Rework for usd card in SD mode and 4 bit, not only spi, plus code library..

[Jp]

Hello

could you suggest us the best rework to support SD mode in four bits mode for the M5 stack, hardware and firmware, Library available in Arduio, ....
The purpose is to get the same base for all of us..

Schematics with suggested reworks ?
And code Library when available...

Waiting for this improvement when available and new versions..
Thanks

jp