Merge branch 'bugfix/fix_ota_bin_error' into 'master'

ota: fix OTA binary which is to be flashed error

See merge request sdk/ESP8266_RTOS_SDK!1061

Author: donghengqaz

components/esp8266/Makefile.projbuild

@@ -119,13 +119,14 @@ app2-flash-all: app2
 	@$(ESPTOOLPY_WRITE_FLASH) $(patsubst $(APP_OFFSET),$(APP2_OFFSET),$(ESPTOOL_ALL_FLASH_ARGS))
 
 $(OTA1_BIN): all_binaries
+	@cp $(RAW_BIN) $(RAW_BIN).old
 	@cp $(RAW_BIN) $(OTA1_BIN)
 	@echo [GEN] $(OTA1_BIN)
 
 $(OTA2_BIN): $(OTA1_BIN)
 ifdef __COMBILE_OTA_BIN
 	@rm -f ./build/esp8266/esp8266_out.ld
-	@export CFLAGS= && export CXXFLAGS= && make APP_OFFSET=$(APP2_OFFSET) APP_SIZE=$(APP2_SIZE)
+	@export CFLAGS= && export CXXFLAGS= && make $(APP_BIN) APP_OFFSET=$(APP2_OFFSET) APP_SIZE=$(APP2_SIZE)
 endif
 	@cp $(RAW_BIN) $(OTA2_BIN)
 	@echo [GEN] $(OTA2_BIN)
@@ -150,6 +151,8 @@ ifdef CONFIG_ESP8266_OTA_FROM_OLD
 ota: $(OTA_V2_TO_V3_BIN)
 else
 ota: $(OTA_BIN)
+	@cp $(RAW_BIN).old $(RAW_BIN)
+	@rm $(RAW_BIN).old
 endif
 
 ota-clean: