From: Pierre Ossman <drzeus@drzeus.cx>
To: Madhusudhan c <cr.madhusudhan@gmail.com>
Cc: linux-kernel@vger.kernel.org, philipl@overt.org
Subject: Re: MMCv4 support (8-bit support missing)
Date: Wed, 18 Apr 2007 10:46:52 +0200 [thread overview]
Message-ID: <4625DAFC.4000208@drzeus.cx> (raw)
In-Reply-To: <ff1613620704162359w62df9e0ao6c43215a767bd706@mail.gmail.com>
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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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next prev parent reply other threads:[~2007-04-18 8:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-17 6:59 MMCv4 support (8-bit support missing) Madhusudhan c
2007-04-17 15:15 ` Philip Langdale
2007-04-18 8:46 ` Pierre Ossman [this message]
2007-04-18 11:53 ` Madhusudhan c
2007-04-18 14:21 ` Pierre Ossman
2007-04-19 14:04 ` Madhusudhan c
2007-04-19 16:25 ` Pierre Ossman
2007-04-20 11:21 ` Madhusudhan c
2007-04-20 16:12 ` Philip Langdale
2007-04-24 5:03 ` Pierre Ossman
2007-04-26 3:34 ` Madhusudhan c
2007-04-27 6:20 ` Pierre Ossman
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