So I think the safest approach is to only raise the clock to about 200% (320 Mhz).
I am also very curious which peripherals still work at that frequency and if we even get wifi working, it would be great (but I don't count on it).
If you have a "simple" procedure for me, I could test that too. I'd like to test:
- can we raise the clock speed and then also lower it again to "normal" settings
- what will still work at the raised speed
- if wifi doesn't work, can be make a procedure where wifi is temporarily shut down (there is SDK code for that), clock raised, do the work, clock reset and then enable wifi again. Maybe it even works without temporarily shutting down wifi.
- just as the flash clock is probably influenced by the PLL clock (SPI peripheral), the HSPI peripherical will probably too. I may keep working, but we'd need to adjust the dividers to keep the proper frequency.