linux内核版本 2.6.14,Linux-2.6.14内核在S3C2410上的移植

1.准备工作

下载解压交叉编译工具,2.6的内核编译要用3.4.1版本的(arm-linux-gcc-3.4.1).

下载解压2.6.14.1内核.

之前文章已经说明不再赘述.

2.Flash分区管理

启动开发板，进入vivi，查看vivi的分区信息.

分区信息如下所示：

分区

起始地址

分区大小

分区作用

Part0

0x0

0x00020000 (128k)

bootloader

Part1

0x00020000

0x00010000 (64k)

bootloader params

Part2

0x00030000

0x001c0000(1m+768k)

linux kernel

Part3

0x00200000

0x00400000 (4m)

root filesystem

Part4

0x00600000

0x03a00000 (58m)

usr filesystem

根据实际需要也可相应的更改分区表.

3.修改Makefile

#vi Makefile

找到ARCH与CROSS_COMPILE，修改为

ARCH ?= arm

CROSS_COMPILE ?= /usr/local/arm/3.4.1/bin/arm-linux- (交叉编译工具的路径)

4.将Flash分区信息加入内核

#vi arch/arm/mach-s3c2410/devs.c

添加头文件：

#include #include #include 添加分区结构：

static struct mtd_partition partition_info[]={

{name:"bootloader",

offset:0,

size: 0x00020000,},

{name:"param",

offset:0x00020000,

size:0x00010000,},

{name:"kernel",

offset:0x00030000,

size:0x001c0000,},

{name:"root",

offset:0x00200000,

size:0x00400000,},

{name:"usr",

offset:0x00600000,

size:0x03a00000,}

};

struct s3c2410_nand_set nandset={

nr_partitions: 5,                          //分区数量

partitions: partition_info,             //分区表

};

struct s3c2410_platform_nand superlpplatform={

//NAND Flash芯片支持

//参数意义可参考S3C2410手册

tacls: 0,

twrph0: 30,

twrph1: 0,

sets: &nandset,

nr_sets: 1,

};

修改s3c_device_nand，以加入NAND Flash驱动：

struct platform_device s3c_device_nand = {

.name = "s3c2410-nand",      //设备名称

.id = -1, //有效设备编号，-1表示唯一设备

.num_resources = ARRAY_SIZE(s3c_nand_resource),   //寄存器区的个数

.resource = s3c_nand_resource,     //寄存器区的首地址

//添加如下信息，表示NAND Flash设备

.dev={

.platform_data=&superlpplatform

}

};

5.指定启动时的设备初始化

#vi arch/arm/mach-s3c2410/mach-smdk2410.c

修改：

static struct platform_device *smdk2410_devices[] __initdata = {

&s3c_device_usb,

&s3c_device_lcd,

&s3c_device_wdt,

&s3c_device_i2c,

&s3c_device_iis,

//添加如下信息

&s3c_device_nand,

};6.禁止Flash ECC效验

内核通过vivi把数据写入NAND Flash，而vivi的ECC效验算法和内核的不同，内核的效验码是由NAND Flash控制器产生的，所以在此必须禁用NAND Flash ECC。

#vi drivers/mtd/nand/s3c2410.c

找到s3c2410_nand_init_chip函数，加入chip->eccmode的值为：

NAND_ECC_NONE

7.内核配置与编译

为了我们的内核支持devfs以及在启动时并在/sbin/init运行之前能自动挂载/dev为devfs文件系统，修改fs/Kconfig文件

#vi fs/Kconfig

找到menu "Pseudo filesystems"

添加如下语句：

config DEVFS_FS

bool "/dev file system support (OBSOLETE)"

default y

config DEVFS_MOUNT

bool "Automatically mount at boot"

default y

depends on DEVFS_FS

配置内核:

#cp arch/arm/configs/smdk2410_defconfig .config

#make menuconfig

在smdk2410_defconfig基础上，增删的内核配置项如下：

Loadable module support >

[*] Enable loadable module support

[*] Automatic kernel module loading

System Type >

[*] S3C2410 DMA support

Boot options >

Default kernel command string:

noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0,115200

#说明：mtdblock2代表我的第3个flash分区，它是我的rootfs

# console=ttySAC0,115200使kernel启动期间的信息全部输出到串口0上.

# 2.6内核对于串口的命名改为ttySAC0，但这不影响用户空间的串口编程。

# 用户空间的串口编程针对的仍是/dev/ttyS0等

Floating point emulation >

[*] NWFPE math emulation

This is necessary to run most binaries!!!

Device Drivers >

Memory Technology Devices (MTD) >

[*] MTD partitioning support

#支持MTD分区，这样我们在前面设置的分区才有意义

[*] Command line partition table parsing

#支持从命令行设置flash分区信息，灵活

RAM/ROM/Flash chip drivers >

Detect flash chips by Common Flash Interface (CFI) probe

Detect nonCFI AMD/JEDECcompatible flash chips

Support for Intel/Sharp flash chips

Support for AMD/Fujitsu flash chips

Support for ROM chips in bus mapping

NAND Flash Device Drivers >

NAND Device Support

NAND Flash support for S3C2410/S3C2440 SoC

Character devices >

[*] Nonstandard serial port support

[*] S3C2410 RTC Driver

File systems >

<> Second extended fs support #去除对ext2的支持

Pseudo filesystems >

[*] /proc file system support

[*] Virtual memory file system support (former shm fs)

[*] /dev file system support (OBSOLETE)

[*] Automatically mount at boot (NEW)

#这里会看到我们前先修改fs/Kconfig的成果，devfs已经被支持上了

Miscellaneous filesystems >

Compressed ROM file system support (cramfs)

#支持cramfs

Network File Systems >

NFS file system support

编译内核:

#make zImage

8.加载内核

vivi>load flash kernel t

修改vivi启动参数:

vivi>param set linux_cmd_line “noinitrd root=/dev/mtdblock/3 init=/linuxrc console=ttySAC0,115200”

vivi>param save

但是我自己的还没移植成功

mice: PS/2 mouse device common for all mice

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 4096 (order: 2, 16384 bytes)

TCP bind hash table entries: 4096 (order: 2, 16384 bytes)

TCP: Hash tables configured (established 4096 bind 4096)

TCP reno registered

TCP bic registered

NET: Registered protocol family 1

Reading data from NAND FLASH without ECC is not recommended

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)

每次到这就停，郁闷中.........