一、安装交叉编译环境
交叉编译环境跟uboot使用的一样。
参考：arm-linux-gnueabihf 交叉编译工具链安装
二、下载编译linux源码
(默认是zero-4.10.y分支)：
git clone https://github.com/Lichee-Pi/linux.git
或者`zero-4.13.y`对网卡的支持更好
git clone -b zero-4.13.y https://github.com/Lichee-Pi/linux.git
cd linux
make ARCH=arm licheepi_zero_defconfig
make ARCH=arm menuconfig #add bluethooth, etc.
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16 INSTALL_MOD_PATH=out modules
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16 INSTALL_MOD_PATH=out modules_install
三、修改顶层Makefile编译
在内核根目录下的Makefile257行修改默认编译器，可以直接用make编译：
# ARCH ?= $(SUBARCH)
# CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
ARCH ?= arm
CROSS_COMPILE ?= arm-linux-gnueabihf-
编译命令：
make licheepi_zero_defconfig
make menuconfig #add bluethooth, etc.
make -j16
make -j16 INSTALL_MOD_PATH=out modules
make -j16 INSTALL_MOD_PATH=out modules_install
编译LOG：
pjw@pjw-virtual-machine:~/Allwinner/V3S/linux$ make -j16 INSTALL_MOD_PATH=out modules
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
CHK scripts/mod/devicetable-offsets.h
CHK include/generated/timeconst.h
CHK include/generated/bounds.h
CHK include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
Building modules, stage 2.
MODPOST 3 modules
pjw@pjw-virtual-machine:~/Allwinner/V3S/linux$ make -j16 INSTALL_MOD_PATH=out modules_install
INSTALL crypto/echainiv.ko
INSTALL drivers/staging/rtl8723bs/r8723bs.ko
INSTALL drivers/video/backlight/lcd.ko
DEPMOD 4.13.16-licheepi-zero+
pjw@pjw-virtual-machine:~/Allwinner/V3S/linux$
编译完成后，zImage在arch/arm/boot/下，驱动模块在out/下，sun8i-v3s-licheepi-zero-dock.dtb在arch/arm/boot/dts/下