boneblack wifi w/ robotics cape - no RC input

[Ivan Riol]

got a black wireless with a robotics cape, have ran the script to enable the dtb for the cape, using image "bone-debian-10.5-iot-armhf-2020-08-25-4gb" with SD card only (no eMMC)....when I run rc_test_drivers i get error for I2C1 and for PRU-PROC...I have read somewhere this could be bogus errors,.....but I cant get Ardupilot to see any RC input, using FrSky SBUS receiver with signal pin to E4 

am at a loss of trying so many things  and images, and kernels, etc...nothing seems to work...actually everything works except RCIO on pru_proc