Table of Contents
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Introduction
Generally Yocto BSP support targets ASSP devices where the hardware itself is fixed. Devices such as Zynq and Zynq Ultrascale+, which also include a programmable fabric, require additional support to describe the custom IP that the developer has designed for the fabric. The meta-xilinx-tools layer provides the recipes to parse an HDF a hardware platform specification file which will generate DTS, extract bitstreams, generate DTS and create BSPs for build low level boot targets. The typical way to add this was to simply put add the HDF/DSA in your local.conf
. This however, has limitations when managing multiple machines or can clutter your local.conf
. This wiki shows two alternative methods to manage your HDFs.objects and package the boot objects with bootgen.
Releases Supported
Xilinx Yocto (Rocko 2.4) rel-v2018.1 and later (Rocko 2.4)
Prerequisites
Creating a Custom Xilinx Yocto Layer
Adding
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a Hardware Platform to Your Yocto Layer
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Local.conf
Add your hardware platform directly to your local.conf.
example-zcu102-zynqmp.conf
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HDF_BASE = "file://"
HDF_PATH = "/path-to/design_1_wrapper.xsa" |
Info |
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You may want to use machine overrides in your local.conf if you have multiple hardware archive files targeting different machines. |
Machine Configuration Method
One way to manage your HDFs hardware platforms is to add them to a machine configuration. In order to do this you need to add a PN override for the external-hdf
recipe. This method binds the hardware with a machine in the machine configuration. The example below uses a local hardware repository external to Yocto.
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example-zcu102-zynqmp.conf
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require conf/machine/zcu102-zynqmp.conf HDF_BASE_pn-external-hdf = "file://" HDF_PATH_pn-external-hdf = "/path-to/Basedesign_Zynq_MPSoC1_wrapper.hdfxsa" |
Bbappend Method
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Another way to manage your HDFs is to add them to a bbappend for the external-hdf recipe. In order to manage multiple hardware designs and multiple machines, you can add the machine override to the HDF_BASE and HDF_PATH variables. This way you can use your layer as the repository for your hardware designs. In the example below, you can export all your hardware designs to the files directory in the external-hdf recipe bbappend of your layer.
Version 2021 and earlier
external-hdf.bbappend
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FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
HDF_BASE_example-zcu102-zynqmp = "file://"
HDF_PATH_example-zcu102-zynqmp = "design_1_wrapper.xsa" |
Version 2022 and later
external-hdf.bbappend
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FILESEXTRAPATHS_prepend := "${THISDIR}/files:" HDF_BASE_:example-zcu102-zynqmp = "file://" HDF_PATH_:example-zcu102-zynqmp = "Basedesign_Zynq_MPSoC1_wrapper.hdfxsa" |
Using a default
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Hardware Platform with a Custom Machine
If you are a software developer, you may not care about the actual bitstream to get started working with software on an evaluation platform such as the ZCU102. However, you still need a base HDF hardware platform to import the PCW configuration for the PS. Xilinx has default HDFs platforms for each platform on GitHub, but those only match the default machine name. If you are working with a custom machine configuration, you need to either use a local HDF hardware platform or trick Yocto into using a compatible HDFplatform. For instance you could chose a naming convention that incorporates the default machine you are targeting, e.g. example-zcu102-zynmp.conf. From this name you can extract the default HDFplatform. The bbappend below shows how you could extend the external-hdf recipe to use one of the default HDFs platforms with your custom machine. Essentially you are creating a link from your machine to the default machine in the working directory.
external-hdf.bbappend
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# attempt to determine a base machine assuming "<prefix><project>-<board>-<arch>" # example: "myproj-zcu102-zynqmp" could use "zcu102-zynqmp" HDFplatform from GitHub MACHINE_BASE = "${@'-'.join(MACHINE.rsplit('-')[-2:])}" do_deploy_prepend() { if [ "${MACHINE_BASE}" != "${MACHINE}" ] && [ -d ${WORKDIR}/git/${MACHINE_BASE} ]; then ln -sf ${MACHINE_BASE} ${WORKDIR}/git/${MACHINE} fi } |
DSA Format
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Legacy Formats
example-zcu102-zynqmp.conf | local.conf
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HDF_EXT_pn-external-hdf = "dsa" | ||||||
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xdf" HDF_EXT_example-zcu102-zynqmp = "dsa" |
Related Links
Creating a Custom Xilinx Yocto Layer