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1.移植环境：

CPU：S3C2410

Flash：Intel E28F128

2.修改设备号

由于ROM设备和MTDBlock设备的主设备号（major）都是31，所以如果你不想把JFFS2作为根文件系统的话，必须修改他们之一的major。如果你要修改JFFS2的设备major，在uClinux-dist/linux-2.4.x/include/linux/mtd/mtd.h中把

＃define MTD_BLOCK_MAJOR 31

改成

＃define MTD_BLOCK_MAJOR 30

3.编写Maps文件

添加在flash上的map文件。在HHARM2410-R3/kernel/drivers/mtd/maps下添加自己mcu的map，我把握的文件内容贴上，仅供参考：

S3c2410_llg.c

/*

* Normal mappings of chips on Samsung s3c2410 in physical memory

*/

#include <linux/module.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <asm/io.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/map.h>

#include <linux/mtd/partitions.h>

#include <linux/config.h>

#define WINDOW_ADDR 0x01000000 //基地址

#define WINDOW_SIZE 0x01600000 //flash大小 16M

#define BUSWIDTH 2

static struct mtd_info *mymtd;

__u8 s3c2410_read8(struct map_info *map, unsigned long ofs)

{

return readb(map->map_priv_1 + ofs);

}

__u16 s3c2410_read16(struct map_info *map, unsigned long ofs)

{

return readw(map->map_priv_1 + ofs);

}

__u32 s3c2410_read32(struct map_info *map, unsigned long ofs)

{

return readl(map->map_priv_1 + ofs);

}

void s3c2410_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)

{

memcpy(to, (void *)(map->map_priv_1 + from), len);

}

void s3c2410_write8(struct map_info *map, __u8 d, unsigned long adr)

{

writeb(d, map->map_priv_1 + adr);

}

void s3c2410_write16(struct map_info *map, __u16 d, unsigned long adr)

{

writew(d, map->map_priv_1 + adr);

}

void s3c2410_write32(struct map_info *map, __u32 d, unsigned long adr)

{

writel(d, map->map_priv_1 + adr);

}

void s3c2410_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)

{

memcpy((void *)(map->map_priv_1 + to), from, len);

}

struct map_info s3c2410_map = {

name: "s3c2410 flash device",

size: WINDOW_SIZE,

buswidth: BUSWIDTH,

read8: s3c2410_read8,

read16: s3c2410_read16,

read32: s3c2410_read32,

copy_from: s3c2410_copy_from,

write8: s3c2410_write8,

write16: s3c2410_write16,

write32: s3c2410_write32,

copy_to: s3c2410_copy_to,

map_priv_1: WINDOW_ADDR,

map_priv_2: -1,

};

//以下是分区的内容，当然要根据你自己的需要确定了

static struct mtd_partition s3c2410_partitions[] = {

{

name: "reserved for bootloader",

size: 0x040000,

offset: 0x0,

mask_flags: MTD_WRITEABLE,

},

{

name: "reserved for kernel",

size: 0x0100000,

offset: 0x040000,

mask_flags: MTD_WRITEABLE,

},

{

name: "reserved for ramdisk",

size: 0x400000,

offset: 0x140000,

mask_flags: MTD_WRITEABLE,

},

{

name: "jffs2(8M)",

size: 0x800000,

offset: 0x800000,

}

};

int __init init_s3c2410(void)

{

printk(KERN_NOTICE "s3c2410 flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);

s3c2410_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);

//printk("0\n");

if (!s3c2410_map.map_priv_1) {

printk("Failed to ioremap/n");

return -EIO;

}

//printk("1\n");

mymtd = do_map_probe("jedec_probe", &s3c2410_map);

if (!mymtd)

mymtd = do_map_probe("cfi_probe", &s3c2410_map);

//printk("2\n");

if (mymtd) {

mymtd->module = THIS_MODULE;

mymtd->erasesize = 0x20000; //擦除的大小 INTEL E28F128J3A-150 是128kb

return add_mtd_partitions(mymtd, s3c2410_partitions, sizeof(s3c2410_partitions) / sizeof(struct mtd_partition));

}

//printk("3\n");

iounmap((void *)s3c2410_map.map_priv_1);

return -ENXIO;

}

static void __exit cleanup_s3c2410(void)

{

if (mymtd) {

del_mtd_partitions(mymtd);

map_destroy(mymtd);

}

if (s3c2410_map.map_priv_1) {

iounmap((void *)s3c2410_map.map_priv_1);

s3c2410_map.map_priv_1 = 0;

}

}

module_init(init_s3c2410);

module_exit(cleanup_s3c2410);

