linux 2.6.26内核在GEC2410上的移植

时间：2009-07-28 来源：yuanfu

一、移植前说明     交叉编译器版本为arm-linux-gcc 3.4.5，目标板为GEC2410，NAND FLASH 64M，SDRAM为64M。在网站 http://www.kernel.org/pub/linux/kernel/v2.6/ 可以下到最新的linux版本，解压之。二、移植步骤    1、修改内核根目录下的Makefile文件     $pwd     /home/yuaf/linux-2.6.26     $vi Makefile     找到     export KBUILD_BUILDHOST := $(SUBARCH)
    ARCH  ?= $(SUBARCH)
    CROSS_COMPILE ?=     将它修改为     ARCH ?= arm     CROSS_COMPILE ?= arm-linux-     注：我的编译器路径解压在 /usr/local/arm/ 目录下，修改环境变量/etc/environment,把自己的bin文件路径添加在此文件里，就行啦！就可以在任何一个地方直接使用arm-linux-gcc来进行编译啦！如：     $pwd     /etc     $more environment     PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/arm/gcc-3.4.5-glibc-2.3.6/bin" LANGUAGE="zh_CN:zh:en_US:en"
LANG="zh_CN.UTF-8"
   2.修改arch/arm/plat-s3c24xx/common-smdk.c文件，修改NAND FLASH的分区信息    $vi common-smdk.c    在smdk_default_nand_part[]中进行如下修改：

static struct mtd_partition smdk_default_nand_part[] = {
#if 0
    [0] = {
        .name    = "Boot Agent",
        .size    = SZ_16K,
        .offset    = 0,
    },
    [1] = {
        .name    = "S3C2410 flash partition 1",
        .offset = 0,
        .size    = SZ_2M,
    },
    [2] = {
        .name    = "S3C2410 flash partition 2",
        .offset = SZ_4M,
        .size    = SZ_4M,
    },
    [3] = {
        .name    = "S3C2410 flash partition 3",
        .offset    = SZ_8M,
        .size    = SZ_2M,
    },
    [4] = {
        .name    = "S3C2410 flash partition 4",
        .offset = SZ_1M * 10,
        .size    = SZ_4M,
    },
    [5] = {
        .name    = "S3C2410 flash partition 5",
        .offset    = SZ_1M * 14,
        .size    = SZ_1M * 10,
    },
    [6] = {
        .name    = "S3C2410 flash partition 6",
        .offset    = SZ_1M * 24,
        .size    = SZ_1M * 24,
    },
    [7] = {
        .name    = "S3C2410 flash partition 7",
        .offset = SZ_1M * 48,
        .size    = SZ_16M,
    }
   #else
    [0] = {
        .name    = "U-boot",
        .size    = SZ_1M,
        .offset    = 0,
    },
    [1] = {
        .name    = "Linux Kernel",
        .offset = SZ_1M,
        .size    = SZ_1M * 3,
    },
    [2] = {
        .name    = "root",
        .offset = SZ_4M,
        .size    = SZ_4M * 10,
    },
    [3] = {
        .name    = "user",
        .offset    = SZ_4M * 11,
        .size    = SZ_4M *5,
    },
   #endif
};

3、配置内核

在配置内核前，可以拷贝s3c2410默认的配置文件到内核源代码根目录下，以简化配置过程。

$cp arch/arm/configs/s3c2410_defconfig .config

$make menuconfig

再在此基础上配置一些选项,其具体的每项代表什么意思，可以参照如下网址，有比较详细的介绍。

http://lamp.linux.gov.cn/Linux/kernel_options.html

General setup --->

[*] Configure standard kernel features(for small systems)

System Type ---->

S3C2410 Machines --->

[*] SMKD2410/A9M2410

其余在此目录的全部按“N”。

而S3C2400 Machines、S3C2412 Machines、S3C2440 Machines、S3C2442 Machines、S3C2443 Machines全部选择 “N”。

Boot options --->

将 (root=/dev/hda1 ro init=/bin/bash console=ttySAC0) Default kernel command string
改成 (console=ttySAC0 root=/dev/nfs init=/linuxrc nfsroot=192.168.0.50:/home/yuaf/root_nfs ip=192.168.0.100:192.168.0.50:192.168.0.1:255.255.255.0:www.yuaf.com:eth0:off) Default kernel command string

也就是网络启动nfs文件系统的命令。init=/linuxrc,很重要！！！

Networking --->

Networking options --->

<*> Packet socket

[*] Packet socket:mapped IO

File systems --->

[*] Network File Systems --->

<*> NFS file system support

[*] Provide NFSv3 client support

[*] provide client support for the NFSv3 ACL protocol extension

[*] provide NfSv4 client support

<*> NFS server support