linux-kernel - Re: [PATCH v2 2/2] mtd: spinand: micron: fixing the offset for OOB

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Message-ID: <01925ff8-1d19-a729-429a-89866fad319f@sberdevices.ru>
Date:   Tue, 22 Aug 2023 19:57:11 +0300
From:   Martin Kurbanov <mmkurbanov@...rdevices.ru>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
CC:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        <kernel@...rdevices.ru>
Subject: Re: [PATCH v2 2/2] mtd: spinand: micron: fixing the offset for OOB

Hi Miquel,

On 22.08.2023 16:35, Miquel Raynal wrote:
> Hi Martin,
> 
> mmkurbanov@...rdevices.ru wrote on Tue, 22 Aug 2023 15:25:34 +0300:
> 
>> The first 4 bytes are reserved for bad block data.
> 
> Are you sure about that? I've never seen 4-bytes BBM.

Yes, I'm sure. I have checked in all the relevant datasheets:
----------------------------------------------------------------------------------
|        Name        | Max Byte | Min Byte |  Area   |        Description        |
|                    | Address  | Address  |         |                           |
|--------------------+----------+----------+---------+---------------------------|
| MT29F2G01ABAGD [1] |          |          |         |                           |
|--------------------|          |          |         |                           |
| MT29F2G01ABBGD [2] |          |          |         |                           |
|--------------------|   803h   |   800h   |         |                           |
| MT29F1G01ABAFD [3] |          |          |         |                           |
|--------------------|          |          |         |                           |
| MT29F4G01ADAGD [4] |          |          |         |                           |
|--------------------+----------+----------| Spare 0 | Reserved (bad block data) |
| MT29F4G01ABAFD [5] |          |          |         |                           |
|--------------------|          |          |         |                           |
| MT29F4G01ABBFD [6] |          |          |         |                           |
|--------------------|  1003h   |  1000h   |         |                           |
| MT29F8G01ADAFD [7] |          |          |         |                           |
|--------------------|          |          |         |                           |
| MT29F8G01ADBFD [8] |          |          |         |                           |
----------------------------------------------------------------------------------

Note: to view the datasheet on the Micron (https://www.micron.com/) website, you need
to register.

Links:
  [1] https://datasheet.lcsc.com/lcsc/1912111437_Micron-Tech-MT29F2G01ABAGDWB-IT-G_C410863.pdf - page 45
  [2] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m79a_2gb_1_8v_nand_spi.pdf - page 46
  [3] https://datasheet.lcsc.com/lcsc/2209201030_Micron-Tech-MT29F1G01ABAFDWB-IT-F_C2905686.pdf - page 46
  [4] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m79a_ddp_4gb_3v_nand_spi.pdf - page 46
  [5] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m70a_4gb_3v_nand_spi.pdf - page 47
  [6] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m70a_4gb_1_8v_nand_spi.pdf - page 49
  [7] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m70a_ddp_8gb_3v_nand_spi.pdf - page 48
  [8] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m70a_ddp_8gb_1_8v_nand_spi.pdf - page 48

-- 
Best Regards,
Martin Kurbanov