Madhusudhan c wrote: > Hi Pierre/philip, > Hi Madhusudhan,
Feel free to add me as cc in the future if you want me to notice your mail ;) > This is regarding the MMCv4 support that came in as part of the MMC > core of 2.6.20 linux kernel version. > > The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit > support seems to be missing from the MMCv4 support implemented by > Philip Langdale . As soon as hardware with specs is available we'll start hacking. :) > To support 8-bit transfers the core needs to implement "bus testing > procedure". This requires support for CMD19 and CMD14. > > Why is the support for bus testing procedure msiing from the MMCv4 support? > We haven't determined it as necessary, and as Philip commented, most (if not all) controllers cannot properly support the test. Rgds Pierre
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