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5509A BOOTLADER

HI

      I'm using a '5509A, and booting from a 24-bit address serial flash. when the file .out is small, Everything works fine - the DSP loads the boot table (verified on a logic analyzer) and GPIO4 goes high, indicating it has finished and can get the corect outcome, but when the file .out is large ,Everything works fine ,then ,not any action.but this code works fine  when loaded from the JTAG debugger,i can not find the probiem.any ideas?

   thinks!