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linker-scripts

Use when writing a GNU ld script for a bare-metal target, placing code in a flash or RAM region, wiring .data and .bss startup, or fixing a region overflowed error. Not for LTO: use linkers-lto.

.devin/skills/linker-scripts/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Linker scripts

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A bare-metal image needs a GNU ld script: `MEMORY` and `SECTIONS`, VMA versus LMA for `.data`, the symbols startup code copies between, a function placed in a named region, weak default handlers, or a region overflow error. |
| Authority | Reversible local: writes only the linker script and the startup source in the project directory the user names; rollback is reverting those files in version control. No remote mutation. |
| Side effect | New or edited `.ld` and startup files. The image layout changes on the next link. |
| Done | The ELF links, `readelf -S` shows `.data` with an LMA inside flash and a VMA inside RAM, `.bss` and the stack fit the RAM region, and the startup code copies `.data` and zeroes `.bss` between the script's symbols before `main`. |

## Inputs

- Flash and RAM origins and lengths from the datasheet, plus any extra region (CCM, TCM, backup SRAM).