By this patch, the MMC controller actually used is configured by CONFIG_MMC_INDEX at compile time? I.e. setting CONFIG_MMC_INDEX to 1 will use mmc1, 2 will switch to mmc2 and CONFIG_MMC_INDEX 3 will switch to mmc3?

If I got this right, do you think we can do this at runtime? E.g. implementing a custom command

select_mmc <# of mmc controller to be used>

?

With this, we could switch to mmc2 by doing something like

select_mmc 2

and afterwards all mmc read/write access will go to mmc2.

What do you think?

Surely possible. As you known, there is no interface for selecting device. Can I add new command for that? (E.g. mmcselect <device num>)

And I want to change the mmcinit command too. I.e. getting dev num by argument. like this

mmcinit <device num>

If that is not in, we must select mmc device before mmcinit. How about this? There exist any side effects?

Thanks :) Minkyu Kang