public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
From: Andy Pont <andy.pont@sdcsystems.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] MMC interfaces on AM335x
Date: Tue, 26 Aug 2014 13:57:23 +0100	[thread overview]
Message-ID: <01cf01cfc12d$4c33b560$e49b2020$@pont@sdcsystems.com> (raw)

Hello,

I am working on a port of U-Boot to a custom hardware platform based on the
TI AM3354.  According to the schematics from the hardware design company,
the AM3354 has a 4bit MMC interface (MMC0) which has been connected to a uSD
card connector.
There is a second interface (8bit) connected to GPMC signals which is
connected to a Micron eMMC device labelled as MMC1.

U-Boot and the Linux kernel will be stored in a separate SPI flash device
and the eMMC card will hold the root file system and the uSD card for
removable storage.  Am I correct in thinking that if U-Boot boots with no
uSD card installed the eMMC device will be accessed as device 0 e.g.

U-Boot> fatload mmc 0 ...

but if it boots with a uSD card fitted then the eMMC device will be device
1, e.g.

U-Boot> fatload mmc 1 ...

Is there any way to force U-Boot always to map the eMMC device as device 0?

Thanks,

Andy.

             reply	other threads:[~2014-08-26 12:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-26 12:57 Andy Pont [this message]
     [not found] <53fc8458.0b5ab40a.49d7.fffff9f5SMTPIN_ADDED_BROKEN@mx.google.com>
2014-08-26 15:17 ` [U-Boot] MMC interfaces on AM335x Tom Rini

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='01cf01cfc12d$4c33b560$e49b2020$@pont@sdcsystems.com' \
    --to=andy.pont@sdcsystems.com \
    --cc=u-boot@lists.denx.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox