en:xu3_building_u-boot [ODROID Wiki]

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===== U-boot =====
===== Toolchain =====
Click one of the site to download toolchain to build U-boot. Please note that this toolchain is for U-boot, there is another toolchain to build Linux kernel.
  * [[http://dn.odroid.com/toolchains/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux.tar.bz2|Download Bootloader Tool chain(arm-linux-gnueabihf-4.7)]]
Once the download is done, extract the tarball to **/opt/toolchains/**.

If the '/opt/toolchains' directory does not exist in host pc, then create the directory.
<code>
$ sudo mkdir -p /opt/toolchains
$ sudo tar jxf gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux.tar.bz2 -C /opt/toolchains/
</code>
In order to add the toolchain path to PATH, paste below lines to **$HOME/.bashrc**.
<code>
export PATH=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux/bin:$PATH
export CROSS_COMPILE=arm-linux-gnueabihf-
</code>
You can apply the change if you login again or import 
to apply this change, login again or evaluate **$HOME/.bashrc** with source command.
<code>
$ source ~/.bashrc
</code>
You can check if the toolchain installed above works properly while checking the version of toolchain. If you can find **gcc version 4.7.3** at the end of the line, the toolchain is well installed.
<code>
$ arm-linux-gnueabihf-gcc -v
COLLECT_LTO_WRAPPER=/opt/toolchain/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux/bin/../libexec/gcc/arm-linux-gnueabihf/4.7.3/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: /cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/src/gcc-linaro-4.7-2013.04/configure --build=i686-build_pc-
linux-gnu --host=i686-build_pc-linux-gnu --target=arm-linux-gnueabihf --prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install -
-with-sysroot=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-languages=c,c++,fortran --
enable-multilib --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3-d16 --with-float=hard --with-pkgversion='crosstool-NG linaro-1.13.1-4.7-2013.04-
20130415 - Linaro GCC 2013.04' --with-bugurl=https://bugs.launchpad.net/gcc-linaro --enable-__cxa_atexit --enable-libmudflap --enable-libgomp --enable-
libssp --with-gmp=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-
mpfr=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-mpc=/cbuild/slaves/oorts/crosstool-
ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-ppl=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-
linux/.build/arm-linux-gnueabihf/build/static --with-cloog=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-
gnueabihf/build/static --with-libelf=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-
host-libstdcxx='-L/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static/lib -lpwl' --enable-
threads=posix --disable-libstdcxx-pch --enable-linker-build-id --enable-gold --with-local-prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-
gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-c99 --enable-long-long --with-mode=thumb
Thread model: posix
gcc version 4.7.3 20130328 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04)gcc version 4.4.3 (GCC) 
</code>
===== Checkout & compile =====
You can checkout **U-boot** source tree from **[[https://github.com/hardkernel/u-boot/tree/odroidxu3-v2012.07|Hardkernel's Github]]**.
<code>
$ git clone https://github.com/hardkernel/u-boot.git -b odroidxu3-v2012.07
</code>
Before you compile **U-boot**, you must configure for **ODROID-XU3** with following command.
<code>
$ cd u-boot
$ make odroid_config
</code>
And finally you can compile **U-boot**. 
<code>
$ make
</code>

Then you can start to build u-boot image, **u-boot.bin**. This will create **u-boot/u-boot.bin**. You can also add **-j** option for fast compile.

===== Installation =====
ODROID-XU3/4 must have the secure boot enabled boot loader. There are four components of boot loader bl1.bin.HardKernel, bl2.bin.HardKernel, u-boot.bin and tzsw.bin.HardKernel)\\
u-boot.bin file can be generated by u-boot source code. But bl1.bin.HardKernel, bl2.bin.HardKernel and tzsw.bin.HardKernel blobs can be found in u-boot/sd_fuse/hardkernel directory.

<WRAP  left round tip 100%>
  * If you don't change the early hardware initialization (DRAM/KVM init), just update the u-boot.bin. The u-boot.bin doesn't need the signing process.

  * bl2.bin.HardKernel/bl1.bin.hardkernel/tzsw.bin.hardkernel can be supplied as a binary format due to Samsung's policy.

  * **You need to sign the bl2.bin with Hardkernel's private key to make it bootable.**

  * **If you want to contribute your patch, apply it to our u-boot github admin. Or, contact "odroid.uboot@gmail.com"**

  * **And we will publically release the signed bl2 image within 48 hours if there is any update.**

  * To flash the updated images on your MicroSD card, refer the scriptor file sd_fusing.sh in sd_fuse/hardkernel directory.

  * ** To update the boot loader area in the eMMC, must use the [[en:adb_fastboot_install|Fastboot Tool]]. **

  * ** If the boot loader area is corrupted, use the [[emmc_recovery_xu3|eMMC Recovery]] process. **

  * For eMMC update, you need a fastboot driver and micro-USB cable.
</WRAP>


==== Installation to blank card ====
We provide the script, **sd_fuse/hardkernel/sd_fusing.sh**, this helps you to install the bootloader into your blank card MicroSD.
  - Insert your card to USB card reader and attach to USB host port of your desktop.
  - Check the device path of your USB card reader.
  - Install the bootloader binaries using **sd_fuse/hardkernel/sd_fusing.sh**.
<code>
$ cd sd_fuse/hardkernel
$ ./sd_fusing.sh <device/path/of/your/card>
</code>

==== Installation using fastboot ====
If you can boot your **ODROID-XU3/4** already and want to install a new **u-boot.bin** built by you. Fastboot helps you to install a **u-boot.bin** into your board.

u-boot.bin install
<code>
$ sudo fastboot flash bootloader u-boot.bin
</code>

bl1.bin install
<code>
$ sudo fastboot flash fwbl1 sd_fuse/hardkernel/bl1.bin.hardKernel
</code>

bl2.bin install
<code>
$ sudo fastboot flash bl2 sd_fuse/hardkernel/bl2.bin.hardKernel
</code>

tzsw.bin install
<code>
$ sudo fastboot flash tzsw sd_fuse/hardkernel/tzsw.bin.hardKernel
</code>


If installation is done, you care reboot your **ODROID-XU3** with fastboot.
<code>
$ sudo fastboot reboot
</code>
==== Updating from Linux ====
You also can update U-boot from Linux with **dd** command. After building U-boot, copy **u-boot.bin** into your **ODROID-XU3**. Then do the command below in order to flash your U-boot image to MicroSD.
<code>
$ sudo dd if=u-boot.bin of=<device/path/of/your/card> seek=63
$ sudo sync
</code>