embedded build_error ai_generated true

arm-none-eabi-ld：段 .data 的 VMA 0x20000000 与段 .bss 的 VMA 0x20000000 在 RAM 区域重叠

arm-none-eabi-ld: section .data VMA 0x20000000 overlaps section .bss VMA 0x20000000 in region RAM

ID: embedded/arm-gcc-section-overlap-in-ram

其他格式: JSON · Markdown 中文 · English
95%修复率
90%置信度
1证据数
2023-11-08首次发现

版本兼容性

版本状态引入弃用备注
ARM GCC 12.3.1 active — — —
GNU ld 2.40 active — — —
STM32CubeIDE 1.14.0 active — — —

根因分析

链接脚本在 RAM 区域中为 .data 和 .bss 段定义了重叠的虚拟内存地址，通常是由于 LMA/VMA 对齐错误或缺少段填充。

English

Linker script defines .data and .bss sections with overlapping virtual memory addresses in RAM region, typically due to incorrect LMA/VMA alignment or missing section padding.

generic

官方文档

https://gcc.gnu.org/onlinedocs/gcc-12.3.0/gnu_lnk.html

解决方案

  1. Edit linker script (.ld file) to add explicit alignment and gap between .data and .bss sections: . = ALIGN(4); .data : { *(.data) } >RAM AT>FLASH; . = ALIGN(4); .bss : { *(.bss) } >RAM; Ensure .bss VMA starts after .data end address, e.g., .bss VMA = .data VMA + SIZEOF(.data) + 4.
  2. Use the linker script's built-in PROVIDE and ASSERT to detect overlap at build time: add ASSERT(SIZEOF(.data) + SIZEOF(.bss) <= LENGTH(RAM), "RAM overflow"); in the script.

无效尝试

常见但无效的做法:

  1. Increase RAM size in linker script (e.g., change RAM length from 64K to 128K) 90% 失败

    Overlap is due to address assignment, not insufficient total RAM; increasing size does not separate overlapping addresses.

  2. Move all variables to .data section by removing __attribute__((section(".bss"))) 80% 失败

    This may shift the problem but not resolve the underlying VMA collision; .data and .bss still share same base address.