Then it sounds like you really have to do nothing except change the device ID for the different flash. The datasheets look pretty much identical except for the Device ID and the voltages (see screenshow below). The flash chips are described in https://github.com/adafruit/nvm.toml, which is a submodule. You could just edit that locally to add the new chip in the winbond directory, or fork it, or submit a PR to add the chip. And you need to change the flash chip name in mpconfigboard.mk.

In ports/nordic/supervisor/port.c, in port_init(), the brownout detection is set to 2.7v, and you'll need to change that and maybe do brownout detection in a different way. When I read the datasheet section it seemed like the POFCON threshold values might be done different for low voltages and the different voltage configuration.

analogio assumes 3.3v, and you'll want to change common_hal_analogio_analogin_get_reference_voltage(). There may be other things to change in analogio.

Thank you very much. According to your instructions, I successfully ran circuitpython on nrf52840 (1.8V system & 1.8V Flash).

Modifications:

circuitpython/ports/nordic/supervisor/port.c

    power_failure_config.thr = NRF_POWER_POFTHR_V17;

ports/nordic/common-hal/analogio/AnalogIn.c

float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
    // The nominal VCC voltage
    return 1.8f;
}

add W25Q16JWxQ.toml (differenet ID with W25Q16JVxQ.toml)

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