[Ovmsdev] PSRAM test toolchain

[Mark Webb-Johnson]

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

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

Linux <https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-90-g26d9621-5.2.0-psramfix-20190605.tar.gz>
Windows <https://dl.espressif.com/dl/xtensa-esp32-elf-win32-1.22.0-90-g26d9621-5.2.0-psramfix-20190605.tar.gz>
OSX <https://dl.espressif.com/dl/xtensa-esp32-elf-macos-1.22.0-90-g26d9621-5.2.0-psramfix-20190605.tar.gz>

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

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