It's nice to see M3 support progressing well.
They first mentioned that efforts to add M3 support were starting in February:
> For quite some time, m1n1 has had basic support for the M3 series machines. What has been missing are Devicetrees for each machine, as well as patches to our Linux kernel drivers to support M3-specific hardware quirks and changes from M2. Our intent was always to get to fleshing this out once our existing patchset became more manageable