Madhusudhan c wrote: > > Suppose a host controller is capable of suporting 8-bit and it tells > the core that it can support 8-bit. Now the card that is plugged in > might or might not support 8-bit based on the type of the card. There > is no field in the ext_csd which will tell you what bus width the card > can support. >
I've looked through the MMC 4.2 spec and I see nothing in it that even hints that 8-bit support might be optional. So as it stands, the bus testing is still out. Rgds Pierre
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