Dev board is powered with USB cable from port on good computer.
So, it really shouldn't be the power issue.

And there is still question why it happens with wrover, but not happens with wroom.

I'm quite confident that we don't have shorts between SPI lines.

Is it possible that some pin states during boot affects future behaviour?
Or maybe some pins are left floating and it somehow affects it as well?

Ok, thanks.
I just didn't see it in my profile, so I was not sure that it was actually created.

I tried to report a bug, but somehow I don't see my topic after pressing the "submit" button.
Did anyone see such behaviour before?

While developing firmware we stumbled upon very strange behaviour. We have ESP32-WROVER with SPI chip MCP23S09 connected to it. But after trying to initialize SPI, ESP32 reboots. Interesting thing is that if we use ESP32-WROOM, then this problem does not happen. Here is sample application (can use d...