Enable the targets chapter
- [v0.4.x to v0.5.x](./migration/migration_v4.md)
- [RTFM to RTIC](./migration/migration_rtic.md)
- [Under the hood](./internals.md)
+ - [Cortex-M architectures](./internals/targets.md)
<!--- [Interrupt configuration](./internals/interrupt-configuration.md)-->
<!--- [Non-reentrancy](./internals/non-reentrancy.md)-->
<!--- [Access control](./internals/access.md)-->
