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AM4376: NAND flash support

Thomas Yang55737
Expert 4821 points
Part Number: AM4376

Hi Expert,

After customer upgraded NAND Flash from 2K+64bytes to 2K+128 spare bytes on AM4376 board,  AM4376 can not boot successfully any more. In AM4376 userguide, it looks like AM4376 can not support 2K+128 spare bytes NAND Flash directly,  it that true? if yes, is there any other method to boot 2K+128 spare bytes NAND Flash?

  • 0
    TI__Guru**** 393215 points

    Hi,

    Thomas Yang55737 said:
    it looks like AM4376 can not support 2K+128 spare bytes NAND Flash directly, is that true?

    No, this is not true. 2K+128 spare bytes NAND is supported, but your customer needs to change the ECC from BCH8 to BCH16. See Figure 5-15 in the TRM.

  • 0 in reply to Biser Gatchev-XID
    TI__Expert 4821 points

    Thanks, Biser, The table is clear, Selecting between BCH8 and BCH16 ECC scheme is done by ROM code, right? There are nothing need to do from user side.

    but why the feature list in above picture doesn't show that it can  support 2K+128 spare, is there any special steps which need user to finish to support 2K+128 spare?

  • 0 in reply to Thomas Yang55737
    TI__Guru**** 393215 points

    Thomas Yang55737 said:
    Selecting between BCH8 and BCH16 ECC scheme is done by ROM code, right?

    Correct.

    Thomas Yang55737 said:
    There are nothing need to do from user side.

    Not correct, they need to flash the NAND with the correct ECC.

    Thomas Yang55737 said:
    why the feature list in above picture doesn't show that it can  support 2K+128 spare

    Please read the entire section about NAND boot, esp. 5.2.6.4.2.3.