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AM3352: SYSBOOT[9] issue

Jerry Huang6
Prodigy 10 points
Part Number: AM3352

Hi,

We are using a custom board, based on the AM335x Eval Board, and our NAND chip is from Micron (MT29F16G08ABACAWP-ITZ:C).

There are differences between versions of our board, but no any change between AM3352 and NAND chip since first version.

However, we found some version of our board need SYSBOOT[9] pull-up(high) and some need pull-down(low) for SYSBOOT[9].

According to the reference manual(SPRUH73P), initially high and low for SYSBOOT[9] indicates "ECC done by ROM or NAND".

Could we have more detail information about that?

We don't know why some board need SYSBOOT[9] pull-up and some are pull-down.

In wrong setting case, we can not boot up AM3352, and always see "CCC"...

  • 0
    TI__Guru**** 170625 points

    Hi Jerry,

    Have a look at the explanation right before Table 26-18. ECC Configuration for NAND Boot:
    "In addition ECC computation done by the ROM can be turned off completely by using SYSBOOT[9]. This is particularly useful when interfacing with NAND devices that have built in ECC engines."

    If you SYSBOOT[9] = 0x0 => ECC computation is done by ROM code.
    If you use NAND with built in ECC engine => SYSBOOT[9] = 0x1 => ECC computation is handled by nand device.

    See also below e2e threads for more info:

    Also I see sysboot9 map to register control_status[17] waiten  0x0: ignore wait input, 0x1 use wait input

    Regards,
    Pavel