Possible mod to use full 8MB PSRAM on ESP32-A1S

[benwaterson]

So these boards have 8MB PSRAM, however arduino can only access 4MB.

Looking at this https://github.com/TridentTD/arduino_esp32_himem/blob/master/example/ESP32_PSRAM_Himem/ESP32_PSRAM_Himem.ino it looks possible to page in the other 4MB for use by the sampler.

Bit out of my coding comfort zone, but might be a starting point to get more ram?

Querying the board you get this (see last line regarding spiram) - rename attached file to chip_info.ino

ESP32 SDK: v4.4.5
ESP32 DEVICE: ESP32-D0WD-V3 rev.3
ESP32 CPU FREQ: 240 MHz
ESP32 XTAL FREQ: 40 MHz
ESP32 APB FREQ: 80.0 MHz
ESP32 FLASH CHIP ID: 1458270
ESP32 FLASH CHIP FREQ: 80.0 MHz
ESP32 FLASH REAL SIZE: 4.00 MB
ESP32 FLASH SIZE (MAGIC BYTE): 4.00 MB
ESP32 FLASH REAL MODE: QIO
ESP32 FLASH MODE (MAGIC BYTE): 0, 0=QIO, 1=QOUT, 2=DIO, 3=DOUT
ESP32 RAM SIZE: 326.86 KB
ESP32 FREE RAM: 302.57 KB
ESP32 MAX RAM ALLOC: 107.99 KB
ESP32 FREE PSRAM: 3043.57 KB
spiram size : 8192.00
Chip_info.txt