Cross Compile Kernel Modules

Jun 2 2017

Table of Contents

1. Description
2. Solution

1 Description

When we need to write a kernel module for a board, we need the cross compile skill.

2 Solution

The key to cross compile is the Makefile. Sample as below:

MODULES := hello.o
obj-m := $(MODULES)

ARCH=arm
COMPILER=arm-openwrt-linux-
KDIR := /home/xyz/linux-3.14.43/
PWD := $(shell pwd)

MAKEARCH := $(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(COMPILER)

all: modules
modules:
    $(MAKEARCH) -C $(KDIR) M=$(PWD) modules

clean:
    $(MAKEARCH) -C $(KDIR) M=$(PWD) clean