makefilecross-compilingembedded-linuxkernel-modulelinux-toolchain

Cross compiling a kernel module

I'm trying to cross compile a helloworld kernel (2.6.x) module for ARM architecture on my intel x86 host.

The codesourcery tool chain for ARM is located at: /home/ravi/workspace/hawk/arm-2009q3

The kernel source is located at :/home/ravi/workspace/hawk/linux-omapl1

My Makefile:

ARCH=arm
CROSS_COMPILE=arm-none-linux-gnueabi
obj-m := Hello.o
KDIR := /home/ravi/workspace/hawk/linux-omapl1
PWD := $(shell pwd)
default:
          $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
clean:
          $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean

When i run make, the .ko produced is that of my host machine which means the makefile is invoking the native compiler instead of the cross compiler.What am I doing wrong? The cross compiler's binaries are in my path.

Solution

  • Putting ARCH and CROSS_COMPILE in the Makefile doesn't work. You need to put them on the command line:

    make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-