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osmo-rfds/doc/build.md

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Building Image

Building the image is pretty well documented on ADI's wiki about the pluto :

So this document will only describe the broad lines and deviations from the process described in those links.

Environment

Xilinx Vivado 2017.4.1 is required to build the image. We will also use the Vivado hardfloat toolchain rather than the default one (documentation for this can be found in the README.md of the plutosdr-fw repository).

Required environment variables :

export CROSS_COMPILE=arm-linux-gnueabihf-
export PATH=$PATH:/opt/Xilinx/SDK/2017.4/gnu/aarch32/lin/gcc-arm-linux-gnueabi/bin/
export VIVADO_SETTINGS=/opt/Xilinx/Vivado/2017.4/settings64.sh

DO NOT source the vivado settings ( settings64.sh ) directly into your shell. This will break the build ! The build process will use the environment variable VIVADO_SETTINGS to manually setup the required envirtonment whenever it's needed.

The build process also needs X running (because Xilinx's SDK needs X). But no interaction is needed, so running Xvfb in the background and manually setting up DISPLAY works fine to build on headless servers.

Xvfb &
export DISPLAY=:0

Prepare Sources

First step is to clone them from ADI :

git clone --recursive https://github.com/analogdevicesinc/plutosdr-fw.git
cd plutosdr-fw

Then apply the patches in this repository to the appropriate submodules :

  • patch-hdl-add-signal-delay-datapath.diff : This is the main patch add custom logic in the datapath of the FPGA
  • patch-buildroot-vivado-crosscompiler.diff: This updates the buildroot configuration to be compatible with the arm-linux-gnueabihf toolchain.
  • patch-buildroot-use-ecm-instead-of-rndis.diff : This replaces the propriatary RNDIS mode with the standard CDC ECM mode for network gadget.
  • patch-buildroot-add-ssh-key-example.diff : Example patch to add SSH key directly into the image for easy access

Finally you can copy the latest version of the sig_combine.v and sig_delay.v files from this repository (in gw/) to plutosdr-fw/hdl/library/common/.

Build

If everything above went well, just type make in the plutosdr-fw directory and it will build everything ...

Building Control Software

To build the control software, you need the 'SDK' / 'SYSROOT' that will be built as part of building the image above. It can be found under plutosdr-fw/buildroot/output/host/arm-buildroot-linux-gnueabihf/sysroot/.

Then in the sw directory of this repository, simply type make while specifying the sysroot to use:

make SYSROOT=xxx/plutosdr-fw/buildroot/output/host/arm-buildroot-linux-gnueabihf/sysroot/

This should result in a osmo-rfds binary.

To include it directly on the image, you can copy it to plutosdr-fw/buildroot/output/target/usr/sbin/ and run the make in plutosdr-fw again to update the image.