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If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

AM620-Q1: [VALEO] [AM625-Q1] [SDK V.10]: Implementation to Auto detect NAND Flash chip using ECh command

AM625-Q1: AM620-Q1: [VALEO] [AM625-Q1] [SDKLA v10.01.10.04]: Bug in Bad Block management for last page option

Marwan Refaat
Prodigy 35 points

Part Number: AM625-Q1

Hello,

Due to a recent change in NAND chip, we will need to enable scanning of the last page for bad block markers.
For reference, to detect/mark a bad block, we will need to check the first, second, and last pages of a block (Pages 0,1,63).  

While looking through the `nand_base.c` file inside the U-Boot package(SDKLA AM62x (v10.01.10.04)), we found it was possible to enable the last page scanning option by enabling the NAND_BBT_SCANLASTPAGE chip option.

However, during analysis and testing of the feature, we discovered a bug that prevents this feature from functioning correctly.

image.png
 
As shown in the image above, if both NAND_BBT_SCANLASTPAGE and NAND_BBT_SCAN2NDPAGE are enabled, it will cause the following incorrect behavior:

  1. Mark last page of selected block
  2. Mark first page of next block

A similar logical error also exists in the bad block check function. 

To fix this issue, we have added the following modifications attached in the file below (Please convert .txt file to .patch file for easy use):

 nand_base.c 0001-NAND-Bad-Block-Management-Fix.txt 

Please let us know if there are any issues with this change/fix. 

  • 0
    TI__Guru* 78690 points

    Hi Marwan,

    In general, u-boot writes the Bad Block Marker (BBM) to the OOB area in the first and/or the second page within a erasable block.
    Writing the BBM to additional pages does not typically improve reliability but can introduce compatibility issues or slow down your system's boot process.

    This is one reference on bad block management in AM64x ROM on GPMC-NAND booting
    [FAQ] Bad Block management in AM64x ROM on GPMC-NAND booting 

    1/. What is the gpmc-nand device on the Valeo board?
    2/. Is there a special requirements to writer the BBM to multiple pages, (i.e 0, 1, 63) within a erasable block?

    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 35 points

    Hello Hong,

    1. There is not a single NAND device we will be supporting; rather, we will support multiple NAND device variants by reading their ONFI parameter page and adjusting accordingly.

    2. There are some NAND suppliers that require BBM in multiple pages as shown below.


    Is this feature supported through a different method than I described in my original question above? If that is the only way, then it is not correctly functioning.


  • 0 in reply to Marwan Refaat
    TI__Guru* 78690 points

    Hi Marwan,
    I checked with Linux SDK 10.0.7.4 on AM62-LPSK board.
    It looks like BBM is placed only in the first byte of the first page OOB area within a erasable gpmc-nand block in the u-boot.
    Best,
    -Hong

    Fullscreen am62-lp_nand_bb#200000.log Download 
    U-Boot SPL 2024.04-ti-gfda88f8bcea3 (Jul 26 2024 - 11:00:12 +0000)
SYSFW ABI: 4.0 (firmware rev 0x000a '10.0.8--v10.00.08 (Fiery Fox)')
SPL initial stack usage: 13392 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.10.0(release):v2.10.0-367-g00f1ec6b87-dirty
NOTICE:  BL31: Built : 16:09:05, Feb  9 2024

U-Boot SPL 2024.04-ti-gfda88f8bcea3 (Jul 26 2024 - 11:00:12 +0000)
SYSFW ABI: 4.0 (firmware rev 0x000a '10.0.8--v10.00.08 (Fiery Fox)')
SPL initial stack usage: 1904 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed


U-Boot 2024.04-ti-gfda88f8bcea3 (Jul 26 2024 - 11:00:12 +0000)

SoC:   AM62X SR1.0 HS-FS
Model: Texas Instruments AM62x LP SK
EEPROM not available at 0x50, trying to read at 0x51
Board: AM62-LP-SKEVM rev E2
DRAM:  2 GiB
Core:  83 devices, 32 uclasses, devicetree: separate
NAND:  1024 MiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from nowhere... OK
In:    serial
Out:   serial
Err:   serial
Net:   eth0: ethernet@8000000port@1
Hit any key to stop autoboot:  2  0 
=> nand info

