分类： LINUX
2009-03-14 19:59:59
在建立文件系统时，2.6.22.1内核挂载yaffs文件系统老是出错，采用cramfs又不能写，所以就决定采用jffs2了。具体方法就是将这个建立好的根文件系统制作成jffs2镜像，烧到FLASH中，改改Linux的启动参数即可。
1.下载jffs2制作工具源码mtd-utils-1.1.0.tar.bz2
2. 解压后编译
#Tar –jxvf mtd-utils-1.1.0.tar.bz2
#cd mtd-utils-05.07.23
#cd util
#make
生成的mkfs.jffs2即为制作jffs2文件系统的工具
3. 制作根文件系统的JFFS2镜像
# mkfs.jffs2 -r /home/nick/rootfs -o rootfs.jffs2 -e 0x4000 --pad=0x800000 –n
各参数的意义：
(1)-r ：指定要做成image的文件夹.
(2)-o : 指定输出image档案的文件名.
(3)-e : 每一块要抹除的block size，预设是64KB.要注意，不同的flash, 其block size会不一样.我的是三星的K9F1208U0B.
(4)--pad （-p）: 用16进制来表示所要输出文件的大小，也就是root.jffs2的大小。很重要的是, 为了不浪费flash空间, 这个值最好符合flash driver所规划的区块大小.这里使用的是8MB.
(5)如果挂载后会出现类似：CLEANMARKER node found at 0x0042c000 has totlen 0xc != normal 0x0 的警告，则加上 -n 就会消失。
(6) 还有的选项，自己看帮助！-h
4. 烧写JFFS2镜像到NAND FLASH
将 rootfs.jffs2下载到NAND FLASH，然后启动开发板。
出现错误：
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0050e154: 0xfbeb instead
开始在网上找原因，后来才知道是因为flash的未使用空间不是全0xff的原因，可以在加载jffs2.img之前，用eraseall对整个mtd设备擦除，或者，在用mk.jffs2生成image的时候，用-p选项填充所有未使用空间为0xff。
所以我用DNW擦除了文件系统所在的那个分区，重新下载启动开发板，OK！成功！
Uncompressing Linux.................................................................................................... done, booting the kernel.
Linux version 2.6.22.1 (nick@localhost.localdomain) (gcc version 3.4.1) #38 Sat Mar 14 19:19:03 CST 2009
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
Machine: SMDK2410
Warning: bad configuration page, trying to continue
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 200.000 MHz, memory 100.000 MHz, peripheral 50.000 MHz
S3C24XX Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists. Total pages: 16256
Kernel command line: noinitrd root=/dev/mtdblock3 init=/linuxrc rootfstype=jffs2 init=/linuxrc console=ttySAC0 115200 mem=64M
irq: clearing subpending status 00000093
irq: clearing subpending status 00000092
PID hash table entries: 256 (order: 8, 1024 bytes)
timer tcon=00090d00, tcnt a2c1, tcfg 00000200,00001030, usec 00001eb8
Console: colour dummy device 80x30
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 61628KB available (2828K code, 287K data, 124K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
S3C2410 Power Management, (c) 2004 Simtec Electronics
S3C2410: Initialising architecture
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics
DMA channel 0 at c4800000, irq 33
DMA channel 1 at c4800040, irq 34
DMA channel 2 at c4800080, irq 35
DMA channel 3 at c48000c0, irq 36
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NetWinder Floating Point Emulator V0.97 (double precision)
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
JFFS2 version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
s3c2410-lcd s3c2410-lcd: no platform data for lcd, cannot attach
s3c2410-lcd: probe of s3c2410-lcd failed with error -22
s3c2410-led initialized
lp: driver loaded but no devices found
ppdev: user-space parallel port driver
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
s3c2410-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2410
s3c2410-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2410
s3c2410-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2410
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: module loaded
Cirrus Logic CS8900A driver for Linux (Modified for SMDK2410)
eth0: CS8900A rev E at 0xe0000300 irq=53, no eeprom , addr: 08: 0:3E:26:0A:5B
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
BAST NOR-Flash Driver, (c) 2004 Simtec Electronics
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c2410-nand s3c2410-nand: Tacls=3, 30ns Twrph0=7 70ns, Twrph1=3 30ns
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)
NAND_ECC_NONE selected by board driver. This is not recommended !!
Scanning device for bad blocks
Bad eraseblock 6 at 0x00018000
Bad eraseblock 7 at 0x0001c000
Bad eraseblock 8 at 0x00020000
Bad eraseblock 9 at 0x00024000
Creating 4 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x00040000 : "Boot"
ftl_cs: FTL header not found.
0x00040000-0x00300000 : "kernel"
ftl_cs: FTL header not found.
0x00300000-0x02000000 : "Rootfs"
ftl_cs: FTL header not found.
0x02000000-0x04000000 : "User"
ftl_cs: FTL header not found.
usbmon: debugfs is not available
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
mice: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2410-i2c s3c2410-i2c: slave address 0x10
s3c2410-i2c s3c2410-i2c: bus frequency set to 390 KHz
s3c2410-i2c s3c2410-i2c: i2c-0: S3C I2C adapter
TCP cubic registered
NET: Registered protocol family 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Empty flash at 0x0046fde8 ends at 0x0046fe00
Empty flash at 0x013b4c2c ends at 0x013b4e00
VFS: Mounted root (jffs2 filesystem).
Freeing init memory: 124K
init started: BusyBox v1.9.2 (2009-03-13 15:19:05 CST)
starting pid 738, tty '': '/etc/init.d/rcS'
/etc/init.d/rcS: line 2: ./etc/host: Permission denied
(none)
*****************mount all**********
*****************Starting mdev******
************************************
*******nick's rootfs 2009.3*********
*********************
************************************
starting pid 747, tty '': '/bin/sh'
Processing /etc/profile... Set search library path in /etc/profile
Set user path in /etc/profile
Set PS1 in /etc/profile
Done
[root@ /]#JFFS2 notice: (736) check_node_data: wrong data CRC in data node at 0x013b5000: read 0x4f1f99be, calculated 0x85ca45db.
[root@ /]#ls
bin dev home linuxrc proc sbin tmp var
boot etc lib mnt root sys usr
本次移植的主要参考：http://blog.chinaunix.net/u1/34474/showart.php?id=486604
在这里衷心的感谢作者！
