开机死机

tq2440 128rom，启动死机，下载正常，等用了一段时间后，不能开机，停留在开机画面，
串口打印信息如下，是不是那个nand Flash，发现好几个不能启动的都是这个一个型号的问题



##### Eboot for TQ2440/SKY2440 #####
#####     www.embedsky.net     #####

Microsoft Windows CE Bootloader for TQ2440/SKY2440 Version 6.0 Built Sep  2 2013

Press [ENTER] to launch image stored on boot media, or [SPACE] to enter boot monitor.

Initiating image launch in 0 seconds.
Launching image from boot media ...
OEMPlatformInit: IMAGE_TYPE_RAMIMAGE
+=OEMVerifyMemory+ dwStartAddr:0x80200000  dwLength:0x4
RAM image 0xa 0x80200003
+=OEMVerifyMemory+ dwStartAddr:0x80201000  dwLength:0x4
RAM image 0xa 0x80201003
waitforconnect
INFO: OEMLaunch: Jumping to Physical Address 0x30201000h (Virtual Address 0x80201000h)...