[FR] MKS THR36 and MKS THR42 CAN bus (RP2040 Pico based) remote tool head support

[rondlh]

Is your feature request related to a problem? Please describe.

No

Are you looking for hardware support?

Yes, MKS THR36 and MKS THR42 CAN bus (RP2040 Pico based) tool head support

Describe the feature you want

Support for Marlin on MKS THR36 and MKS THR42.
https://github.com/makerbase-mks/MKS-THR36-THR42-UTC

I tried this code:
https://github.com/thinkyhead/Marlin/tree/bf2_wip_rp2040_skr_pico_PR

Which already makes most things work, but I cannot get the TMC2209 to work in serial configuration mode, if I set the driver to TMC2209 then things go wrong, even the host communication breaks down.
If Marlin can run on this board, then I will work on implementing the CAN communication allowing for a remote tool head in Marlin over CAN.

Additional context

No response

[thisiskeithb]

Duplicate of #7735

[github-actions]

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