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bootloaders-embedded

Use when writing a custom bootloader, jumping to application code, relocating VTOR, or implementing DFU/USB firmware update on Cortex-M. Not for reset-to-main: use baremetal-startup.

.devin/skills/bootloaders-embedded/SKILL.md

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Sep 28, 2026
License
Apache-2.0

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# Embedded bootloaders

## Contract

| Field | Bound contract |
|---|---|
| Trigger | An application must run at a non-zero flash offset, a bootloader must validate and jump to it, a firmware update path (UART, USB DFU, custom protocol) is being written, or an application works when flashed alone but fails when launched by the bootloader. |
| Authority | Read-only: emits the flash layout, validation checks, handoff sequence, and update-safety rules to chat; the user places them in the project. Rollback is not needed because no file is written. No remote mutation. |
| Side effect | Chat output only. |
| Done | The flash partition table, the application validity check, the ordered handoff sequence, and the update commit rule are stated for the target part, and the application-side `VTOR` and linker changes are named. |

## Inputs

- Target part and its flash map: base address, sector or page sizes, and whether it has two banks.