px4_add_board( PLATFORM nuttx VENDOR bitcraze MODEL crazyflie 2.1 TOOLCHAIN arm-none-eabi ARCHITECTURE cortex-m4 ROMFSROOT px4fmu_common CONSTRAINED_FLASH DRIVERS distance_sensor/vl53l1x gps optical_flow/pmw3901 pwm_out imu/bosch/bmi088/bmi088_i2c barometer/bmp388 MODULES attitude_estimator_q #camera_feedback commander dataman ekf2 events land_detector landing_target_estimator load_mon local_position_estimator logger mavlink mc_att_control mc_hover_thrust_estimator mc_pos_control mc_rate_control navigator rc_update sensors #temperature_compensation SYSTEMCMDS bl_update dmesg dumpfile esc_calib hardfault_log i2cdetect led_control mixer motor_ramp motor_test mtd nshterm param perf pwm reboot reflect sd_bench system_time top topic_listener tune_control usb_connected ver work_queue )