檢視U-boot的原始碼

== source ==
* <nowiki>git clone https://github.com/gonzoua/u-boot-pi.git</nowiki>
* <nowiki>svn co file:///var/svn/rpi_uboot/trunk</nowiki>

== toolchain ==
* <nowiki>git clone https://github.com/raspberrypi/tools</nowiki>

== build ==
* export ARCH=arm
* export CROSS_COMPILE=arm-linux-gnueabi-
* make rpi_b

== prepare SD card for your u-boot ==
* ./tools/mkimage/imagetool-uncompressed.py u-boot-pi/u-boot.bin
* cp kernel.img RASPBIAN_BOOT_PARTATION

== boot to kernel from USB ==
* prepare your zImage in usb disk, and you should try another usb port if not working while load to ram
* U-Boot> usb start
** use usb sub-system to check avaliable dev and part
*** U-Boot> usb dev
*** U-Boot> usb part {dev}
** use ext2load to check where your zImage existed or not
*** U-Boot> ext2ls usb {dev}:{part}
* U-Boot> ext2load usb {dev}:{part} ${loadaddr} zImage
* U-Boot> bootz ${loadaddr}

==reference ==
* [http://elinux.org/RPi_U-Boot RPi U-Boot]