Can the OPI5 be Configured to Run LCNC?

Yes cpu 0-3 A55 and cpu 4-7 A76.
4x A55 and 2x2 A76
Not sure if core 5,7 are a pair or 6,7.
To "overclock" the A76 to 2.4ghz is just simply enabling the overlay. The original filename is "rockchip-rk3588-opp-oc-24ghz.dtbo".

If you tell me which devices you've configured that might use the same resources I could try that.
 

I found an interesting thing: in dev folder I have a ttyFIQ0 that you don't have and I found that it should be the debug port!
 
Most probably the correct way is to disable it and then enable ttyS2.. or renaming it.
Could be?

That's exactly what I did with the overlay I made in Fragment@1.

Now I've disabled that overlay and it's back.
 

royka wrote:

isolcpus=2,5,7 instead of 5,7 because I saw it in your cmdline, does it make a difference in latency?

If it helps, the Odroid N2+ I played with had BIG/LITTLE cores, first 4  cores were big, last 2 little. 
Best performance was isolcpus=2,3,4,5

Ah, ok.. tomorrow I will try step by step, for example, I try to disable FIQ0 without enable S2..

in boot.cmd I have:
line 26: if test "${console}" = "display" || test "${console}" = "both"; then setenv consoleargs "console=tty1"; fi
line 27: if test "${console}" = "serial" || test "${console}" = "both"; then setenv consoleargs "console=ttyS2,1500000 ${consoleargs}"; fi

correct? finally based on your suggestion we have console=display, so the second line should not executed..
I found that with last version of kernel it's changed here.. but I don't want to rebuild all..

rodw wrote:

If it helps, the Odroid N2+ I played with had BIG/LITTLE cores, first 4  cores were big, last 2 little. 
Best performance was isolcpus=2,3,4,5

Ok did the preempt_rt kernel work? That's funny I would've thought that isolcpus=0-3 irqaffinity=4 or 5 works better in that case, probably it's not as simple as I thought. For the Opi5 it might help indeed to isolate 4-7 instead of 5,7.
How was the latency on the s922x? Did a test with the s912 which worked surprisingly well, perhaps that kernel also works on the s922x