View source for CM-T43: U-Boot: Creating a bootable SD card

== Introduction ==
CM-T43 system-on-module uses SPI flash as its main boot storage.
In addition to the on-board SPI flash, the CM-T43 can also boot from an SD card.
This article describes the preparation and boot process using an SD card.

== SD card requirements ==
The CM-T43 firmware can be written as raw data, or as a set of files in a FAT formatted partition.
* If using the raw data option, make sure that:
** The SD card partitions do not start in the first 1MB of the SD card. Otherwise, the partitions may be overwritten by this procedure.
* If using the filesystem option:
** Format the SD-card with FAT16/32
** Use MBR to store partition data

== Installing firmware on an SD card ==
=== Installing firmware as raw data ===
* Insert the SD card into the workstation card reader
* The SD card will be identified as {{filename|/dev/sdX}}, where X is the SD card drive letter.
* Run the following command:
<pre>
dd if=cm-t43-firmware of=/dev/sdX bs=1K seek=320 oflag=dsync
</pre>

=== Installing firmware as files in a FAT formatted partition ===
* Copy the file {{filename|MLO}} located in the images folder into the SD-card partition.
* Copy the file {{filename|u-boot.img}} located in the images folder into the SD-card partition.

== Booting from an SD card ==
* Plug the SD card into the P9 SD card socket of the SB-SOM-T43
* Hold the ALT.BOOT (SW3) button while resetting/powering on the CM-T43 evaluation system
* The CM-T43 will boot from the SD card

== See also ==

* [[CM-T43: U-Boot: Firmware Overview]]
* [[CM-T43: U-Boot: Firmware Update]]
* [http://processors.wiki.ti.com/index.php/SD/MMC_format_for_OMAP3_boot SD/MMC format for OMAP3 boot]

[[Category:U-Boot]]
[[Category:CM-T43]]