FYI: Espressif have (finally) released a test toolchain for our PSRAM issue:

https://github.com/espressif/esp-idf/issues/2892

Linux
Windows
OSX

Apparently, we need to include the following flags:

CFLAGS+=-mfix-esp32-psram-cache-dupldst
CXXFLAGS+=-mfix-esp32-psram-cache-dupldst

This is a preliminary test fix only, so not for general release, but worth trying.

Regards, Mark