The BMI270 firmware is part of the Sensor API : https://github.com/BoschSensortec/BMI270-Sensor-API/blob/da417852e74d8e80e1b5a28956431dcf5fb6ead7/bmi270.c#L60 For most applications, storing the firmware in the Host flash memory is the easiest solution. In case this is not practical you the function bmi270_init should be modified to accommodate the storage of the firmware image elsewhere. o_o
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