自己写bootloader——mini2440(八、链接脚本与Makefile)

1、链接脚本

SECTIONS {
    . = 0x33f80000;
    .text : { *(.text) }
    
    . = ALIGN(4);
    .rodata : {*(.rodata*)} 
    
    . = ALIGN(4);
    .data : { *(.data) }
    
    . = ALIGN(4);
    __bss_start = .;
    .bss : { *(.bss)  *(COMMON) }
    __bss_end = .;
}

2、Makefile

CC      = arm-linux-gcc
LD      = arm-linux-ld
AR      = arm-linux-ar
OBJCOPY = arm-linux-objcopy
OBJDUMP = arm-linux-objdump

CFLAGS         := -Wall -O2
CPPFLAGS       := -nostdinc -nostdlib -fno-builtin

objs := start.o init.o boot.o

boot.bin: $(objs)
    ${LD} -Tboot.lds -o boot.elf $^
    ${OBJCOPY} -O binary -S boot.elf $@
    ${OBJDUMP} -D -m arm boot.elf > boot.dis
    
%.o:%.c
    ${CC} $(CPPFLAGS) $(CFLAGS) -c -o $@ $<

%.o:%.S
    ${CC} $(CPPFLAGS) $(CFLAGS) -c -o $@ $<

clean:
    rm -f *.o *.bin *.elf *.dis