openwrt 打PATCH方法

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http://wiki.openwrt.org/doc/devel/patches

全来官网

package目录打法
Adding a new patch
1>make package/example/{clean,prepare} V=s QUILT=1
make package/procd/{clean,prepare} V=s QUILT=1

2> cd build_dir/target-*/example-*
quilt new 010-main_code_fix.patch

3>quilt edit src/main.c
src/main.c gets added to 010-main_code_fix.patch

4>quilt refresh
Change back to the toplevel directory of the buildroot.
cd ../../../
To move the new patch file over to the buildroot, run update on the package:

5>make package/example/update V=s
make package/procd/update V=s
Finally rebuild the package to test the changes:

6>make package/example/{clean,compile} package/index V=s
make package/procd/{clean,compile} package/index V=s

tools目录打法
make tools/mkimage/{clean,prepare} V=s QUILT=1
cd build_dir/host/u-boot-2013.07-rc1/
quilt series
quilt new 080-image_h_fangshuaji.patch
quilt edit include/image.h
quilt refresh
cd ../../../
make tools/mkimage/update V=s
ls tools/mkimage/patches/
cat tools/mkimage/patches/080-image_h_fangshuaji.patch
make tools/mkimage/{clean,compile,install} V=s

内核的打法：
操作步骤：
1、进入Openwrt目录， make target/linux/{clean,prepare} V=s QUILT=1，这一步将linux内核清理干净，准备修改
2、进入解压出来的linux内核目录，cd build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7621/linux-2.6.36/
3、可以用quilt series来查看对当前内核有什么patch，
4、使用quilt new platform/0928-sky-mtd.patch，准备开始新patch
5. quilt edit drivers/mtd/mtdpart.c
5、进入drivers/mtd目录，编辑mtdpart.c，函数split_rootfs完成flash分区切分
ROOTFS_SPLIT_NAME就是rootfs_data，你模仿这个方式，划分好分区name，size和offset，然后调用add_one_partition添加分区。
6、将代码修改好后，运行 quilt refresh
7、回到最顶层目录，执行 make target/linux/update，这时候会生成patch，你可以在target/linux/ramips/patches-2.6.36目录下看到0928-sky-mtd.patch这个patch
8、客户还要在升级的时候写入一个分区，还要做一个标记，这个你可以直接修改package/base-files/files/sbin/sysupgrade脚本，这个不是用patch形式来修改的
9、执行make V=s编译生成image。

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