/tplink)
+  LOADER_FLASH_OFFS := 0x22000
+  COMPILE := loader-$(1).gz
+  COMPILE/loader-$(1).gz := loader-okli-compile
+  KERNEL := copy-file $(KDIR)/vmlinux.bin.lzma | uImage lzma -M 0x4f4b4c49 | loader-okli $(1)
+  KERNEL_INITRAMFS := copy-file $(KDIR)/vmlinux-initramfs.bin.lzma | loader-kernel-cmdline | tplink-v1-header
+endef
+
+define Device/tplink-4m
+  $(Device/tplink-nolzma)
+  TPLINK_FLASHLAYOUT := 4M
+  IMAGE_SIZE := 3904k
+endef
+
+define Device/tplink-8m
+  $(Device/tplink-nolzma)
+  TPLINK_FLASHLAYOUT := 8M
+  IMAGE_SIZE := 7936k
+endef
+
+define Device/tplink-4mlzma
+  $(Device/tplink)
+  TPLINK_FLASHLAYOUT := 4Mlzma
+  IMAGE_SIZE := 3904k
+endef
+
+define Device/tplink-8mlzma
+  $(Device/tplink)
+  TPLINK_FLASHLAYOUT := 8Mlzma
+  IMAGE_SIZE := 7936k
+endef
+
+define Device/tplink-16mlzma
+  $(Device/tplink)
+  TPLINK_FLASHLAYOUT := 16Mlzma
+  IMAGE_SIZE := 15872k
+endef