OMAP Wireless Connectivity AM18x Preparing SD Card - NLCP

Mobile MMC card preparation

In this section the formatting procedure of Mobile MMC card, partitioning it in to two partitions (FAT and ext2) and then copying the kernel image and filesystem on to it are discussed.
Comments: the following instructions are asumes running on Linux PC

Formatting and Partitioning

• Mobile MMC card minimum size is 1GB and should be 1.8V compatible ( later versions of AM-18 support 3.3v SD cards as well).
• Format the Mobile MMC card in to two partitions one with FAT and another with with ext2 file system. The ext2 partition must be 90% of the size of Mobile MMC card.

Create Partitioning

• There are 2 options To create the SD card partitions:

• Use script
• Use manual commands

• Eject MMC card, and insert it again

Extracting the uImage and filesystem into the Mobile MMC card

• Extract (untar) the boot files ( uImage ) to boot directory <Label1> on the SD card (the FAT partition).

E.g:

tar -xvf boot_partition.tar.gz /media/<Label1>

(Make sure that the image name is 'uImage' on the MMC).

• Extract (untar) the root_partition<date>.tar.gz into the Mobile MMC card partition <Label2> (the ext2 partition-ROOT).
• E.g:

cd /media/ROOT
sudo tar -xvf  <Path>/root_partition<date>.tar.gz 

Close MMC Windows, Eject MMC card ( right click on BOOT/ROOT partition and select Eject ).

Booting up

• Insert the Mobile MMC card in to the SD card slot in the AM1808 EVM board.
• ‘switch on’ the board and now the board will be booting.
• Now you must see that the Linux kernel is booting up and mounting the file system. On the LCD screen of AM1808 EVM, the Matrix GUI comes up.
• Note that before turning off the EVM board, it is recommended to use the command ‘shutdown –h now’ so that the system halts in a proper way.

HOME