Several community projects and third-party vendors publish open-source CM4 carrier board schematics or example designs under permissive licenses. These can be helpful starting points for custom carrier boards:
When using third-party designs:
Raspberry Pi hosts their official design files on GitHub. You do not need to pay for these. cm4 94v0 schematics free
CM4 Datasheet: This is the companion document that defines the pinout of the CM4 connectors (J1 and J2).
If you are an engineer or hobbyist looking to use these files, here is the correct workflow: When using third-party designs:
