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.. SPDX-License-Identifier: GPL-2.0+
.. Copyright (C) 2023 Linus Walleij <linus.walleij@linaro.org>
Broadcom Northstar Boards
=========================
This document describes how to use U-Boot on the Broadcom Northstar
boards, comprised of the Cortex A9 ARM-based BCM470x and BCM5301x SoCs. These
were introduced in 2012-2013 and some of them are also called StrataGX.
Northstar is part of the iProc SoC family.
A good overview of these boards can be found in Jon Mason's presentation
"Enabling New Hardware in U-Boot" where the difference between Northstar
and Northstar Plus and Northstar 2 (Aarch64) is addressed.
The ROM in the Northstar SoC will typically look into NOR flash memory
for a boot loader, and the way this works is undocumented. It should be
possible to execute U-Boot as the first binary from the NOR flash but
this usage path is unexplored. Please add information if you know more.
D-Link Boards
-------------
When we use U-Boot with D-Link routers, the NOR flash has a boot loader
and web server that can re-flash the bigger NAND flash memory for object
code in the SEAMA format, so on these platforms U-Boot is converted into
a SEAMA binary and installed in the SoC using the flash tool resident in
the NOR flash. Details can be found in the OpenWrt project codebase.
Configure
---------
.. code-block:: console
$ make CROSS_COMPILE=${CROSS_COMPILE} bcmns_defconfig
Build
-----
.. code-block:: console
$ make CROSS_COMPILE=${CROSS_COMPILE}
$ ${CROSS_COMPILE}strip u-boot
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