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ubl can't run on dm6446 BZWTA

Other Parts Discussed in Thread: TMS320DM6446

I download the newest ubl code from http://arago-project.org/files/releases/davinci-psp_3.x.0.0-r37/sources/flash-utils-davinci.tar.gz, but after flash the bin file to the board, the board can not start with no printing. the cpu we use is TMS320DM6446 BZWTA and flash chip is k9f1208r0c,   but it works ok on TMS320DM6446AZWT.  I don't know the difference between them,  Do I need to modify some code ?  so please help me.