Can you post the text that appears on the reset loop here? Also, just in case, can you post your schematic?

PLL_CLOCK is the clock that is generated by the PLL, as described above. It's 320 or 480MHz, depending on, well, mostly what CPU clock speed you select (80/160 or 240MHz)

Yes, that is all correct. Some nuance: as I said before, having USB-serial-JTAG (or whatever you set with the efuses) on the pin is the default; if your application itself needs to use USB-OTG, it can always switch over once it's booted (and that keeps until the chip is reset). Also, do note that US...

Both work indeed, and it depends on your use case and preference wrt what to use. A (non-pre-emptive multitasking) task scheduler needs the task functions to be written in a specific way, where they always exit at some point. RTOS tasks do not need this, but inter-task communications can be harder a...

Likely you need to run the espefuse.py line at the end of this section.

Additionally, take a look if the EN signal is in spec - on powerup it should be low long enough for Vcc to rise to a proper level. The datasheet has the details iirc.

Sorry, I have no idea. If no one else answers, you could try mailing sales@espressif.com, they should have more details there I think.

You cannot use USB-OTG for JTAG, only flashing. The USB-OTG and USB-serial-JTAG are on the same pins: unless you specifically initialize something that enables the USB-OTG (e.g. TinyUSB) or burn eFuses, the USB-serial-JTAG will be on GPIO19/GPIO20, and you can use that to JTAG-debug it.

Nice I imagine you won't do it in production, but just for reference: the ESP32 does need a proper power-on reset (usually provided by something like an 10K/1U RC network) to properly boot up. Tying the EN to VCC will likely make it work most of the time, but we can't guarantee that functionality.

Yeah, don't do that, it runs the ESP out of specs and we can't guarantee anything wrt how it works in that case. For an explanation, I'm just guessing here, but the CPU runs off the internal PLL. While that PLL it uses the Xtal as a reference, it has its own VCO that gets tuned to run in sync with t...