JZ2440 driver compilation, installation and testing

1. Compile the Linux kernel

Documents needed:

a. Kernel file (e.g. linux-2.6.22.6.tar.bz2)

b. Corresponding patch file (for example, linux-2.6.22.6_jz2440.patch)

$ tar xjf linux-2.6.22.6.tar.bz2//Unzip the kernel file

$ cd linux-2.6.22.6

$ patch -p1 < ../linux-2.6.22.6_jz2440.patch //Apply patch

$ mv ../4.3-inch LCD_mach-smdk2440.c arch/arm/mach-s3c2440/mach-smdk2440.c // Replace 4.3-inch source code

$ cp config_ok .config

$ make uImage

After completion, remember the location of the kernel file

Here is /home/stu/JZ2440_QQ_WuLian/linux-3.4.2

After successful compilation, the uImage file is generated in the arch/arm/boot directory of the kernel.

Note: To successfully "make uImage", you must copy the mkimage tool obtained when compiling u-boot to /usr/bin

The mkimage tool is in the tools directory under the u-boot source code.

2. Compile the driver

Documents needed:

a. Driver source file (such as first_drv.c)

b. Makefile

First modify the Makefile

KERN_DIR = /work/system/linux-3.4.22

all:

    make -C $(KERN_DIR) M=`pwd` modules 

clean:

    make -C $(KERN_DIR) M=`pwd` modules clean

    rm -rf modules.order

obj-m += first_drv.o

Change the first line path KERN_DIR = /work/system/linux-3.4.22 to the location where your kernel file is placed

Then make

It can be found that first_drv.ko is generated

pay attention:

The prerequisite for compiling the driver module is that the kernel has been successfully compiled.

3. Compile test files

Documents needed:

a. Test source file (such as firstdrvtest.c)

Compile

arm-linux-gcc firstdrvtest.c -o firstdrvtest

You can find that the executable file firstdrvtest is generated

4. Test on the development board

A. Put the driver file first_drv.ko and the test file firstdrvtest generated earlier into the nfs mount directory

2440 Mounting a Linux folder via NFS Reference 2440 Mounting a Linux folder via NFS

cp first_drv.ko /home/stu/nfs

cp firstdrvtest /home/stu/nfs

B. Load (register) driver module

a.//Create an empty directory

mkdir -p /lib/modules/3.4.2

You must create an empty directory like /lib/modules/2.6.30.4, otherwise the ko module cannot be uninstalled

b. Mobile drive module

cp first_drv.ko /lib/modules/3.4.2/

#cd /lib/modules/3.4.2/

#insmod first_drv.ko //load

#lsmod//View

first_drv 1329 0 - Live 0xbf010000 (O)

buttons 2693 0 - Live 0xbf008000 (O)

If you want to uninstall, use rmmod

#rmmod first_drv

#lsmod

buttons 2693 0 - Live 0xbf008000 (O)

C. Execute the test

./firstdrvtest on

You can see the light on

./firstdrvtest off

You can see the lights go out