CROSS_COMPILE a driver

[houtpeng]

I have install the QorIQ-SDK-V1.9-20151210-yocto at /home/Yocto/QorIQ_SDK_V1.9/Project/QorIQ-SDK-V1.9-20151210-yocto. In addition to making bitbake fsl-image-minimal/fsl-image-mfgtoo/fs-toolchain  success,  I have installed the standalone toolchain at /opt/fsl-qoriq/1.9/. I write a helloworld driver program :

#include <linux/module.h>

#include <linux/init.h>

MODULE_LICENSE("GPL");

static int __init hello_init(void)

{

    printk("\r\n\r\n 1 Hello world, begin");

    return 0;

}

static void __exit hello_exit(void)

{

    printk("\r\n 1 Hello world, exit\r\n");

    return;

}

module_init(hello_init);

module_exit(hello_exit);

the Makefile:

ifneq ($(KERNELRELEASE),)

    obj-m := hello.o

else

    KERNELDIR := /lib/modules/$(shell uname -r)/build

    PWD := $(shell pwd)

all:

    make -C $(KERNELDIR) M=$(PWD) modules

clean:

    rm -rvf *.o *.mod.c *.mod.o

endif

the question is where the location should i give to KERNELDIR, and make the hello,ko can runing success at the demo board

thanks

[Pavel · Accepted solution]

It looks like that you want to compile kernel module.

See the following pages for this task.

http://docs.oracle.com/cd/E19253-01/817-5789/emjjr/index.html

http://www.yoctoproject.org/docs/1.6.1/kernel-dev/kernel-dev.html

https://software.intel.com/sites/default/files/m/4/d/8/5/8/42868-11__Developing_Kernel_Module_on_Yoc...

Have a great day,
Pavel Chubakov

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[Pavel]

Use the similar command sequence for toolchain installed and standalone file compiling using SDK 1.9.

1. 1. Build and install the standalone toolchain with Yocto:

$ source ./fsl-setup-poky -m <machine>

$ bitbake fsl-toolchain

$ cd build_<machine>_release/tmp/deploy/sdk

$ ./fsl-networking-eglibc-<host-system>-<core>-toolchain-<release>.sh

Note: The default installation path for standalone toolchain is /opt/fsl-networking/. The install folder can be specified during the installation procedure.

1. 2. Standalone file compiling test.c file.

QorIQ P2020

source /opt/fsl-qoriq/1.9/environment-setup-ppce500v2-fsl-linux-gnuspe

gcc test.c --sysroot=/opt/fsl-qoriq/1.9/sysroots/ppce500v2-fsl-linux-gnuspe -o test.c

Have a great day,
Pavel Chubakov

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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[houtpeng]

Thanks Pavel for your answer,

you cross_compile the user program[test.c] with the standalone toolchain, but i want to cross_compile a driver program[hello.c] with the standalone toolchain, can you help me?