NVM_ERR_BBT_INIT embedded runtime_error ai_generated true

NVM: Bad block manager failed to initialize on chip 0

ID: embedded/nvm-bad-block-manager-failure

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
1Evidence
2023-08-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
NAND flash driver v2.1.0 active — — —
FreeRTOS+IO v1.3.0 active — — —
STM32CubeFW_F4 v1.27.0 active — — —

Root Cause

NAND flash bad block table (BBT) is corrupted or the reserved block area is worn out, preventing the BBT from loading.

generic

中文

NAND闪存坏块表损坏或保留块区域磨损，导致坏块表无法加载。

Official Documentation

https://www.st.com/resource/en/application_note/an3320-nand-flash-management-on-stm32-microcontrollers-stmicroelectronics.pdf

Workarounds

  1. 75% success Force BBT rebuild by erasing the reserved block area and reinitializing: `nand_erase(dev, reserved_block_start, reserved_block_count); nand_bbt_init(dev);` 
    Force BBT rebuild by erasing the reserved block area and reinitializing: `nand_erase(dev, reserved_block_start, reserved_block_count); nand_bbt_init(dev);`
  2. 85% success Use a fallback BBT stored in a separate NOR flash or EEPROM, then copy it to NAND: `memcpy(nand_bbt, fallback_bbt, bbt_size); nand_bbt_apply(dev);` 
    Use a fallback BBT stored in a separate NOR flash or EEPROM, then copy it to NAND: `memcpy(nand_bbt, fallback_bbt, bbt_size); nand_bbt_apply(dev);`

中文步骤

  1. Force BBT rebuild by erasing the reserved block area and reinitializing: `nand_erase(dev, reserved_block_start, reserved_block_count); nand_bbt_init(dev);`
  2. Use a fallback BBT stored in a separate NOR flash or EEPROM, then copy it to NAND: `memcpy(nand_bbt, fallback_bbt, bbt_size); nand_bbt_apply(dev);`

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Mass erase removes all data including the BBT, but does not recreate the BBT structure; the manager will still fail because the reserved area is not reinitialized.

  2. 80% fail

    The configuration change only affects future BBT creation; the existing corrupted BBT is still loaded and fails.