新做了两个板子，插tiny6410核心板，刷了友善光盘里的linux系统，用同一块核心板，有一块可以正常启动，功能正常；另一块无法启动，om3、4接3.3v后可以刷系统，终端打印信息为:
key pressed...
Running from NAND...
##### FriendlyARM Superboot for 6410 #####
[f] Format the nand flash
[p] Download superboot
[v] Download uboot.bin
[k] Download Linux/Android kernel
[y] Download root yaffs2 image
Download root ubifs image
[a] Download Absolute User Application
[n] Download Nboot.nb0 for WinCE
[l] Download WinCE bootlogo
[w] Download WinCE NK.bin
Boot the system
[s] Set the boot parameter of Linux
[d] Download and Run an Absolute User Application
Version: 1150, RAM 256 MiB, NAND(SLC) 256MiB
Please enter your Selection:
按"b"可以启动，功能也正常，OM3、4电平0.53V,能正常启动的板子也是这个电平，
FriendlyARM.ini如下:
#This line cannot be removed. by FriendlyARM(www.arm9.net)
CheckOneButton=No
Action=install
OS= linux
VerifyNandWrite=No
StatusType = Beeper| LED
#################### Linux #####################
Linux-BootLoader = superboot-6410.bin
Linux-Kernel = Linux/zImage_n43
Linux-CommandLine = root=/dev/mtdblock2 rootfstype=yaffs2 init=/linuxrc console=ttySAC0,115200
Linux-RootFs-InstallImage = Linux/rootfs_qtopia_qt4.img
请问这是什么原因？怎么解决？ 
