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  1. I was able to build the linux-5.2.14-rt7 kernel and replace the linux-4.4.184-rockchip64 kernel on the Armbian_5.91_Rockpro64_Debian_buster_default_4.4.184_desktop.7z image and it appears to be working fine.
  2. linux-5.2.10 is the latest kernel for which there is an -rt patch. I have previously had problems with 4.4 being horribly slow under rt_preempt.
  3. I am running armbian buster Armbian_5.91_Rockpro64_Debian_buster_default_4.4.184_desktop.img. I need rt_preempt in order to run linuxcnc. I started with the 5.0.21.tar.gz kernel source from <> and the rt_preempt patch 5.0.21-rt16.patch.gz from <>. I applied the patch to the kernel source and compiled it on a 4gb RockPro64. It boots fine into a remote terminal using ssh but there is no display on my HDMI monitor. The white LED is showing but the red LED is not lit. I had an earlier version of linux-5.0-rt running on armbian stretch so I mistakenly thought this would be a walk in the park. Any ideas where to start looking? Alan