Porting Linux-3.4.2 to TQ2440

Development Environment

Host development environment: Ubuntu 12.04

BootLoader: u-boot-2012.04.01

kernel:linux-3.4.2

CPU: s3c2440

Development board: TQ2440

step

I have previously ported the linux-2.6.30.4 kernel, and this time I will try to port a higher version of the kernel, Linux-3.4.2

1. Download kernel source code

Download address: Kernel download address

Copy to the virtual machine and decompress the kernel

tar -jxvf linux-3.4.2.tar.bz2

2. Add support for ARM in the system

3. Modify the platform input clock

If you don't modify it, garbled characters will appear when you start the kernel

The corresponding single board file found in the kernel source code is archarmmach-s3c24xxmach-smdk2440.c file. In the smdk2440_map_io function, it can be seen that there is a problem with the crystal oscillator setting. The TQ2440 board has a 12M crystal oscillator, so the modification is as follows:

4. Select the kernel configuration file and compile

Enter the default configuration file directory of the ARM architecture board:

cd arch/arm/configs/

Go back to the root directory, configure the kernel, compile and generate the UImage image

make s3c2410_defconfig

make uImage

5. Download to the development board for testing

tftp 30000000 uImage

bootm 30000000

Unable to mount root file system temporarily

6. Modify the kernel mtd partition table

Enter

arch/arm/mach-s3c24xx/common-smdk.c

The previous kernel partition table was

change into

7. Modify the kernel source code to support DM9000 network card driver

The SMDK2440 development board used in the previous configuration does not support the DM9000 network card driver by default, so the network card needs to be transplanted. According to Wei Dongshan's transplantation method, the file system cannot be mounted. I have tried it many times, so I won't post the pictures here. So I suspect that something is missing, and then I think about it carefully. My board is TQ2440. I can try the previous method of transplanting the 2.6.30.4 kernel and transplant the DM9000 network card according to Tianqian's method.

Enter the kernel source directory and find

arch/arm/mach-s3c24xx/mach-smdk2440.c

For specific methods, please refer to my blog on porting the linux-2.6.30.4 kernel: https://editor.csdn.net/md/?articleId=105127813

The method of modifying mach-smdk2440.c is basically the same as Wei Dongshan's, and then I modified it according to Tianqian's method

linux-3.4.2/drivers/net/ethernet/davicom/dm9000.c

8. Compile the kernel and test the NFS method to mount the file system

Because the kernel has supported the network card driver, try to mount the file system in NFS mode first.

make uImage

Copy the image to the TFTP folder and start the development board

Modify u-boot environment variables

setenv bootargs root=/dev/nfs rw nfsroot=192.168.1.192:/source/rootfs ip=192.168.1.6 init=linuxrc console=ttySAC0,115200 

An error occurred. The file was clearly mounted, but a kernel error occurred. After searching for information, refer to the blog: Reference article

It was found that the compiler used the eabi interface (Embedded Application Binary Interface) when compiling, but the configuration was not enabled in the kernel, so the kernel prompted that this was an illegal instruction.

7. Configure the kernel to support EABI interface

Enter the kernel directory

make menuconfig

make uImage

8. Multiple ways to mount the root file system

After the above kernel configuration, the root file system is successfully mounted

(1) The file system uses Wei Dongshan's

(2) The file system is made according to the Tianjian

(3) Configure the kernel to support the Yaffs file system. Please refer to my blog: Porting the Yaffs file system

The file system used is the yaffs2 file system made by Wei Dongshan. I will build the file system myself when I have time.

Postscript: After several nights of hard work, I encountered various problems and almost gave up. Finally, my hard work paid off and I successfully ported the linux-3.4.2 kernel to TQ2440!