OpenTitan Demos

This is a work-in-progress repository that helps building your own FPGA demonstrators and apps.

At the moment it uses the entire OpenTitan tree to build a modified bitstream for the Nexys Video board. The modification is an extra SPI device that is mapped to the JA pmod.

In future the idea is to support multiple FPGA boards and SoC layouts, but there is some work pending on OpenTitan itself to better support that.

For now, the main purpose is to build software for OpenTitan out-of-tree. It is very simple to create own applications and execute them.

QuickStart

Clone OpenTitan:

git submodule update --init --recursive

You need to prepare the Python environment:

pip3 install -r python-requirements.txt
pip3 install -r opentitan/python-requirements.txt

You will need Vivado and the RISC-V toolchain as described in the OpenTitan documentation.

Prepare OpenTitan bitstream and libraries:

doit prepare_opentitan_sw
doit prepare_opentitan_bitstream

Now load the bitstream to the FPGA:

doit program_bitstream

Finally build the software from this repository:

doit build_device_sw

And now flash it to the device (set app as you like):

doit flash_device_sw hello