The bootloader U-Boot
Contents
Overview
This page is meant to be a starting point for people to learn build a u-boot image and show to people the current status of different u-boot versions for IGEP Processor Boards.
What is U-Boot?
Das U-Boot (Universal Bootloader) is an open source, primary boot loader used in embedded devices. Its primary purpose in the shipping system is to load some operating system.
That means that U-Boot is necessary to perform a certain task, but it's nothing you want to throw any significant resources at. Typically U-Boot is stored in relatively small NOR flash memory, which is expensive compared to the much larger NAND devices often used to store the operating system and the application.
Necessary package
Download & Prepare your U-BOOT
Will be a distintion between NXP-processors products and ARM-processors products.
Commercial Name | U-Boot Series |
---|---|
IGEPv2 DM3730 | ARM |
IGEP COM MODULE DM3730/AM3703 | ARM |
IGEP COM AQUILA AM335x | ARM |
IGEPv5 OMAP5432 | ARM |
IGEP SMARC AM335x | ARM |
IGEP SMARC iMX6 Solo | Freescale-NXP |
IGEP SMARC iMX6 Dual Lite | Freescale-NXP |
IGEP SMARC iMX6 Dual | Freescale-NXP |
IGEP SMARC iMX6 Quad | Freescale-NXP |
Once we know which U-Boot have we will clone the corresponding git repository
U-Boot ARM Serie
Downloading binary files | |
---|---|
Clone the u-boot repo |
Clone the u-boot repository using git address:
or |
Checkout u-boot repo |
Go to the u-boot-arm directory and checkout the isee_v2017.03 as:
|
U-Boot Freescale-NXP Serie
Downloading binary files | |
---|---|
Clone the u-boot repo |
Clone the u-boot repository using git address:
or |
Checkout u-boot repo |
Go to the u-boot-imx directory and checkout the version 2015.04.y as:
|
Once we have downloaded we will execute the file called defconfig, that it variates in function of each model.
Set the board configuration(Prepare your U-BOOT) | ||
---|---|---|
Model | defconfig | Example |
IGEPv2 DM3730 | igep0020_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- igep0020_defconfig
|
IGEP COM Module DM3730/AM3703 | igep0030_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- igep0030_defconfig
|
IGEP COM AQUILA AM335x | am335x_igep0033_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- am335x_igep0033_defconfig
|
IGEPv5 OMAP5432 |
----
| |
IGEP SMARC AM335x | am335x_igep0034_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- am335x_igep0034_defconfig
|
IGEP0046 SMARC Solo |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- xxxxx
| |
IGEP0046 SMARC Dual lite | igep0046_imx6dl_2G_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- igep0046_imx6dl_2G_defconfig |
IGEP0046 SMARC Dual |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- xxxxx | |
IGEP0046 SMARC Quad | igep0046_imx6q_2G_defconfig |
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- igep0046_imx6q_2G_defconfig
|
Build u-boot
After running the defconfig. You can build u-boot by executing this command:
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
- The result for Texas Instruments processor based board will be a MLO and u-boot.img.
- The result for iMX6 processor based will be a u-boot.imx.
You can install these files, for example, in the boot partition of a SD-card.
What next...
After build u-boot you can use it for boot the board, exist several options for boot, check the Hardware Reference Manual about the options available for your board.
- Boot from MicroSD Card.
- Boot from NAND flash.
- Boot from eMMC.
- Boot from USB.
- Boot from Network.