Messages in this thread |  | | | Date | Wed, 18 Apr 2007 10:46:52 +0200 | | From | Pierre Ossman <> | | Subject | Re: MMCv4 support (8-bit support missing) |
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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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