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For the rockpro 64 the first 2 cores (0,1) are the faster ones. To move the RT processes to cpu1, you can run this script as root (rename to prio.sh)
 

This was the rt kernel I made for the rk3399 back then:
drive.google.com/drive/folders/12VfNmKC3...zaNAk2EN5sHDfeCnnzYX
Maybe you've more luck with using the script (don't forget to hit the reset button in latency-histogram after running the script.)

With the Orange Pi 5 plus, when I split the processes to core 5 and 7 with the script above the latency with base thread is better with Linux 6.13
 

hi no you use a stlink (the green one on the video) to flash a second stlink adapter (the blue one on the video), 
then you take the key that you flashed (the blue one) you connect it to a pc and you use PYOCD with the command pyocd flash .\remora-rt1052-3.1.3.bin --target mimxrt1050_quadspi as in the photo


youtube.com/shorts/kLOyWslSZU0?si=C3GMQaH--oAvvTZk