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From: Chris Ball <cjb@laptop.org>
To: Romain Izard <romain.izard.pro@gmail.com>
Cc: linux-mmc@vger.kernel.org
Subject: Re: e⋅MMC forward compatibility
Date: Thu, 28 Nov 2013 15:48:56 +0000	[thread overview]
Message-ID: <867gbsjzmf.fsf@void.printf.net> (raw)
In-Reply-To: <CAGkQfmOjUeKYMq8aosZTyco4Sna4yM_20zGWUG2nWRyX_gwyhw@mail.gmail.com> (Romain Izard's message of "Thu, 28 Nov 2013 15:01:49 +0100")

Hi Romain,

On Thu, Nov 28 2013, Romain Izard wrote:
> The e⋅MMC 5.0 specification has been published by JEDEC on September
> 2013 [1], and contains a note in section B.8, which says: "A host
> system should work properly considering future eMMC version. For
> example, a host system is expected not to exit only due to the
> EXT_CSD_REV[192] value greater than 7 which will be used for next
> e•MMC revision."
>
> Right now, the kernel controls the value of both fields 192 and 194,
> and rejects any device where CSD_STRUCTURE > 2 or EXT_CSD_REV > 7.

Sounds good to me -- want to send a patch?

Thanks,

- Chris.
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>

  reply	other threads:[~2013-11-28 15:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-28 14:01 e⋅MMC forward compatibility Romain Izard
2013-11-28 15:48 ` Chris Ball [this message]
2013-11-29  8:38   ` [PATCH] mmc: Allow forward compatibility for e⋅MMC Romain Izard
2013-11-29  9:55     ` Ulf Hansson
2014-01-28  8:40     ` [PATCH RESEND] " Romain Izard

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