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Using the hwvercmp on FMUv2 HW derivatives built with px4fmu_v3_default
to ues a more targeted startup approach:
1) Detect V3 and V2M
2) On V3 use the external mpu9250 to further discriminate between 2.0
and 2.1. Then only start the devices that are on that version of
the board.
3) Due to HW errata on PixhawkMini deprecate mpu9250.
The mpu9250 will not start reliably on the PixhawkMini
Since we have an ICM20608 and an External Mag the
mpu9250 is not to be used.