参照llg写的关于hharm（e28f128flash）上的jffs2的移植

具体如下：

1.移植环境：

CPU：ARMS3C2410

Linux version:2.4.18

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flash(e28f128j3a-150)的map，我把握的文件内容贴上，仅供参考：S3c2410_wpq.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 2static struct mtd_info *mymtd;__u8 s3c2410_read8(struct map_info *map, unsigned long ofs){ return readb(map- } __u16 s3c2410_read16(struct map_info *map, unsigned long ofs) { return readw(map- } __u32 s3c2410_read32(struct map_info *map, unsigned long ofs) { return readl(map- } void s3c2410_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) { memcpy(to, (void *)(map- } void s3c2410_write8(struct map_info *map, __u8 d, unsigned long adr) { writeb(d, map- } void s3c2410_write16(struct map_info *map, __u16 d, unsigned long adr) { writew(d, map- } void s3c2410_write32(struct map_info *map, __u32 d, unsigned long adr) { writel(d, map- } void s3c2410_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) { memcpy((void *)(map- } 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- mymtd- 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网上相关的文章也有不少，参考一下吧。

4.将配置加入HHARM2410-R3/kernel/drivers/mtd/maps/Config.in

if [ "$CONFIG_ARM" = "y" ]; thendep_tristate ' CFI Flash device mapped on ARM Integrator/P720T' CONFIG_MTD_ARM_INTEGRATOR $CONFIG_MTD_CFI $CONFIG_ARCH_INTEGRATORdep_tristate ' Cirrus CDB89712 evaluation board mappings' CONFIG_MTD_CDB89712 $CONFIG_MTD_CFI $CONFIG_ARCH_CDB89712dep_tristate ' CFI Flash device mapped on StrongARM SA11x0' CONFIG_MTD_SA1100 $CONFIG_MTD_CFI $CONFIG_ARCH_SA1100 $CONFIG_MTD_PARTITIONSdep_tristate ' CFI Flash device mapped on DC21285 Footbridge' CONFIG_MTD_DC21285 $CONFIG_MTD_CFI $CONFIG_ARCH_FOOTBRIDGE $CONFIG_MTD_PARTITIONSdep_tristate ' CFI Flash device mapped on Lubbock board' CONFIG_MTD_LUBBOCK $CONFIG_MTD_CFI $CONFIG_ARCH_LUBBOCK $CONFIG_MTD_PARTITIONSdep_tristate ' CFI Flash device mapped on the FortuNet board' CONFIG_MTD_FORTUNET $CONFIG_MTD_CFI $CONFIG_ARCH_FORTUNET $CONFIG_MTD_PARTITIONSdep_tristate ' CFI Flash device mapped on Epxa10db' CONFIG_MTD_EPXA10DB $CONFIG_MTD_CFI $CONFIG_MTD_PARTITIONS $CONFIG_ARCH_CAMELOTdep_tristate ' CFI Flash device mapped on PXA CerfBoard' CONFIG_MTD_PXA_CERF $CONFIG_MTD_CFI $CONFIG_ARCH_PXA_CERF $CONFIG_MTD_PARTITIONSdep_tristate ' NV-RAM mapping AUTCPU12 board' CONFIG_MTD_AUTCPU12 $CONFIG_ARCH_AUTCPU12#wpq add S3C2410 的CFI配置dep_tristate ' CFI Flash device mapped on S3C2410' CONFIG_MTD_S3C2410 $CONFIG_MTD_CFIfi

5. 修改Makefile文件

在HHARM2410-R3/kernel/drivers/mtd/maps/ Makefile文件中加入如下语句(当然要根据你的实际情况写啊？！)：#wpq addobj-$(CONFIG_MTD_S3C2410) += s3c2410_wpq.o

