Ok, I figured some things. If I understand rc.sensors Script correctly it will try to look for hwcmp AUAV_X21 assuming that hwcmp corresponds to the Output from ver all -> HW Arch where my AUAV-X2.1 identifies itself as PX4FMU V2. I assume this information is fetched from the Boot Loader?
So I tried to perform the steps described in rc.sensors manually. They are:
# External I2C bus
hmc5883 -C -T -X start
# Internal SPI bus ICM-20608-G is rotated 90 deg yaw
mpu6000 -R 2 -T 20608 start
# Internal SPI bus mpu9250 is rotated 90 deg yaw
mpu9250 -R 2 start
The Output is not very encouraging:
mRobotics also lists ICM20602 instead of 20608... maybe a last minute change in Production? Nevertheless mpu6000 -R 2 -T 20602 start does not work either.
Performing MPU9250 test works every second time and any other time kind of disconnects the IMU from the OS.
Any help on this is appreciated.