HAL_FLASH_ERROR_WRP embedded config_error ai_generated true

Error: flash write protection violation at sector 5

ID: embedded/flash-write-protection-violation

Also available as: JSON · Markdown · 中文
90%Fix Rate
85%Confidence
1Evidence
2025-01-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
STM32Cube FW_F4 V1.27.1 active — — —
STM32Cube FW_L4 V1.17.2 active — — —
IAR EWARM 8.50.6 active — — —

Root Cause

Flash sector is write-protected via option bytes or WRP register, preventing programming or erase operations.

generic

中文

通过选项字节或 WRP 寄存器对闪存扇区进行了写保护，阻止了编程或擦除操作。

Official Documentation

https://www.st.com/resource/en/reference_manual/dm00031020.pdf

Workarounds

  1. 90% success Disable write protection via option bytes: HAL_FLASH_OB_Unlock(); FLASH_OB_WRPConfig(OB_WRP_SECTOR_5, DISABLE); HAL_FLASH_OB_Launch(); 
    Disable write protection via option bytes: HAL_FLASH_OB_Unlock(); FLASH_OB_WRPConfig(OB_WRP_SECTOR_5, DISABLE); HAL_FLASH_OB_Launch();
  2. 95% success Use STM32CubeProgrammer to clear protection: connect to target, go to Option Bytes, disable WRP for sector 5, apply. 
    Use STM32CubeProgrammer to clear protection: connect to target, go to Option Bytes, disable WRP for sector 5, apply.

中文步骤

  1. Disable write protection via option bytes: HAL_FLASH_OB_Unlock(); FLASH_OB_WRPConfig(OB_WRP_SECTOR_5, DISABLE); HAL_FLASH_OB_Launch();
  2. Use STM32CubeProgrammer to clear protection: connect to target, go to Option Bytes, disable WRP for sector 5, apply.

Dead Ends

Common approaches that don't work:

  1. Erase entire flash memory using mass erase 80% fail

    Mass erase also respects write protection; protected sectors remain unerased.

  2. Change linker script to place data in a different sector 65% fail

    The target sector is still write-protected; linker change only redirects writes but does not remove protection.