6.配置内核使其支持jffs2

说明：这里要特别注意Memory Technology Devices (MTD)的选项支持及其子项

RAM/ROM/Flash chip drivers ---<

Mapping drivers for chip access ---<

的选项支持；

还有File systems下选项支持。##################################***********************#############################################Linux Kernel v2.4.18-rmk7-pxa1 ConfigurationLinux Kernel v2.4.18-rmk7-pxa1 Configuration------------------------------------------------------------------------------+-------------------- Memory Technology Devices (MTD) --------------------+| Arrow keys navigate the menu. >Enter< selects submenus ---<. || Highlighted letters are hotkeys. Pressing >Y< includes, >N< excludes, || >M< modularizes features. Press >Esc<>Esc< to exit, >?< for Help. || Legend: [*] built-in [ ] excluded >M< module > < module capable || +---------------------------------------------------------------------+ || | >*< Memory Technology Device (MTD) support | || | [*] Debugging | || | (3) Debugging verbosity (0 = quiet, 3 = noisy) | || | >*< MTD partitioning support | || | >*< MTD concatenating support | || | > < RedBoot partition table parsing | || | > < Command line partition table parsing | || | > < ARM Firmware Suite partition parsing | || | --- User Modules And Translation Layers | || | >*< Direct char device access to MTD devices | || | >*< Caching block device access to MTD devices | || > < FTL (Flash Translation Layer) support | || | > < NFTL (NAND Flash Translation Layer) support | || | RAM/ROM/Flash chip drivers ---< | || | Mapping drivers for chip access ---< | || | Self-contained MTD device drivers ---< | || | NAND Flash Device Drivers ---< | || +---------------------------------------------------------------------+ |+------------------------| +---------v(+)--------------------------------------------------------+ |+-------------------------------------------------------------------------+| >Select< > Exit < > Help < |+---------------------------------------------------Linux Kernel v2.4.18-rmk7-pxa1 Configuration------------------------------------------------------------------------------+---------------------- RAM/ROM/Flash chip drivers -----------------------+| Arrow keys navigate the menu. >Enter< selects submenus ---<. || Highlighted letters are hotkeys. Pressing >Y< includes, >N< excludes, || >M< modularizes features. Press >Esc<>Esc< to exit, >?< for Help. || Legend: [*] built-in [ ] excluded >M< module > < module capable || +---------------------------------------------------------------------+ || |>*< Detect flash chips by Common Flash Interface (CFI) probe | || |>*< Detect JEDEC JESD21c compatible flash chips | || |[ ] Flash chip driver advanced configuration options | || |>*< Support for Intel/Sharp flash chips | || |> < Support for AMD/Fujitsu flash chips | || |> < Support for RAM chips in bus mapping | || |> < Support for ROM chips in bus mapping | || |> < Support for absent chips in bus mapping | || |[ ] Older (theoretically obsoleted now) drivers for non-CFI chips | || | | || | | || +---------------------------------------------------------------------+ |+-------------------------------------------------------------------------+| >Select< > Exit < > Help < |+-------------------------------------------------------------------------+Linux Kernel v2.4.18-rmk7-pxa1 Configuration------------------------------------------------------------------------------+-------------------- Mapping drivers for chip access --------------------+| Arrow keys navigate the menu. >Enter< selects submenus ---<. || Highlighted letters are hotkeys. Pressing >Y< includes, >N< excludes, || >M< modularizes features. Press >Esc<>Esc< to exit, >?< for Help. || Legend: [*] built-in [ ] excluded >M< module > < module capable || +---------------------------------------------------------------------+ || | >*< CFI Flash device in physical memory map | || | (800000) Physical start address of flash mapping | || | (800000) Physical length of flash mapping | || | (2) Bus width in octets | || | >*< CFI Flash device mapped on S3C2410 | || | | || | | || | | || | | || | | || | | || +---------------------------------------------------------------------+ |+-------------------------------------------------------------------------+| >Select< > Exit < > Help < |+-------------------------------------------------------------------------+Linux Kernel v2.4.18-rmk7-pxa1 Configuration------------------------------------------------------------------------------+----------------------------- File systems ------------------------------+| Arrow keys navigate the menu. >Enter< selects submenus ---<. || Highlighted letters are hotkeys. Pressing >Y< includes, >N< excludes, || >M< modularizes features. Press >Esc<>Esc< to exit, >?< for Help. || Legend: [*] built-in [ ] excluded >M< module > < module capable || +---------------------------------------------------------------------+ || | [ ] Quota support | || | > < Kernel automounter support | || | > < Kernel automounter version 4 support (also supports v3) | || | > < Reiserfs support | || | > < ADFS file system support | || | > < Amiga FFS file system support (EXPERIMENTAL) | || | > < Apple Macintosh file system support (EXPERIMENTAL) | || | > < BFS file system support (EXPERIMENTAL) | || | >*< Ext3 journalling file system support (EXPERIMENTAL) | || | [ ] JBD (ext3) debugging support | || | >*< DOS FAT fs support | || > < MSDOS fs support | || | >*< VFAT (Windows-95) fs support | || | > < EFS file system support (read only) (EXPERIMENTAL) | || | > < Journalling Flash File System (JFFS) support | || | >*< Journalling Flash File System v2 (JFFS2) support | || | (2) JFFS2 debugging verbosity (0 = quiet, 2 = noisy) | || | >*< Compressed ROM file system support | || | [*] Virtual memory file system support (former shm fs) | || | >*< Simple RAM-based file system support | || | > < ISO 9660 CDROM file system support | || | > < Minix fs support| > < FreeVxFS file system support (VERITAS VxFS(TM) compatible) | || | > < NTFS file system support (read only) | || | > < OS/2 HPFS file system support | || | [*] /proc file system support | || | [*] /dev file system support (EXPERIMENTAL) | || | [*] Automatically mount at boot | || | [ ] Debug devfs | || | [*] /dev/pts file system for Unix98 PTYs | || | > < QNX4 file system support (read only) (EXPERIMENTAL) | || | > < ROM file system support | || | >*< Second extended fs support| [ ] Debug devfs | || | [*] /dev/pts file system for Unix98 PTYs | || | > < QNX4 file system support (read only) (EXPERIMENTAL) | || | > < ROM file system support | || | >*< Second extended fs support | || | > < System V/Xenix/V7/Coherent file system support | || | > < UDF file system support (read only) | || | > < UFS file system support (read only) | || | Network File Systems ---< | || | Partition Types ---< | || | Native Language Support ---<| +--v(+)---------------------------------------------------------------+ |+-------------------------------------------------------------------------+| >Select< > Exit < > Help < |+-------------------------------------------------------------------------+

