linux-kernel - Re: [RFC][PATCH] MMC: Major restructuring and cleanup

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Date:	Sun, 14 Jan 2007 16:38:01 -0800
From:	Philip Langdale <philipl@...rt.org>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	LAK <linux-arm-kernel@...ts.arm.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] MMC: Major restructuring and cleanup

Pierre Ossman wrote:
 >
> Eeeeww... This is a problem as the SD spec. clearly states the order of
> init commands. So I wouldn't be surprised if we find SD cards that choke
> on the MMC init sequence.
> 
> I guess what we lose by not supporting these is 8 bit data bus, but as
> we do not currently have a controller for that I think the point is moot.

Hrm. Even the MMC 4.1 App Note describes a unified init sequence where SD is
checked first.

So, these cards are essentially useless then. The number of hosts that support
MMC 4 but not SD can probably be counted on no hands. :-)

--phil
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