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Need help rebuilding the UBL

Ok now I get the emulator working using the gel file supplied in LSP2.10 PSP: DM365_26Feb_VPSS_wrknd3a.gel. I can program NAND using NANDEraser, NANDWriter and the UBL and u-boot supplied by LSP2.10 PSP.

Problem now is, I try to rebuild the UBL, using the source code supplied by LSP2.10 PSP. But my UBL does not work. When bootup, it shows:

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TI UBL Version: 1.50

Booting Catalog Boot Loader

BootMode = NAND

Starting NAND Copy...

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Then it stops.

My UBL.out file size is 25K. The LSP2.10 supplied UBL_DM36x_NAND.bin file size is 20k. I dont know why the size difference.

For UBL project CCS build properties, it chooses Unknown TMS470R2X Device, little endianness, TI v4.6.3, eabi(ELF)

When I open my UBL.out file using hex editor, I can see it's ELF file format. But the LSP2.10 supplied UBL_DM36x_NAND.bin seems not ELF format. What is the format?

Or is there any other configurations I should set.

I am using Ti DM365 EVM.

Thanks.