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    [[rockpiE | ROCK Pi E]] > [[rockpiE/dev | Development]] > [[rockpiE/dev/u-boot | Build U-Boot]]

=== Build ROCK Pi E U-Boot ===

Below is the instructions of how to build U-Boot for ROCK Pi E on a '''HOST PC'''.

==== Get the source code ====

You need Git to get multiple git repositories to build the image.

Install Git if you don't have it.

 sudo apt-get update
 sudo apt-get install git

Clone the source code

 git clone -b stable-4.4-rockpie https://github.com/radxa/u-boot.git
 git clone -b debian https://github.com/radxa/build.git
 git clone -b master https://github.com/radxa/rkbin.git

You will get 

 build  rkbin  u-boot

Directories usage introductions:

* build:
** Some script files and configuration files for building u-boot, kernel and rootfs.
* rkbin: 
** Prebuilt Rockchip binaries, include first stage loader and ATF(Arm Trustzone Firmware).
* u-boot: 
** u-boot as the second stage bootloader

==== Install toolchain from Linaro ====

 wget https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/aarch64-linux-gnu/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz
 sudo tar xvf gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz  -C /usr/local/
 export CROSS_COMPILE=/usr/local/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-
 export PATH=/usr/local/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin:$PATH

Check if Linaro toolchain is the default choice:

 which aarch64-linux-gnu-gcc
 /usr/local/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc

==== Install other build tools ====

 sudo apt-get install gcc-aarch64-linux-gnu device-tree-compiler libncurses5 libncurses5-dev build-essential libssl-dev mtools
 sudo apt-get install bc python dosfstools

==== Build u-boot ====

Need to checkout branch to '''stable-4.4-rockpie'''.

Build u-boot with default '''rock-pi-e-rk3328_defconfig'''.

 ./build/mk-uboot.sh rockpie     #For ROCK Pi E

The generated images will be copied to out/u-boot folder

 ls out/u-boot/
 idbloader.img  rk3328_loader_ddr333_v1.16.250.bin  trust.img  uboot.img

==== Troubleshooting ====

Check [[RockpiE/FAQs |ROCK Pi E FAQs]] first, if it doesn't help, start a new post on the forum https://forum.radxa.com/c/rockpie