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makefile
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makefile
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###############################################################################
# makefile
# by Alex Chadwick, updated by Mohamad Elzohbi to include UART and GPIO object files.
#
# A makefile script for generation of raspberry pi kernel images.
###############################################################################
# The toolchain to use. arm-none-eabi works, but there does exist
# arm-bcm2708-linux-gnueabi.
ARMGNU ?= arm-none-eabi
# The intermediate directory for compiled object files.
BUILD = build/
# The directory in which source files are stored.
SOURCE = source/
# The name of the output file to generate.
TARGET = kernel7.img
# The name of the assembler listing file to generate.
LIST = kernel.list
# The name of the map file to generate.
MAP = kernel.map
# The name of the linker script to use.
LINKER = kernel.ld
# The names of all object files that must be generated. Deduced from the
# assembly code files in source.
OBJECTS := $(patsubst $(SOURCE)%.s,$(BUILD)%.o,$(wildcard $(SOURCE)*.s))
# Rule to make everything.
all: $(TARGET) $(LIST)
# Rule to remake everything. Does not include clean.
rebuild: all
# Rule to make the listing file.
$(LIST) : $(BUILD)output.elf
$(ARMGNU)-objdump -d $(BUILD)output.elf > $(LIST)
# Rule to make the image file.
$(TARGET) : $(BUILD)output.elf
$(ARMGNU)-objcopy $(BUILD)output.elf -O binary $(TARGET)
# Rule to make the elf file.
$(BUILD)output.elf : $(OBJECTS) $(LINKER)
$(ARMGNU)-ld --no-undefined $(OBJECTS) uart.o gpio.o -L. -Map $(MAP) -o $(BUILD)output.elf -T $(LINKER)
# Rule to make the object files.
$(BUILD)%.o: $(SOURCE)%.s
$(ARMGNU)-as -g -mcpu=cortex-a7 -I $(SOURCE) $< -o $@
# Rule to clean files.
clean :
-rm -f $(BUILD)*.o
-rm -f $(BUILD)output.elf
-rm -f $(TARGET)
-rm -f $(LIST)
-rm -f $(MAP)