Revision as of 11:20, 1 June 2011 (view source) Manel Caro (talk | contribs) ← Older edit		Revision as of 11:30, 1 June 2011 (view source) Manel Caro (talk | contribs) Newer edit →
Line 93:		Line 93:
	Now we can see all partitions and configurations done in the main gparted window		Now we can see all partitions and configurations done in the main gparted window
−	=== [[Image:Gparted partitions done.png|thumb|center]]Select "Boot flag" for the boot partition ===	+	=== [[Image:Gparted partitions done.png|thumb|center]]Select "Boot flag" for the boot partition ===
	Now we must select the boot flag for the first partition for it we use the right mouse button over the boot partition and select "Manage Flags" option		Now we must select the boot flag for the first partition for it we use the right mouse button over the boot partition and select "Manage Flags" option
	[[Image:Gparted boot flag.png|thumb|center]]Now we have the microsd prepared for copy the boot files		[[Image:Gparted boot flag.png|thumb|center]]Now we have the microsd prepared for copy the boot files
		+
		+	= Boot Partition Structure =
		+
		+	We commented in the theory point the OMAP needs only the MLO (x-loader) file for boot, we will start checking this point.
		+
		+	We will download the x-loader sources from ISEE git.
		+
		+	$ git clone git://git.igep.es/pub/scm/x-loader.git<br>Cloning into x-loader...<br>remote: Counting objects: 1433, done.<br>remote: Compressing objects: 100% (622/622), done.<br>remote: Total 1433 (delta 1054), reused 1128 (delta 809)<br>Receiving objects: 100% (1433/1433), 450.90 KiB, done.<br>Resolving deltas: 100% (1054/1054), done.
		+
		+
		+
		+
	<br><br>		<br><br>

---

Revision as of 11:30, 1 June 2011

Introduction

This how to explains how to boot IGEPv2 or IGEP Module using a microSD card.

Theory

OMAP35xx or DM37xx processors can boot from a microSD. IGEPv2 or IGEP Module uses the microSD card as highest boot priority, it means that the processor try to boot from the microsd card before try to boot from other devices such the OneNand.

Exist some rules for boot from a microSD card.

• The microsd card must be content at latest 2 partitions.
• The first one must be primary partition with the boot flag mark and formated using FAT filesystem.
• All names used in this partition must be msdos names, it means you cannot use a extended names.
• The processor must load a first program called MLO, this program must reside in the first partition, this program it's also called x-loader.

The processor ONLY load and execute the MLO program and ignore all the rest.

Prerequisites

• PC with Linux (We use for this how to Ubuntu 11.04
• MicroSD Card (4 Gbytes - class 4)
• Tools such, fdisk, mkfs.ext3, mkfs.vfat, gparted ...

Preparing the microSD card

Insert a new microsd card in your PC, you should see in your dmesg somthing like this after insert a new microsd card:

mmc0: new high speed SDHC card at address 0001
mmcblk0: mmc0:0001 00000 3.79 GiB
mmcblk0: unknown partition table

Ensure all in your microsd card it's erased:

$ sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1024 count=1024
[sudo] password for jdoe:
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.43556 s, 2.4 MB/s

Install GParted

We will use the gparted program for create the partitions, if you don't have this program installed then you must install it with this command:

sudo apt-get install gparted

GParted

When the install procedure ends you can call the program from your system tools menu or directly using a terminal console.

Create the MSDOS Partition Table

The next step it's create the msdos table partition for it you should click in the "Device" menu and then in the "Create Partition Table" option.

Check the default option it's create a msdos partition table after that you can apply.

Create the BOOT Partition

The Next step it's create the partitions for it you should go to the partition menu and select the "New" option then the application show a window like this:

We will configure the partition as:

• Primary Partition
  
• Format: FAT32
  
• Size: 100 MegaBytes
  
• Label: Boot
  

We must "add" the partition and gparted shows a partitions structure like this.

Create the ROOTFS Partition

The Next step it's create the root filesystem partition.

First you should select the unallocated partition area and then  you should go to the partition menu and select the "New" option then the application show a window like this:
We will configure the rootfs partition as:

• Primary Partition
  
• Format: EXT4
  
• Size: All the Rest
  
• Label: Rootfs
  

At end we will click on "Add" button.

Apply all Changes

Clink on Apply changes button in the main menu after that gparted show a window like this for confirm all operations

We should click on apply button. When the process finish we can see all changes applied

Now we can see all partitions and configurations done in the main gparted window

Select "Boot flag" for the boot partition

Now we must select the boot flag for the first partition for it we use the right mouse button over the boot partition and select "Manage Flags" option

Now we have the microsd prepared for copy the boot files

Boot Partition Structure

We commented in the theory point the OMAP needs only the MLO (x-loader) file for boot, we will start checking this point.

We will download the x-loader sources from ISEE git.

$ git clone git://git.igep.es/pub/scm/x-loader.git
Cloning into x-loader...
remote: Counting objects: 1433, done.
remote: Compressing objects: 100% (622/622), done.
remote: Total 1433 (delta 1054), reused 1128 (delta 809)
Receiving objects: 100% (1433/1433), 450.90 KiB, done.
Resolving deltas: 100% (1054/1054), done.