Device 0: nand0, sector size 256 KiB
  Page size         4096 b
  OOB size           128 b
  Erase size      262144 b
  ecc strength         8 bits
  ecc step size      512 b
  subpagesize       1024 b
  options       0x0000400c
  bbt options   0x00000000
=> mtd list
List of MTD devices:
* nand0
  - device: nand@0,0
  - parent: memory-controller@3b000000
  - driver: gpmc-nand
  - path: /bus@f0000/memory-controller@3b000000/nand@0,0
  - type: NAND flash
  - block size: 0x40000 bytes
  - min I/O: 0x1000 bytes
  - OOB size: 128 bytes
  - OOB available: 142 bytes
  - ECC strength: 8 bits
  - ECC step size: 512 bytes
  - bitflip threshold: 6 bits
  - 0x000000000000-0x000040000000 : "nand0"
	  - 0x000000000000-0x000000200000 : "NAND.tiboot3"
	  - 0x000000200000-0x000000400000 : "NAND.tispl"
	  - 0x000000400000-0x000000600000 : "NAND.tiboot3.backup"
	  - 0x000000600000-0x000000a00000 : "NAND.u-boot"
	  - 0x000000a00000-0x000000a40000 : "NAND.u-boot-env"
	  - 0x000000a40000-0x000000a80000 : "NAND.u-boot-env.backup"
	  - 0x000000a80000-0x000040000000 : "NAND.file-system"
* spi-nand0
  - device: flash@0
  - parent: spi@fc40000
  - driver: spi_nand
  - path: /bus@f0000/bus@fc00000/spi@fc40000/flash@0
  - type: NAND flash
  - block size: 0x40000 bytes
  - min I/O: 0x1000 bytes
  - OOB size: 128 bytes
  - OOB available: 80 bytes
  - 0x000000000000-0x000008000000 : "spi-nand0"
	  - 0x000000000000-0x000000080000 : "ospi_nand.tiboot3"
	  - 0x000000080000-0x000000280000 : "ospi_nand.tispl"
	  - 0x000000280000-0x000000680000 : "ospi_nand.u-boot"
	  - 0x000000680000-0x0000006c0000 : "ospi_nand.env"
	  - 0x0000006c0000-0x000000700000 : "ospi_nand.env.backup"
	  - 0x000002000000-0x000007fc0000 : "ospi_nand.rootfs"
	  - 0x000007fc0000-0x000008000000 : "ospi_nand.phypattern"
=> nand bad

Device 0 bad blocks:
=> nand markbad 0x200000
block 0x00200000 successfully marked as bad
=> nand bad

Device 0 bad blocks:
  0x00200000
=> nand dump 0x200000
Page 00200000 dump:
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OOB:
	00 ff ff ff ff ff ff ff
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	ff ff ff ff ff ff ff ff
=> nand dump 0x201000
Page 00201000 dump:
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
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        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff
OOB:
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
        ff ff ff ff ff ff ff ff
=>

  • 0 in reply to Hong Guan64
    Prodigy 35 points

    Hello Hong,

    From what I see, this is the default behavior, but it is supposedly configurable using the NAND_BBT_SCAN2NDPAGE and NAND_BBT_SCANLASTPAGE flags I described above.

    Does this mean that the SDK does not support the marking of bad blocks in the second and last pages of a block?

    Best,
    Marwan

  • 0 in reply to Marwan Refaat
    TI__Guru* 78690 points

    Hi Marwan,

    Yes, BBM is logged in the first byte of the first page OOB within a erasable block in the default u-boot.

    It looks like the NAND_BBT_SCAN2NDPAGE/NAND_BBT_SCANLASTPAGE flag is not typically enabled in u-boot, but is instead triggered automatically based on the NAND chip's manufacturer ID and internal properties. For example, Samsung & Hynix MLC NAND device, and Toshiba & AMD devices.
    - Samsung
    https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/drivers/mtd/nand/raw/nand_samsung.c?h=12.00.00.07#n99
    - Hynix
    https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/drivers/mtd/nand/raw/nand_hynix.c?h=12.00.00.07#n72
    - Toshiba
    https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/drivers/mtd/nand/raw/nand_toshiba.c?h=12.00.00.07#n68

    Triggering the flag in the code based on the the NAND chip's manufacturer ID would ensure consistency between u-boot and kernel...If the bootloader and kernel disagree on where to look for bad block markers, they may accidentally write to a block one considers "good" while the other knows it is "bad," leading to data corruption.

    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 35 points

    Hello Hong,

    I appreciate the examples provided; however, my original statement is very clear:

    When both the NAND_BBT_SCAN2NDPAGE and NAND_BBT_SCANLASTPAGE flags are enabled, bad block marking and detection does not function correctly.


    Please confirm this behavior on your end, and review the fix mentioned above. 

    Best, 
    Marwan

  • 0 in reply to Marwan Refaat
    TI__Guru* 78690 points

    Hi Marwan,
    I think your inquiry is on the nand core functions on BBM/BBT handling in u-boot, and also might correlate to how kernel handling them.
    I'd recommend to post your question to the u-boot mailing list.
    u-boot@lists.denx.de
    Best,
    -Hong