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960eef70e8
In ESP-IDF, enabling SPIRAM in menuconfig sets some Kconfig options: - "Wi-Fi Cache TX Buffers" enabled. By default this tries to allocate 32 of these when Wi-Fi is initialised, which requires 54,400 bytes of free heap. - Switches "Type of WiFi TX buffers" from Dynamic to Static. This pre-allocates all of the Wi-Fi transmit buffers. Not a problem if PSRAM is initialised, but it's quite a lot of RAM if PSRAM failed to initialise! As we use the same config for PSRAM & no-PSRAM builds now, this either causes Wi-Fi to fail to initialise (seen on S2) or will eat quite a lot of RAM. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>