至于其文件内容及语句的含义不想多说了，网上相关的文章也有不少，参考一下吧。

4.将配置选项加入HHARM2410-R3/kernel/drivers/mtd/maps/Config.in

if [ "$CONFIG_ARM" = "y" ]; then

dep_tristate ' CFI Flash device mapped on ARM Integrator/P720T' CONFIG_MTD_ARM_INTEGRATOR $CONFIG_MTD_CFI $CONFIG_ARCH_INTEGRATOR

dep_tristate ' Cirrus CDB89712 evaluation board mappings' CONFIG_MTD_CDB89712 $CONFIG_MTD_CFI $CONFIG_ARCH_CDB89712

dep_tristate ' CFI Flash device mapped on StrongARM SA11x0' CONFIG_MTD_SA1100 $CONFIG_MTD_CFI $CONFIG_ARCH_SA1100 $CONFIG_MTD_PARTITIONS

dep_tristate ' CFI Flash device mapped on DC21285 Footbridge' CONFIG_MTD_DC21285 $CONFIG_MTD_CFI $CONFIG_ARCH_FOOTBRIDGE $CONFIG_MTD_PARTITIONS

dep_tristate ' CFI Flash device mapped on Lubbock board' CONFIG_MTD_LUBBOCK $CONFIG_MTD_CFI $CONFIG_ARCH_LUBBOCK $CONFIG_MTD_PARTITIONS

dep_tristate ' CFI Flash device mapped on the FortuNet board' CONFIG_MTD_FORTUNET $CONFIG_MTD_CFI $CONFIG_ARCH_FORTUNET $CONFIG_MTD_PARTITIONS

dep_tristate ' CFI Flash device mapped on Epxa10db' CONFIG_MTD_EPXA10DB $CONFIG_MTD_CFI $CONFIG_MTD_PARTITIONS $CONFIG_ARCH_CAMELOT

dep_tristate ' CFI Flash device mapped on PXA CerfBoard' CONFIG_MTD_PXA_CERF $CONFIG_MTD_CFI $CONFIG_ARCH_PXA_CERF $CONFIG_MTD_PARTITIONS

dep_tristate ' NV-RAM mapping AUTCPU12 board' CONFIG_MTD_AUTCPU12 $CONFIG_ARCH_AUTCPU12

#llg add S3C2410 的CFI配置

dep_tristate ' CFI Flash device mapped on S3C2410' CONFIG_MTD_S3C2410 $CONFIG_MTD_CFI

fi

5. 编译内核、下载

1）make menuconfig将4加入的内容选中

2）在make menuconfig下配置选项。（抄的。可能不太一样，只要你配置对了就可以了）

在linux Kernel v2.4.20-uc0 Configuration下

Memory Technology Devices(MTD)下

CONFIG_MTD=Y

CONFIG_MTD_DEBUG=Y

CONFIG_MTD_DEBUG_VERBOSE=3

CONFIG_MTD_PARTITIONS=Y

CONFIG_MTD_CHAR=Y

CONFIG_MTD_BLOCK=Y

RAM/ROM/Flash chip drivers下

CONFIG_MTD_CFI=Y

CONFIG_MTD_JEDECPROBE=Y

CONFIG_MTD_CFI_AMDSTD=Y

Mapping drivers for chip access下

CONFIG_S3C2410=Y

File systems下

CONFIG_JFFS2_FS=Y

CONFIG_JFFS2_FS_DEBUG=2

在uClinux v1.3.4 Configuration下

Flash Tools下

CONFIG_USER_MTDUTILS=Y

CONFIG_USER_MTDUTILS_ERASE=Y

CONFIG_USER_MTDUTILS_ERASEALL=Y

CONFIG_USER_MTDUTILS_MKFSJFFS2=Y

3）make zImage 重新编译内核

4)下载到内存或flash

6.检查jffs2是否配置成功

根据上述的修改，启动armlinux，看一下/proc/mtd的文件内容（当然你的系统要支持proc文件系统）

# cat /proc/mtd

dev: size erasesize name

mtd0: 01000000 00020000 "Physically mapped flash"

mtd1: 00040000 00020000 "reserved for bootloader"

mtd2: 00100000 00020000 "reserved for kernel"

mtd3: 00400000 00020000 "reserved for ramdisk"

mtd4: 00800000 00020000 "jffs2"

如果出现上述内容，则说明你的jffs2系统已经配置成功了

7.使用Jffs2文件系统

1)# /erase /dev/mtd/4

MTD_open

MTD_ioctl

Erasing 128 KibMte @ 0 -- 0 % complete.TD_ioctl

Erasing 128 KibMte @ 20000 -- 1 % complete.TD_ioctl

Erasing 128 KibMte @ 40000 -- 3 % complete.TD_ioctl

……

Erasing 128 KibMte @ 7e0000 -- 98 % complete.TD_ioctl

Erased 8192 Kibyte @ 0 -- 100% Complete.

MTD_close

这一步应该可以用直接烧些flash的方法代替：

[root@llg]#mkfs.jffs2 -d /bin -o jffs2.img （/bin随便的目录）

然后将jffs2.img烧入1800000（根据自己的情况确定地址）

至于上面的删除操作，我也没搞太明白，因为我第一次做的时候直接烧写flash就成功了，但刚刚执行却执行了erase之后才成功了

2）#mkfs.jffs2 -d /bin -o jffs2.img

mkfs.jffs2 网上应该可以找到

3）#cp jffs2.img /dev/mtd1

4）#mount -t jffs2 /dev/mtdblock1 /mnt

mtdblock_open

ok

5）#cd /mnt

6）#ls（如果正确就说明你成功了）

好了，粗粗的写了这些，应该是可以使的，因为所附上的所有代码都是我现在使的，没有任何保留啊！！！我希望大家也经常写些东东，让别人与你一起分享成功的喜悦！（当然是可以共享的东东了！）