0x00000020 embedded system_error ai_generated true

MPU故障：在地址0x20001000处非特权访问特权区域

MPU fault: unprivileged access to privileged region at address 0x20001000

ID: embedded/arm-mpu-fault-unprivileged-access

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88%修复率
86%置信度
1证据数
2024-01-10首次发现

版本兼容性

版本状态引入弃用备注
ARM Cortex-M7 r1p0 active — — —
FreeRTOS 10.4.6 with MPU support active — — —

根因分析

MPU区域配置不匹配：在非特权模式下运行的代码尝试读取或写入标记为仅特权访问的内存区域。

English

MPU region configuration mismatch: code running in unprivileged mode attempted to read or write a memory region marked as privileged-only.

generic

官方文档

https://developer.arm.com/documentation/den0013/latest/ARM-MPU

解决方案

  1. Set MPU region attribute to 'privileged read-write, unprivileged execute never' for sensitive areas. Example: MPU->RBAR = (0x20001000 & MPU_RBAR_ADDR_Msk) | MPU_RBAR_VALID_Msk | (0 << MPU_RBAR_REGION_Pos); MPU->RASR = (0x3 << MPU_RASR_AP_Pos) | MPU_RASR_XN_Msk;
  2. Switch offending task to privileged mode by setting configUSE_TASK_FPU_SUPPORT to 1 and using vTaskPrioritySet to adjust.

无效尝试

常见但无效的做法:

  1. 85% 失败

    Disabling MPU entirely removes protection but does not fix root cause; security or safety requirements may be violated.

  2. 95% 失败

    Increasing stack size does not resolve MPU access violations; fault is due to privilege level, not stack depth.