Hi Pierre/Philip,
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.
Okay. Its possible that my understanding was wrong in the sense that I thought bus testing procedure is mandatory to support 8-bit cards. If 8-bit is mandatory for MMC4 cards, then the changes required in the MMC core to support 8-bit might be simple. Based on host controller cap this can be handled.
Philip asked me about the access to the 8-bit controller. We might not be able to provide you direct access to the hardware platform as it requires involvement of business managers and so on. But can I be of help by testing your code on our platform and leting you know the results? Regards, Madhu On 4/24/07, Pierre Ossman <[EMAIL PROTECTED]> wrote:
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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