How to cross compile kernel driver on iMX6S ?

[toanjunifer]

Hi,

I'm using iMX6S-EVK with kernel version 4.9.88. I'm writing some simple kernel driver. I also download kernel linux 4.9.88. But when I compile, I got this error: 

ERROR: Kernel configuration is invalid.
include/generated/autoconf.h or include/config/auto.conf are missing.
Run 'make oldconfig && make prepare' on kernel src to fix it.
WARNING: Symbol version dump ./Module.symvers
is missing; modules will have no dependencies and modversions.

CC [M] /home/user1/Desktop/exploringBB/extras/kernel/gpio_test/gpio_test.o
In file included from <command-line>:0:0:
././include/linux/kconfig.h:4:32: fatal error: generated/autoconf.h: No such file or directory
compilation terminated.

This is my Makefile: 

KERNEL ?= /home/user1/Desktop/linux
ARCH ?= arm
CROSS_COMPILE ?= arm-linux-gnueabihf-
obj-m+=hello.o

all:
make ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNEL) M=$(PWD) modules
clean:
make ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNEL) M=$(PWD) clean

I execute this command to build: 

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-

Did I missing something ? What should I do now ?

Thank you so much,

Toan

[shivanipatel · Accepted solution]

Hi toanjunifer@gmail.com‌,

You need to give a compiled kernel path in the "KERNEL" variable in your Makefile.

Do you have the yocto setup for i.MX6S EVK? If so then you need to give this path in your {yocto_build_dir}/tmp/work/imx6slevk-poky-linux-gnueabi/linux-imx/4.9.88-r0/build to KERNEL variable in Makefile. Then after try to compile your module.

Let us know in case of any concerns.

Hope this will help you.

Regards,

Shivani

[toanjunifer]

Hi shivanipatel‌,

Sorry for late response. I also done it like your guide.

Thank you so much.

Have a nice day !