Implement simple uart-based updater for the bootrom #2267
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@Gchauvon This feature seems interesting to reload 32 or 64bits Linux image on SDCard and boot it. Can you review the PR ? |
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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).
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In Keystone (https://github.com/keystone-enclave/keystone), we'd like to be able to run automated CI tests for all of our platforms to make sure that code changes don't break things, as much as possible. One difficulty is that many boards don't support updating firmware remotely. For CVA6 specifically, the firmware update process involves removing the microSD card, flashing a new image, and inserting it again. This does not work well for our remote tests.
This PR implements a simple UART-based updater in the bootrom. By hitting a key during boot, a user can then transfer an image of a specific size directly to memory and boot it. We plan to transfer a uboot image with TFTP capabilities, allowing us to then quickly flash the much bigger OS image as well.