各位大神，请指点。
用 TMS320DM6437 EVM板子，烧写程序到Nand flsh 自启动。
使用程序
(1) evmdm6437_v2\tests\video_colorbars\Debug\video_colorbars.out
(2) evmdm6437_v2\tests\led\Debug\led.out
(3) dvsdk_1_11_00_00\examples\video_preview\evmDM6437\Debug\video_preview.out
1、制做AIS文件
Y:\work\TI\dm6437\flashburn\spraag0e\ais_utility\bin>genAIS.pl -otype bin -i xxx.out
-o xxx.bin -bootmode nand
AIS File Generation Complete
2、配置拔码开关到nand boot
3、烧写AIS文件到nand flash, 烧写都正常。
Starting test of NAND Flash...
Starting NANDWriter.
Initializing NAND flash...
Manufacturer ID = 0x00000020
Device ID = 0x00000076
Pages Per Block = 0x32
Number of Blocks = 0x4096
Bytes Per Page = 0x512
Total blocks: 4096
Total pages: 131072
Total bytes: 67108864
Enter the File Name
Y:\work\TI\dm6437\flashburn\spraag0e\ais_utility\bin\video_preview.bin
Number of blocks needed for writing: 0x0000000B
Attempting to start in block number 0x00000001
Erasing blocks 0x00000001 through 0x0000000B.
Writing 512 bytes of data:
NAND Flash: Writing data was successful!
4、断电重启
（1）、（2）程序都能正常自启动。
（3）程序不能自启动，不知什么问题？
