# docs/working/hardware/

Board bring-up, platform bring-up, and performance-tuning notes.

- **[performance-profiling/](performance-profiling/)** — ARM64
  optimizations, profiler notes, ASM optimization guides.
- **[platform-integration/](platform-integration/)** — Platform abstraction
  layer notes, historical L4Re integration docs (`L4RE_INTEGRATION*`,
  `L4RE_DICTIONARY_ALLOCATION*`, `l_4_re_blkio_endpoints*` — see the
  HISTORICAL note on L4Re in `.claude/CLAUDE.md`), Raspberry Pi build notes.
- `PGO_GUIDE.adoc` — Profile-guided optimization build guide.
- `PLATFORM_BUILD_GUIDE.adoc` — Cross-platform / cross-architecture build
  guide.

## See also

- [`docs/formal/dev-guide/README.md`](../../formal/dev-guide/README.md) —
  the practitioner book this material feeds (platform-support chapters).
- [`docs/working/README.md`](../README.md) — the full `working/` layout.
- [Project root](../../../README.md)