Implement CI for 64-bit CVA6 #452
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This PR extends our CI system to also run tests on real CVA6 hardware, to ensure that we don't inadvertently break this platform. The CI infrastructure depends on a bitstream version that includes our changes to the bootrom (openhwgroup/cva6#2267), which implement a simple UART-based firmware flashing functionality.
As part of extending our CI to this platform, we spent some effort to make the system hostable and extensible by others. We check in some previously unofficial helper scripts that operate an FT245R relay board, enabling us to turn boards off and on remotely. We also include some infrastructure for discovering serial ports (since our runner machine has many of these).