Messages in this thread | | | Date | Thu, 26 Apr 2007 09:04:26 +0530 | From | "Madhusudhan c" <> | Subject | Re: MMCv4 support (8-bit support missing) |
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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 <drzeus@drzeus.cx> 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 > > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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