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help flashing omapl137--big program

Hi, I am working with a project, using the omapl137 .

My program is really big and cannot be fitted into IRAM totally,  .Text and .bss and etc are put in SDRAM.

I am trying to make it bootable from nand flash using AISGen tool. It doest not boot.

But after I cut off almost all my code and variables thus make it fit into IRAM totally, it boot from nand flash and works well.

What should I do ?

I have tried to configure the PLL and EMIFB by AISGen when generating ais image. but it does not work either. :(

I am really confused and stuck with this issue.

Can anyone help me ?

I would really appreciate your kind instruction.