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