[openwrt/openwrt] ramips: image: add recipe for OKLI loader

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/b7013e9c4ad3b6944ac5a028d8ae9350be0859f0

commit b7013e9c4ad3b6944ac5a028d8ae9350be0859f0
Author: Chuanhong Guo <gch981213 at gmail.com>
AuthorDate: Wed Sep 2 14:22:30 2020 +0800

    ramips: image: add recipe for OKLI loader
    
    Signed-off-by: Chuanhong Guo <gch981213 at gmail.com>
---
 target/linux/ramips/image/Makefile | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index f5166f8ae1..10e9edd3bb 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 
-DEVICE_VARS += LOADER_TYPE
+DEVICE_VARS += LOADER_TYPE LOADER_FLASH_OFFS
 DEVICE_VARS += NETGEAR_BOARD_ID NETGEAR_HW_ID
 DEVICE_VARS += BUFFALO_TAG_PLATFORM BUFFALO_TAG_VERSION BUFFALO_TAG_MINOR
 DEVICE_VARS += SEAMA_SIGNATURE SEAMA_MTDBLOCK
@@ -21,8 +21,12 @@ loadaddr-$(CONFIG_TARGET_ramips_mt7621) := 0x80001000
 ldrplatform-y := ralink
 ldrplatform-$(CONFIG_TARGET_ramips_mt7621) := mt7621
 
+ldrflashstart-y := 0x1c000000
+ldrflashstart-$(CONFIG_TARGET_ramips_mt7621) := 0x1fc00000
+
 KERNEL_LOADADDR := $(loadaddr-y)
 LOADER_PLATFORM := $(ldrplatform-y)
+LOADER_FLASH_START := $(ldrflashstart-y)
 
 KERNEL_DTB = kernel-bin | append-dtb | lzma
 
@@ -74,6 +78,18 @@ define Build/loader-kernel
 	$(call Build/loader-common,LOADER_DATA="$@")
 endef
 
+define Build/loader-okli-compile
+	$(call Build/loader-common, \
+		FLASH_START=$(LOADER_FLASH_START) \
+		FLASH_OFFS=$(LOADER_FLASH_OFFS) \
+		FLASH_MAX=0 \
+	)
+endef
+
+define Build/append-loader-okli
+	cat "$(KDIR)/loader-$(word 1,$(1)).$(LOADER_TYPE)" >> "$@"
+endef
+
 # combine kernel and rootfs into one image
 # mkdlinkfw <type> <optional extra arguments to mkdlinkfw binary>
 define Build/mkdlinkfw