lkml.org 
[lkml]   [2007]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: MMCv4 support (8-bit support missing)
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

[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2007-04-18 10:49    [from the cache]
©2003-2011 Jasper Spaans