Hi,
 
I also didnt get any good doc on the mmc sub system
whereas there are few things that might help
A slide which explains driver stack:-
http://www.slideshare.net/champ_yen/linux-sdmmc-driver-stack
 
Check JEDEC specs (open standard for MMC /eMMC)
http://www.jedec.org/sites/default/files/docs/JESD84-A441.pdf 
 
1. Card
you can look into linux kernel directory drivers/mmc/card/
very few files and easy to understand. can map with JEDEC pdf.
Block.c , queue.c and mmc_test.c
 
2. Core
Generic layer - Not much to be done in this if you are writing a driver or so.
 
3. Host
drivers/mmc/host/
There are few sample mmc driver file are there although
This is specific to your chip. so needed data sheet. Also JEDEC spec can help a bit.

Hope this helps.
Thanks 
Manish
 
On Thu, Nov 10, 2011 at 2:50 PM, loody <miloody@gmail.com> wrote:
hi:
2011/11/10, Asutosh Das <das.asutosh@gmail.com>:
> Hi All
> Please can you let me know if there are any good articles and/or books
> that explain the linux sd/mmc stack that you may know of.
>
> TIA
>
how about posting this message on the linux-mmc mailing list?

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