===== Overview =====

Setting up ARM toolchain for U-Boot -- for validation, see if it compiles Zedboard:

<code>
$ make zynq_zed_defconfig
</code>

===== The possibilities =====

==== Fedora 30 package gcc-arm-linux-gnu ====

The package:

<code>
$ rpm -qi gcc-arm-linux-gnu
Name        : gcc-arm-linux-gnu
Version     : 8.2.1
Release     : 1.fc30.2
Architecture: x86_64
Install Date: Thu 21 Mar 2019 09:29:31 AM EDT
Group       : Unspecified
Size        : 81242502
License     : GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
Signature   : RSA/SHA256, Sun 03 Feb 2019 05:45:32 PM EST, Key ID ef3c111fcfc659b9
Source RPM  : cross-gcc-8.2.1-1.fc30.2.src.rpm
Build Date  : Thu 31 Jan 2019 01:50:01 PM EST
Build Host  : buildhw-08.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager    : Fedora Project
Vendor      : Fedora Project
URL         : http://gcc.gnu.org
Bug URL     : https://bugz.fedoraproject.org/cross-gcc
Summary     : Cross-build binary utilities for arm-linux-gnu
Description :
Cross-build GNU C compiler.

Only building kernels is currently supported.  Support for cross-building
user space programs is not currently provided as that would massively multiply
the number of packages.
$
</code>

<code>
$ type arm-linux-gnu-gcc
arm-linux-gnu-gcc is /usr/bin/arm-linux-gnu-gcc
$
</code>

For Zedboard:

<code>
$ export CROSS_COMPILE=arm-linux-gnu-
</code>

Seems to work.

==== Xilinx SDK ====

<code>
$ PATH=$PATH:~/xilinx/tools/SDK/2018.3/gnu/aarch32/lin/gcc-arm-linux-gnueabi/bin
</code>

<code>
$ export CROSS_COMPILE=arm-linux-gnueabihf-
</code>

Compiles.

==== Linaro gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz ====

<code>
$ PATH=~/tc/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin:$PATH
</code>

<code>
$ type arm-linux-gnueabihf-gcc
arm-linux-gnueabihf-gcc is /home/rpjday/tc/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
</code>

<code>
$ export CROSS_COMPILE=arm-linux-gnueabihf-
</code>

<code>
$ make zynq_zed_defconfig
$ make
</code>

Seems to work.