Miquel Raynal miquel.raynal at
Mon Aug 3 04:47:27 EDT 2020

Hi Marco,

Marco Felsch <m.felsch at> wrote on Thu, 30 Jul 2020
14:14:25 +0200:

> Hi,
> a customer of us uses micron nand flash devices for their local storage.
> They are now having some troubles with a few devices. Let me start with
> the following:
>   1) We can successfully read the nand id field by:
>      -> select_chip
>      -> cmdfunc(mtd, NAND_CMD_RESET)
>      -> cmdfunc(mtd, NAND_CMD_READID) Addr=0x00
>      -> 8times: read_byte(mtd)  
>      The NAND device response with the following:
>      nand: id_data[0]: 0x2c
>      nand: id_data[1]: 0xdc
>      nand: id_data[2]: 0x90
>      nand: id_data[3]: 0x95
>      nand: id_data[4]: 0x56
>      nand: id_data[5]: 0x0
>      nand: id_data[6]: 0x0
>      nand: id_data[7]: 0x0
>      Accroding the schematic and the datasheet this is right.
>   2) To detect the ONFI compatibility we now issue:
>      -> cmdfunc(mtd, NAND_CMD_READID) Addr=0x20  
>      and getting the expected 'O','N','F','I' signature.
>    3) Now we are trying to Read the PARAM Page by:
>       -> cmdfunc(mtd, NAND_CMD_PARAM)
>       -> try to read the the param page and if not successful try to  
>          read the copies.
>       Here things getting crazy since we are reading all the time '0xff'.
>    4) Since Barebox (Bootloader) can't read the ONFI param page we
>       calculate the values as expected from the param page. But now we
>       can't access BBT (not found) nor we are not able to write to the
>       OOB Area (the chip is not write protected).
> The electrical signals are looking good and since we can retrieve the
> id-data it should be no PCB bug. Did anyone struggled with such problems
> too?
> BTW:
> I also get '0xff' if I send a READ_UNIQUE_ID command and trying to read
> the 16 copies of the 32byte unique-id.
> Any answers are welcome :)

Could you share more details about the situation your customer is
facing? Did this work before? Is this an update? If yes from what
version to what version? Also, is this a Linux or Barebox issue?


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