u-boot on the i.MX6 sabre sd platform in a few commands

Document created by Vincent Stehle Employee on Jun 21, 2013Last modified by Vincent Stehle Employee on Jul 29, 2013
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Here is a quick summary at booting u-boot on the i.MX 6 sabre sd platform.

 

This assumes you already have a "working" Linux development environment with some ARM cross-compilers at hand (e.g. Debian + Emdebian).

 

Get u-boot sources

 

We will use git to fetch the U-Boot sources:

 

  $ git clone git://git.denx.de/u-boot.git

 

This should create a u-boot directory with all the latest sources.

 

Note that for more stability you might want to checkout a release instead of the latest version; to do so, list the available release tags with e.g. git tag -l 'v2*', and git checkout <the-desired-tag>.

 

Compile

 

Assuming your cross compiler is called e.g. arm-linux-gnueabihf-gcc, you can compile by doing:

 

  $ cd u-boot

  $ export CROSS_COMPILE=arm-linux-gnueabihf-

  $ make mx6qsabresd_config

  $ make

 

This should create a number of files, including u-boot.imx.

Put on SD

 

U-boot should reside at offset 1024B of your SD card. To put it there, do:

 

  $ dd if=u-boot.imx of=/dev/<your-sd-card> bs=1k seek=1

  $ sync

 

Your SD card device is typically something in /dev/sd<X> or /dev/mmcblk<X>. Note that you need write permissions on the SD card for the command to succeed, so you might need to su - as root, or use sudo, or do a chmod a+w as root on the SD card device node to grant permissions to users.

 

Boot!

 

Your SD card is ready for booting. Insert it in the SD card slot of your i.MX6 sabre sd platform, connect to the USB to UART port with a serial terminal set to 115200 baud, no parity, 8bit data, power up the platform and you should see something like:

 

  U-Boot 2013.07-rc1-00014-g74771f4 (Jun 20 2013 - 19:05:09)

 

 

  CPU:   Freescale i.MX6Q rev1.2 at 792 MHz

  Reset cause: POR

  Board: MX6Q-SabreSD

  DRAM:  1 GiB

  MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2

  *** Warning - bad CRC, using default environment

 

 

  In:    serial

  Out:   serial

  Err:   serial

  Net:   FEC [PRIME]

  Warning: FEC using MAC address from net device

 

 

  Hit any key to stop autoboot:  0

 

Enjoy!

 

See also...

 

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