SDIO drivers?

Maximus
2006-08-25T09:26:30Z

Hi,
Just going through the linux kernel sources which has support for
SD and MMC.

Wondering whats the difference between SD and SDIO.

What is meant by SDIO ?. (SD + IO) ?.

what is meant by IO part?.

Are any SDIO drivers open source?.

Regards,
Jo