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With the new Kconfig preprocessor (described in https://github.com/torvalds/linux/blob/master/Documentation/kbuild/ kconfig-macro-language.txt), the syntax for expanding environment variables is $(FOO) rather than $FOO. $(FOO) is a general preprocessor variable expansion, which falls back to environment variables if the variable isn't set (like in Make). It can also be used in prompts, 'comment's, etc. The old syntax will probably be supported forever in Kconfiglib for backwards compatibility, but might as well make it consistent now that people might start using the preprocessor more. Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no> |
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.. _lldp-sample: LLDP Sample Application ####################### Overview ******** The Link Layer Discovery Protocol sample application for Zephyr will enable LLDP support and setup VLANs if needed. The source code for this sample application can be found at: :file:`samples/net/lldp`. Requirements ************ - :ref:`networking_with_qemu` Building and Running ******************** A good way to run this sample LLDP application is inside QEMU, as described in :ref:`networking_with_qemu` or with embedded device like FRDM-K64F. Note that LLDP is only supported for boards that have an ethernet port. Follow these steps to build the LLDP sample application: .. zephyr-app-commands:: :zephyr-app: samples/net/lldp :board: <board to use> :conf: prj.conf :goals: build :compact: Setting up Linux Host ===================== If you need VLAN support in your network, then the :file:`samples/net/vlan/vlan-setup-linux.sh` provides a script that can be executed on the Linux host. It creates two VLANs on the Linux host and creates routes to Zephyr.