That worked... time to learn about PREEMPT_RT!

Thank you!

Can you post your config.txt? Yup, absolutely... thank you for being willing to help... $ cat /cygdrive/e/config.txt # For more options and information see # http://www.raspberrypi.org/documentation/configuration/config-txt.md # Some settings may impact device functionality. See link above for deta...

I've followed these steps with a B+ "Raspberry Pi Model B+ V1.2", ammending dtoverlay in config.txt to dtoverlay=dtbs_rt/bcm2708-rpi-b-plus.dtb When I reboot I get a rainbow screen. if I comment out the "new" kernel in config.txt all is OK. The image I've installed this on is the most recent. How do...