搭建JZ2440最小系统（三）修改内核大小，适配目标板Nand flash分区配置

一. 修改内核大小

1. 在你的配置文件下uboot/include/config/xxx.h 里面有一个宏定义

 

#define MTDPARTS_DEFAULT    "mtdparts=jz2440-0:256k(u-boot),"    \
                        "128k(params),"        \
                        "4m(kernel),"    \
                        "-(rootfs)"        \

 

    此处将kerner对应的字段修改后即可修改uboot为linux内核分配的空间， kernel内为flash分配的分区下面分析。

 

二. 修改Nand Flash分区

 

1. 修改arch/arm/mach-s3c24xx/common-smdk.c文件中如下内容

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,

    }
};

    arm/mach-s3c24xx/mach-mini2440.c中配套修改

static struct mtd_partition mini2440_default_nand_part[] __initdata = {
    [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,

    }
};

2. 修改系统晶振时钟

    在文件arch/arm/mach-s3c24xx/mach-smdk2440.c中将时钟改位12M

static void __init smdk2410_init_time(void)
{
    s3c2410_init_clocks(12000000);
    samsung_timer_init();
}

3. 修改完成后执行make uImage LOADADDR=0x30108000 -j8进行编译