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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

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