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DM365: NAND BOOT MODE and GPIO0

KB2603
Expert 1150 points

Hi,

After spending a long time trying to make the DM365 boot, we were about to give up when suddenly we realized that GPIO0 was very important in the boot process when booting in NAND mode.

Since on our custom board, GPIO0 was not used, it is under the BGA and not accessible. So we have to produce another batch of prototypes.

By chance, is there an internal pull-up for DM365 GPIO0?

Rgds

KB

  • 0
    Intellectual 565 points

    Hi KB,

    Unfortunately I think there is a pull-down and it is enabled at power-on reset. (PUPDCTL0[0] = 1)

    We made the same mistake on our 1st run of DM355 boards. We used JTAG to load firmware onto the board after power-on reset. We were able to test all other hardware and make necessary changes so that the 2nd run of boards had both GIO0 fix and also other hardware fixes. So for us it was not a total waste...

    JPM