1) 訪問codesourcery官方網站下載最新的ARM交叉編譯工具鏈,當前最新版本是arm-2009q3:
http://www.codesourcery.com/sgpp/lite/arm/portal/package5383/public/arm-none-linux-gnueabi/arm-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
解壓縮至/arm-2009q3:
# tar jxvf arm-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2 -C /
# ls -1 /arm-2009q3/bin/
arm-none-linux-gnueabi-addr2line
arm-none-linux-gnueabi-ar
arm-none-linux-gnueabi-as
arm-none-linux-gnueabi-c++
arm-none-linux-gnueabi-c++filt
arm-none-linux-gnueabi-cpp
arm-none-linux-gnueabi-g++
arm-none-linux-gnueabi-gcc
arm-none-linux-gnueabi-gcc-4.4.1
arm-none-linux-gnueabi-gcov
arm-none-linux-gnueabi-gdb
arm-none-linux-gnueabi-gdbtui
arm-none-linux-gnueabi-gprof
arm-none-linux-gnueabi-ld
arm-none-linux-gnueabi-nm
arm-none-linux-gnueabi-objcopy
arm-none-linux-gnueabi-objdump
arm-none-linux-gnueabi-ranlib
arm-none-linux-gnueabi-readelf
arm-none-linux-gnueabi-size
arm-none-linux-gnueabi-sprite
arm-none-linux-gnueabi-strings
arm-none-linux-gnueabi-strip
# export PATH=/arm-2009q3/bin:$PATH
1) 下載最新的內核源代碼
可以到kernel.org下載已經打包的內核源碼文件,我這裏是通過git下載的:
# git clone http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
針對ARM交叉編譯,需要修改兩個變量:
ARCH ?= arm
CROSS_COMPILE ?= arm-none-linux-gnueabi-
# ls -1 /linux-2.6/arch/arm/
Kconfig
Kconfig-nommu
Makefile
boot/
common/
configs/
include/
kernel/
lib/
......
mach-s3c6410/
mach-s5pc100/
mach-s5pv210/
......
mm/
plat-s3c64xx/
plat-s5pc1xx/
......
這裏麪包含了流行的ARM芯片支持,其中的“mach-s5pc100”就是我們需要編譯的目標平臺。
# ls -1 /linux-2.6/arch/arm/configs/
......
s3c2410_defconfig
s3c6400_defconfig
s5pc100_defconfig
s5pc110_defconfig
s5pv210_defconfig
......
1) 準備.config文件
# cp -f /linux-2.6/arch/arm/configs/s5pc110_defconfig /linux-2.6/.config
# cd /linux-2.6/
# make menuconfig
# make
......
LD arch/arm/boot/compressed/vmlinux
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready #zImage就是壓縮過的內核。
vmlinux: ELF 32-bit LSB executable, ARM, version 1 (SYSV), statically linked, not stripped
# cp vmlinux ${TESTROOTFS}/boot/vmlinux-2.6.33
# cp System.map ${TESTROOTFS}/boot/System.map-2.6.33
# cp .config ${TESTROOTFS}/boot/config-2.6.33
# make INSTALL_MOD_PATH=${TESTROOTFS} modules_install
demo.c:
#include <linux/kernel.h>
#include <linux/module.h>
static int demo_init(void){
printk("demo init\n");
return 0;
}
static void demo_exit(void){
printk("demo exit\n");
}
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE("Dual BSD/GPL");
.PHONY: clean
obj-m := mod_template.o
#KDIR := /lib/modules/$(shell uname -r)/build
KDIR := /linux-2.6
PWD := $(shell pwd)
default:
$(MAKE) -C $(KDIR) M=$(PWD) modules
clean:
rm -rf *.ko *.o *.mod.* .H* .tm* .*cmd Module.symvers