linux-kernel - Re: MMCv4 support (8-bit support missing)

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Message-ID: <462D8FA2.5010609@drzeus.cx>
Date:	Tue, 24 Apr 2007 07:03:30 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Madhusudhan c <cr.madhusudhan@...il.com>
CC:	linux-kernel@...r.kernel.org, philipl@...rt.org
Subject: Re: MMCv4 support (8-bit support missing)

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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