sDDF

seL4 Device Driver Framework

The sDDF aims to provide interfaces and protocols for writing and porting device drivers to run as seL4 user level programs. It currently supports a network device running on iMX8 hardware, reaching near wire speed. It has been built on top of seL4 Core Platform and requires this pull request. The seL4 Core Platform binaries can be built separately and handed to the echo_server makefile.

Building the sDDF

Note that while any ARM GCC toolchain should work, all testing and benchmarking so far has been done with the ARM GCC toolchain version 10.2-2020.11.

If you wish to use the default toolchain you can download it from here: https://developer.arm.com/-/media/Files/downloads/gnu-a/10.2-2020.11/binrel/gcc-arm-10.2-2020.11-x86_64-aarch64-none-elf.tar.xz?revision=79f65c42-1a1b-43f2-acb7-a795c8427085&hash=61BBFB526E785D234C5D8718D9BA8E61.

Otherwise, you can change the Makefile to accept another toolchain or pass the prefix to the Makefile using the argument TOOLCHAIN=<PREFIX>.

    $ cd echo_server
    $ make BUILD_DIR=<path/to/build> \
        MICROKIT_SDK=<path/to/core/platform/sdk> \
        MICROKIT_BOARD=imx8mm_evk MICROKIT_CONFIG=(benchmark/release/debug)

Benchmarking

In order to run the benchmarks, set MICROKIT_CONFIG=benchmark. The system has been designed to interact with ipbench to take measurements.

Checks to make before benchmarking:

• Turn off all debug prints.
• Turn off all sDDF related asserts (pass NO_ASSERT in Makefile).
• Run with LWIP asserts turned off as well (LWIP_NOASSERT).
• Make sure compiler optimisations are enabled.

Supported Boards

iMX8MM-EVK