BlackMark c8ac61779e tool: survive our own leftovers — drain the fresh port, shorten the identity read ...

--stay leaves the loader's final prompt in the USB pipeline; a fresh
invocation on a board that resets when its port opens then flushes too
early, trusts the stale prompt, and spends the new activation window on
a 2-second identity read against a device that never heard its knock —
collecting the application's banner as an unknown signature. Three
host-side moves, no device bytes: the line is drained until quiet
(bounded, 250 ms) before the port's first knock — once per port, since a
mid-session re-knock faces no foreign bytes and its own window is
already burning; the identity read_exact drops 2.0 to 0.5 s, dozens of
times the worst real answer, so any false prompt match leaves room for
the retry that already works; and the tool version drifts to 8. The
StaleDTRPort fixture models the whole moment — stale prompt in transit,
reset holding the device off the line, a finite window, the banner —
red against the old tool in exactly the field shape (unknown signature
from banner bytes), green now; LoaderPort answers its prompt to the
knock rather than to a read count, which the drain exposed as a
call-order coupling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-30 16:05:16 +02:00

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