7．制作jffs2映象

首先取得jffs2的制作工具：mkfs.jffs2（可从网上取得）执行如下命令即可生成所要的映象：chmod 777 mkfs.jffs2 //取得mkfs.jffs2的执行权限，即mkfs.jffs2成为可执行文件./mkfs.jffs2 －d jffs2/ －o jffs2.img //生成jffs2文件映象，其中目录jffs2可以是任意的目录，这里的jffs2是我新建的一个目录

8．Jffs2的应用

对于ppcboot、zImage、ramdisk.image.gz向romfs一样正常烧写；以上三项烧写完之后，接着烧写jffs2.img，具体烧写如下：tftp 30800000 jffs2.imgfl 1800000 30800000 20000 （其中20000可根据jffs2的大小适当调整，理论上只要比jffs2.img略大即可，但要为20000的整数倍）特别注意：要想使我们做的jffs2文件系统更加的人性化，我们还可以在ramdisk.image.gz的mnt/etc/init.d/rc$文件中加入如下指令以便启动时自动挂载jffs2文件系统。Mount －t jffs2 /dev/mtdblock/4 /mnt //其中的/dev/mtdblock/4是flash上的jffs2分区。

9．以上配置烧写完成之后就可启动我们的系统，对jffs2分区尽情的添加和删除了，添加的东东再不会因断电而丢失了，呵呵就到这了。