.. SPDX-License-Identifier: GPL-2.0+
.. Copyright (C) 2026 Allied Telesis Labs

x220 Platforms
==============

Introduction
------------

The x220 has is a range of L2+ switches using the Marvell AlleyCat3 switch with
integrated ARMv7 CPU. It is also sold under some different brands for different
markets.

- x220-52GP
- x220-52GT
- x220-28GS
- GS980M/52PS
- GS980M/52
- x230-52

DDR Traning (binhdr)
--------------------

The AlleyCat3 uses a binary blob for it's DDR training. This is launched by
the built-in bootloader prior to U-Boot starting.

To generate binary.0 from Marvell's bin_hdr.elf use the following command

.. prompt:: bash $

  arm-softfloat-linux-gnueabi-objcopy -S -O binary bin_hdr.elf \
     board/alliedtelesis/x220/binary.0

Alternatively, it is possible to extract the binary.0 from an existing U-Boot
image

.. prompt:: bash $

   ./tools/dumpimage -T kwbimage -p 1 -o board/alliedtelesis/x220/binary.0 u-boot.kwb