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DM6467 boot problem

I have a DM6467 development board and it was working fine with the pre loaded code.  Then I booted it up and stopped the boot process as it was counting down (I pressed enter in the serial terminal to stop the boot process).  After a while I tried to talk to it via the serial terminal and it would not respond.  When I power cycle the board it sometimes prints "Booting PSP boot loader" then it either hangs or randomly prints partial messages like "Bo"  or "Booti".   I cannot stop the boot process, it does not respond to serial commands.  Is there a way to re-flash the board via JTAG or something?