Edited git ignore. Target can now build without any errors'!'

Default/boot/subdir.mk

@@ -0,0 +1,21 @@
+################################################################################
+# Automatically-generated file. Do not edit!
+################################################################################
+
+# Add inputs and outputs from these tool invocations to the build variables 
+S_UPPER_SRCS += \
+../boot/startup_stm32f4xx.S 
+
+OBJS += \
+./boot/startup_stm32f4xx.o 
+
+
+# Each subdirectory must supply rules for building sources it contributes
+boot/%.o: ../boot/%.S
+	@echo 'Building file: $<'
+	@echo 'Invoking: Cross GCC Assembler'
+	arm-none-eabi-as  -o "$@" "$<"
+	@echo 'Finished building: $<'
+	@echo ' '
+
+