From: Pierre Ossman <drzeus-list@drzeus.cx>
To: Ian Stirling <ian.stirling@mauve.plus.com>
Cc: madhu chikkature <crmadhu210@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: SDIO card support in Linux
Date: Fri, 01 Sep 2006 17:53:59 +0200 [thread overview]
Message-ID: <44F85797.9070208@drzeus.cx> (raw)
In-Reply-To: <44F85646.4030100@mauve.plus.com>
Ian Stirling wrote:
>>
>> SD mandates a star topology (just a single card per bus), so we'll just
>> force a single card into the list. SD memory cards can actually work on
>> a shared bus, SDIO can not. It's not a big problem in practice though.
>
> Is this true in SD-1 bit mode, or SPI?
Yes, no. :)
> I see nothing on a quick read-through of the abbreviated SDIO spec
> precluding this.
> Of course, it'd mean wire-or'd interrupt lines.
>
The problem is that there is no "king-of-the-hill" mechanism in the SDIO
init sequence (like there is in SD mem). The protocol assumes that the
desired card always receives the command.
Rgds
Pierre
next prev parent reply other threads:[~2006-09-01 15:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-31 15:04 SDIO card support in Linux madhu chikkature
2006-08-31 19:53 ` Pierre Ossman
2006-09-01 15:48 ` Ian Stirling
2006-09-01 15:53 ` Pierre Ossman [this message]
2006-09-05 23:51 ` madhu chikkature
2006-09-06 5:20 ` Pierre Ossman
2006-09-06 23:22 ` madhu chikkature
2006-09-07 14:54 ` Pierre Ossman
2006-09-14 12:01 ` Bhavani
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