关于DM8168 nand flash启动的问题求解

 你用的是哪个版本的RDK为什么是SW ECC？

您好 ，感谢您的回复。。

目前我的板子使用的EZSDK5.05，您说的RDK版本是不是指的DVRRDK的版本。

我很新手，所以不大知道为什么SW ECC。

具体我也是根据DM8168心得之从sd卡烧写到nand  http://blog.csdn.net/luhao806/article/details/7341439 进行操作的。

您好，我将kerenl的也设置成ECC BCH8，将bootcmd中nandecc sw去掉。系统可以加载启动了。但是一直循环报下列错误:

hub 1-0:1.0: over-current change on port 1
hub 2-0:1.0: over-current change on port 1

mtd->read(0x800 bytes from 0xcde000) returned ECC error   from 后一直再变化

mtd->read(0x800 bytes from 0xdfe800) returned ECC error                         

Read of newly-erased block at 0x06c40000 failed: -74. Putting on bad_list       

Read of newly-erased block at 0x06c40000 failed: -74. Putting on bad_list       

JFFS2: marking eraseblock at 06c40000

大概报错几分钟后，就不再报错了。。上面为最后4行指令

噢 这样啊。谢谢。我是有个现成的jffs2的文件系统，所以才用这个的。那我弄个UBIFS再试试吧

我使用UBI文件系统进行flash启动，移植可以成功但在启动过程报错

setenv bootargs 'console=ttyO2,115200n8 noinitrd ip=off mem=256M rootwait=1 rw ubi.mtd=7,2048 rootfstype=ubifs root=ubi0:rootfs init=/init'

VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0)               
Please append a correct "root=" boot option; here are the available partitions:
1f00              64 mtdblock0  (driver?)                                      
1f02              64 mtdblock2  (driver?)                                      
1f04            2432 mtdblock4  (driver?)                                      
1f05             128 mtdblock5  (driver?)                                      
1f06            4352 mtdblock6  (driver?)                                      
1f07          204928 mtdblock7  (driver?)                                      
1f08           50304 mtdblock8  (driver?)                                      
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

我在网上看到相关内容，但是其他人的错误，是在上述指令之前，还报有以下的错误，我这边并没有报该错误。
UBIFS error (pid 1): ubifs_check_node: bad CRC: calculated 0x9f186f96, read 0x3baee010
UBIFS error (pid 1): ubifs_check_node: bad node at LEB 0:0
UBIFS error (pid 1): ubifs_read_node: expected node type 6

UBIFS镜像的对齐要求是2048的整数倍吧，这点我设置是2048的整数倍。

我有把整个nand擦掉，重新烧入，还是报一样的错误。

我向上查看信息，有这么几句指令：

omap2-nand driver initializing                                                  
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xca (Micron )                     
Creating 5 MTD partitions on "omap2-nand.0":                                    
0x000000000000-0x000000260000 : "U-Boot"                                        
0x000000260000-0x000000280000 : "U-Boot Env"                                    
0x000000280000-0x0000006c0000 : "Kernel"                                        
0x0000006c0000-0x00000cee0000 : "File System"                                   
0x00000cee0000-0x000010000000 : "Reserved"                                      
UBI: attaching mtd7 to ubi0                                                     
UBI: physical eraseblock size:   131072 bytes (128 KiB)                         
UBI: logical eraseblock size:    126976 bytes                                   
UBI: smallest flash I/O unit:    2048                                           
UBI: sub-page size:              512                                            
UBI: VID header offset:          2048 (aligned 2048)                            
UBI: data offset:                4096                                           
ata1: SATA link down (SStatus 0 SControl 300)                                   
ata2: SATA link down (SStatus 0 SControl 300)                                   
UBI: max. sequence number:       0                                              
UBI error: ubi_read_volume_table: the layout volume was not found               
UBI error: ubi_init: cannot attach mtd7

感谢你的指导。。我搞定了。昨天太疏忽，少执行了ubinize -o ubi.img -m 2048 -p 128KiB -s 512 -O 2048 ubinize.cfg这一关键步骤。

还有个疑问，我有一张可以启动的2GB SD卡。里面分为BOOT和ROOTFS。但是只有把Uboot，内核，ubi文件系统放在BOOT分区才可以烧写。具体是实施是这样的情况么？

如果你用的是SD卡启动，则uboot，linux kernel放在BOOT分区，文件系统解压后放在ROOTFS分区。