[Feature Request] Support for switching flash

[amazingfate]

I have a rk3566 board orangepi 3b which has both spi nor flash and emmc. When I get into maskrom mode, rkdeveloptool can only show one flash info. We need a method to switch flashes on device so that it will be much easier to flash images to different storage devices.

[sandyiscool]

+1 Much needed feature for devices that have both spi and emmc attached.

[poltpolt]

+1