Error: Driver 'ecap' is already registered, aborting... after successful eMMC flash with Stretch IoT

After successfully flashed the eMMC with latest (October 2017) Stretch IoT and by booting from eMMC, the system works fine, except for an error shown after boot (2-3 seconds after prompting for login):

beaglebone login: [ 48.493475] Error: Driver ‘ecap’ is already registered, aborting…

[ 49.076151] Error: Driver ‘ecap’ is already registered, aborting…

I assume I can live with that, but why occurs this error on a clean flash and how can be avoided ?

Board is BBB rev. C, powered from a 5V / 4A supply, currently operated in remote console mode / serial terminal using the UART header & a 3.3V FTDI USB adapter.