embedded data_error ai_generated partial

NVM: ECC uncorrectable error at address 0x08010000, data corruption detected

ID: embedded/nvm-ecc-uncorrectable-error

Also available as: JSON · Markdown · 中文
78%Fix Rate
88%Confidence
1Evidence
2024-06-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
STM32Cube_FW_G4 v1.5.0 active — — —
ARM GCC v13.2.1 active — — —
HAL NVM driver v1.0.0 active — — —

Root Cause

Flash memory cell has experienced multiple bit flips exceeding ECC correction capability (SEC-DED), indicating permanent hardware degradation or radiation-induced single event upset.

generic

中文

闪存单元发生多次位翻转，超出ECC纠错能力（SEC-DED），表明永久性硬件退化或辐射引起的单粒子翻转。

Official Documentation

https://www.st.com/resource/en/application_note/an5340-ecc-management-on-stm32-mcus.pdf

Workarounds

  1. 80% success Map out the bad flash sector: use flash controller to mark sector as bad in a bad block table, then relocate application data to a spare sector. Example: HAL_FLASHEx_Erase() the sector and store its address in a dedicated bad block region. 
    Map out the bad flash sector: use flash controller to mark sector as bad in a bad block table, then relocate application data to a spare sector. Example: HAL_FLASHEx_Erase() the sector and store its address in a dedicated bad block region.
  2. 75% success Implement software ECC using Reed-Solomon codes on critical data, and retry reads on ECC error with data reconstruction from redundant copies stored in separate sectors. 
    Implement software ECC using Reed-Solomon codes on critical data, and retry reads on ECC error with data reconstruction from redundant copies stored in separate sectors.

中文步骤

  1. 映射出坏闪存扇区：使用闪存控制器将扇区标记为坏块表中的坏块，然后将应用程序数据重定位到备用扇区。示例：HAL_FLASHEx_Erase()擦除该扇区并将其地址存储在专用坏块区域中。
  2. 对关键数据使用Reed-Solomon码实现软件ECC，并在ECC错误时重试读取，从存储在单独扇区中的冗余副本重建数据。

Dead Ends

Common approaches that don't work:

  1. Re-flash the entire firmware to overwrite corrupted data 90% fail

    Re-flashing writes new data but does not repair the underlying bad flash cell; ECC error will recur at same address.

  2. Disable ECC checking in flash controller 95% fail

    Disabling ECC allows silent data corruption to propagate, leading to undefined behavior and potential system crashes.