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MicroPython Support Tiers
=========================
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:
- esp32
- mimxrt
- rp2
- samd
- stm32
- unix
- windows
Tier 2 ports:
- alif
- embed
- nrf
- renesas-ra
- webassembly
- zephyr
Tier 3 ports:
- cc3200
- esp8266
- pic16bit
- powerpc
Tier M ports:
- bare-arm
- minimal
- qemu
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