docs/develop/support_tiers.rst
MicroPython operates with a set of Support Tier levels for the various ports. Tiers 1, 2 and 3 are the main Tier levels with Tier 1 being the most mature and actively maintained. There is also Tier M for additional ports used primarily for maintenance, development and testing. These Tier levels are defined in the table below.
.. table:: :widths: 40 9 9 9 9
+-----------------------------------------------+--------+--------+--------+--------+ | | Tier 1 | Tier 2 | Tier 3 | Tier M | +-----------------------------------------------+--------+--------+--------+--------+ | builds pass under CI | ✔ | ✔ | ✔ | ✔ | +-----------------------------------------------+--------+--------+--------+--------+ | tests run under CI (where possible) | ✔ | ✔ | ✔ | ✔ | +-----------------------------------------------+--------+--------+--------+--------+ | actively maintained | ✔ | ✔ | | ✔ | +-----------------------------------------------+--------+--------+--------+--------+ | stable Python API | ✔ | ✔ | | | +-----------------------------------------------+--------+--------+--------+--------+ | new features actively developed | ✔ | ✔ | | | +-----------------------------------------------+--------+--------+--------+--------+ | tested on hardware for releases | ✔ | ✔ | | | +-----------------------------------------------+--------+--------+--------+--------+ | prioritized bug reports | ✔ | | | ✔ | +-----------------------------------------------+--------+--------+--------+--------+ | regressions warrant a patch release | ✔ | | | ✔ | +-----------------------------------------------+--------+--------+--------+--------+ | has port-specific documentation | ✔ | | | | +-----------------------------------------------+--------+--------+--------+--------+
Lower Tiers may tick more boxes, but the above table defines the minimum requirements for a port to belong to a Tier.
Tier 1 ports:
Tier 2 ports:
Tier 3 ports:
Tier M ports: