esp8266: deploy: Use --flash_size=8m option to esptool.py.

Most esp8266 modules have at least 1MB (8Mbit) of flash. If not set, vendor
functions allow to access only first 512K.

esp8266/Makefile

@@ -148,7 +148,7 @@ $(BUILD)/frozen.c: $(wildcard $(SCRIPTDIR)/*) $(CONFVARS_FILE)
 deploy: $(BUILD)/firmware-combined.bin
 	$(ECHO) "Writing $< to the board"
 	#$(Q)esptool.py --port $(PORT) write_flash 0 $<
-	$(Q)esptool.py --port $(PORT) --baud $(BAUD) write_flash 0 $(BUILD)/firmware.elf-0x00000.bin 0x10000 $(BUILD)/firmware.elf-0x10000.bin
+	$(Q)esptool.py --port $(PORT) --baud $(BAUD) write_flash --flash_size=8m 0 $(BUILD)/firmware.elf-0x00000.bin 0x10000 $(BUILD)/firmware.elf-0x10000.bin
 
 reset:
 	echo -e "\r\nimport pyb; pyb.hard_reset()\r\n" >$(PORT)