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util: FPGA runner: rework to use asyncio#398

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ziuziakowska wants to merge 2 commits intolowRISC:mainfrom
ziuziakowska:util-fixes-2
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util: FPGA runner: rework to use asyncio#398
ziuziakowska wants to merge 2 commits intolowRISC:mainfrom
ziuziakowska:util-fixes-2

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@ziuziakowska ziuziakowska commented Apr 3, 2026

Was #366 but that got auto-closed for some reason.
Split off from: #299

This reworks the FPGA runner to use asyncio to read from the UART while the flash is being written. This was causing some problems for me locally when adding some more debugging output, as in the time between finishing flashing and opening the UART file descriptor, the receive buffer would be overflowed and the test status would be dropped.

Signed-off-by: Alice Ziuziakowska <a.ziuziakowska@lowrisc.org>
@ziuziakowska ziuziakowska requested a review from engdoreis April 3, 2026 15:07
Signed-off-by: Alice Ziuziakowska <a.ziuziakowska@lowrisc.org>
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