Fix build, small proto tweak.

car_fmw/Makefile

@@ -42,9 +42,12 @@ $(CAR_FMW_ELF): $(CAR_FMW_OBJ) $(LIB_STM32F4D_OBJ) \
 	$(LIB_CMSIS_OBJ) $(LIB_STDPERIPH_OBJ)
 	$(CC) $(CFLAGS) $^ -T $(SRC_DIR)/stm32_flash.ld -o $@
 
-$(CAR_FMW_OBJ): $(call dircs_to_prefxd_objs,$(SRC_DIR))
+$(CAR_FMW_OBJ): $(BIN_DIR) $(call dircs_to_prefxd_objs,$(SRC_DIR))
 	$(LD_ALL_DEPS)
 
+$(BIN_DIR):
+	mkdir -p $(BIN_DIR)
+
 $(BIN_DIR)/%.o: $(SRC_DIR)/%.c
 	$(CC_ALL_DEPS)
 

proto/carkot.proto

@@ -2,6 +2,7 @@ message Upload {
   message Method {
     enum TYPE {
       DFU = 1;
+      STLINK = 2;
     }
     // Type of upload method.
     optional TYPE type = 1;
@@ -14,8 +15,10 @@ message Upload {
   }
   // Firmware data.
   optional bytes data = 1;
+  // Firmware load address (string, to avoid 64-bit woes).
+  optional string base = 2;
   // Method of firmware upload.
-  optional Method method = 2;
+  optional Method method = 3;
 }
 
 message UploadResult {