ramips: lzma-loader: make FLASH_START configurable

FLASH_START is supposed to point at the memory area where NOR flash are
mapped. We currently have an incorrect FLASH_START copied from ar71xx
back then and the loader doesn't work under OKLI mode.
On ramips, mt7621 has it's flash mapped to 0x1fc00000 and other SoCs
uses 0x1c000000. This commit makes FLASH_START a configurable value to
handle both cases.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ramips/image/lzma-loader/Makefile

@@ -13,6 +13,7 @@ LOADER		:= loader.bin
 LOADER_NAME	:= $(basename $(notdir $(LOADER)))
 LOADER_DATA 	:=
 TARGET_DIR	:=
+FLASH_START	:=
 FLASH_OFFS	:=
 FLASH_MAX	:=
 BOARD		:=
@@ -40,6 +41,7 @@ loader-compile: $(PKG_BUILD_DIR)/.prepared
 	$(MAKE) -C $(PKG_BUILD_DIR) CROSS_COMPILE="$(TARGET_CROSS)" \
 		LZMA_TEXT_START=$(LZMA_TEXT_START) \
 		LOADER_DATA=$(LOADER_DATA) \
+		FLASH_START=$(FLASH_START) \
 		FLASH_OFFS=$(FLASH_OFFS) \
 		FLASH_MAX=$(FLASH_MAX) \
 		BOARD="$(BOARD)" \

target/linux/ramips/image/lzma-loader/src/Makefile

@@ -19,6 +19,7 @@ LOADADDR	:=
 LZMA_TEXT_START	:= 0x80a00000
 LOADER_DATA	:=
 BOARD		:=
+FLASH_START	:=
 FLASH_OFFS	:=
 FLASH_MAX	:=
 PLATFORM	:=
@@ -64,6 +65,10 @@ ifneq ($(strip $(KERNEL_CMDLINE)),)
 CFLAGS		+= -DCONFIG_KERNEL_CMDLINE='"$(KERNEL_CMDLINE)"'
 endif
 
+ifneq ($(strip $(FLASH_START)),)
+CFLAGS		+= -DCONFIG_FLASH_START=$(FLASH_START)
+endif
+
 ifneq ($(strip $(FLASH_OFFS)),)
 CFLAGS		+= -DCONFIG_FLASH_OFFS=$(FLASH_OFFS)
 endif

target/linux/ramips/image/lzma-loader/src/loader.c

@@ -28,9 +28,6 @@
 #include "printf.h"
 #include "LzmaDecode.h"
 
-#define AR71XX_FLASH_START	0x1f000000
-#define AR71XX_FLASH_END	0x1fe00000
-
 #define KSEG0			0x80000000
 #define KSEG1			0xa0000000
 
@@ -178,7 +175,7 @@ static void lzma_init_data(void)
 	unsigned long kernel_ofs;
 	unsigned long kernel_size;
 
-	flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
+	flash_base = (unsigned char *) KSEG1ADDR(CONFIG_FLASH_START);
 
 	printf("Looking for OpenWrt image... ");