Repartition J2440

The factory-preinstalled JZ2440 development board has already burned the bootloader, kernel and file system. However, during specific use, we found that the kernel partition divided on the board was only 2M, and the kernel we compiled was larger than 2M, so the kernel was programmed to nandflash and started unsuccessfully. How to do it? I looked up the information and found a solution.

2 methods, choose one: 1. Modify the file uboot-1.1.6/include/configs/100ask2440.h. If it is a non-jz2440 development board, this file cannot be found. However, the approximate path is correct. You can search using the following command first:

find ./ -name "*" | xargs grep "2m(kernel)"

That is to say, by searching for files containing 2m (kernel) in the current directory and its subdirectories, the file to be modified can be quickly located. Find the file and open it with VI. In the command line mode, enter:

/MTDPARTS_DEFAULT

. Find:

#define MTDPARTS_DEFAULT
"mtdparts=nandflash0:256k@0(bootloader),"

"128k(params),"

"2m(kernel),"

"-(root)"

Changing the kernel size above to 4m is almost enough. Recompile u-boot after modification.

2. Modify common-smdk.c in the kernel. Different versions of the kernel may have different locations. It is best to search before finding:

locate common-smdk.c

or

find ./ -name common-smdk.c

My kernel version  is Linux -3.4.2, this file is in arch/arm/mach-s3c24xx/common-smdk.c. After opening the file, find the following content. The bold part is the partition size of nandflash. You can modify

the static struct mtd_partition smdk_default_nand_part[] = {

[0] = {

.name = “bootloader”,

.size = SZ_256K,

.offset = 0,

},

[1] = {

.name = “params”,

.offset = MTDPART_OFS_APPEND,

.size = SZ_128K,

},

[2] = {

.name = “kernel”,

.offset = MTDPART_OFS_APPEND,

.size = SZ_4M,

},

[3] = {

.name = “rootfs”,

.offset = MTDPART_OFS_APPEND,

.size = MTDPART_SIZ_FULL,

}

};

After modification, just recompile the kernel. When U-BOOT is started, you can use the mtd command to check whether the partition is effective. My partition table is as follows: