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DM648 ubl BOOT

yi daisheng
Prodigy 30 points

   how can i get  the ubl booting  from DM648  NOR  FLASH 。

   In my new projiect ,i used  a  piece of   DM648.  In ccs  emulation mode ,i can load my projiect correct and run normally.And then i want  my projiect can run from NOR FLASH.Afer i  write my  projiect an ubl into the  NOR FLASH,i found my projiect  can't  work. Through the UBL  printing infomation ,i found   no  infomation print, there even no waveform  in the uart  tx pin.so i think  the ubl  did 't work. And then  i  use the ccs to read the register value of  BOOTCFG register ,the   value is 0x019d0004,the are all wright. I don't know why the ubl can't work?

  is there anything wrong with my Schematic or other problem? Some people say that  some pins of  the DM648 should pullup/down,When the rbl is run. Is this is the problem.

  I want  to say that the NOR FLASH  can read write ok in ccs emulation mode.

 

  • 0
    TI__Expert 8260 points

    The DM648 ubl expert on vacation. I am checking with some other people. I will get back to you as soon as hear from them.

    Regards, Srirami.

  • 0 in reply to srirami
    Prodigy 130 points

    Now if the DM648 ubl expert is still on vacation, I am run into the same question. The bootcfg pins are all right and the bootcfg reg is also right. After the flash burning is completed, power up the board, the UBL can run succ, but the APP could not run. And if I debug the UBL, it runs rightly and the App program run rightly too. How can I solve this porblem? please give me some tips.
    Thank you
    zhu