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TMS320DM6437 NAND flash boot video_preview not work

Hi All :

Try boot-up DM6437 NAND Flash, but not work, Step as below :

1. CCS3.3 load and build video_preview project.

2. genAIS.pl -i video_preview.out -o video_preview.bin -otype bin -bootmode nand

3. CCS3.3 load and run NANDWrite project , write video_preview.bin to nand flash.

4. PowerOFF/ON Target board, but boot failed, no have any response.

BOOTMODE config setting 

  SW1 : 11101000 SW2 : 0011

Can anyone give me some advise ? lose something ?

B.R.

Allen