使用国嵌的裸板体验程序，加载后无法执行，跑飞了，是怎么回事。

使用国嵌的裸板体验程序，加载后无法执行，跑飞了，是怎么回事，是不是SDRAM有问题。下面是串口打印，


Enter your selection: 7
USB host is connected. Waiting a download.

Now, Downloading [ADDRESS:c000000h,TOTAL:444490]
RECEIVED FILE SIZE:  444490 (434KB/S, 1S)
## Starting application at 0x0C000000 ...
undefined instruction
pc : [<0c000004>]    lr : [<33d0d634>]
sp : 33cbd728  ip : ffffffff  fp : 33cbd992
r10: 33cbd892  r9 : 00000000  r8 : 33cbffdc
r7 : 33cbd992  r6 : 00000002  r5 : 33cbd848  r4 : 0c000000
r3 : 00000002  r2 : 50000000  r1 : 33cbd848  r0 : 00000001
Flags: nZCv  IRQs on  FIQs off  Mode SVC_32
Resetting CPU ...

*** Warning - bad CRC or NAND, using default environment



##### EmbedSky BIOS for SKY2440/TQ2440 #####
Press Space key to Download Mode !

#####    Boot for Nor Flash Main Menu   #####
#####     EmbedSky USB download mode     #####

[1] Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
[2] Download Eboot (eboot.nb0) to Nand Flash
[3] Download Linux Kernel (zImage.bin) to Nand Flash
[5] Download CRAMFS image to Nand Flash
[6] Download YAFFS image (root.bin) to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
[b] Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[n] Enter TFTP download mode menu
[o] Download u-boot to Nor Flash
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] quit from menu
Enter your selection:

他提供的程序不一定适合我们的板子