给LEDE/OpenWRT打补丁

参考资料
https://wiki.openwrt.org/doc/devel/patches
https://lede-project.org/docs/guide-developer/use-patches-with-buildsystem

先安装quilt

# apt-get install quilt

配置

cat > ~/.quiltrc <<EOF
QUILT_DIFF_ARGS="--no-timestamps --no-index -p ab --color=auto"
QUILT_REFRESH_ARGS="--no-timestamps --no-index -p ab"
QUILT_SERIES_ARGS="--color=auto"
QUILT_PATCH_OPTS="--unified"
QUILT_DIFF_OPTS="-p"
EDITOR="nano"
EOF

如果要编译内核 make -C target/linux compile
在 target/linux/ramips/patches-4.4/ 目录下已经有好多补丁

好了，准备开始
1）清除旧的编译

make target/linux/clean

2) 准备全新的源代码

 make target/linux/prepare QUILT=1
或者
 make target/linux/prepare V=s QUILT=1

3）应用所有已经存在的补丁

切换到kernel目录
cd build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7688/linux-3.18.44
应用补丁
quilt push -a

4)查看最大的patch编号

quilt series
或者
quilt top

5)添加我们自己的补丁

quilt new generic/999-EC20R2_qmi_driver.patch

6)修改源文件

quilt edit drivers/usb/serial/option.c
quilt edit drivers/usb/serial/usb_wwan.c
quilt edit drivers/net/usb/qmi_wwan.c

7）确认diff是否完整

quilt diff

8)将diff写入到文件

quilt refresh

9.回到build根目录

make target/linux/update package/index V=s

会将我们的补丁，放到合适的目录
也可以手动做这个操作
将
build_dir/target-mipsel_24kc_musl/linux-ramips_mt7688/linux-4.4.49/patches/generic/999-EC20R2_qmi_driver.patch
放到
target/linux/generic/patches-4.4/999-EC20R2_qmi_driver.patch