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BlackMark 3990f53180 pureboot: take the running slot from avr::startup::caller_page

The write guard's anchor was costing a materialised pointer and a byte swap to
use one byte of it. The libavr primitive answers it in a single load, which is
eight bytes off every build — and what lets the USART release fit the tightest
configuration in the space: the 1284 autobaud on USART-shared pins was 514 of
its 512 and is now 506, with the default pinning down from 510 to 502.

Verified on silicon: the guard still refuses an erase aimed at the slot it runs
from, and still permits one in the application region.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-24 17:57:47 +02:00

oracle

tsb: third size pass — restructure to the oracle's shape

2026-07-20 01:00:27 +02:00

pureboot

pureboot: take the running slot from avr::startup::caller_page

2026-07-24 17:57:47 +02:00

test

pureboot 5: one command pair for every memory, and a clock-free backend

2026-07-24 15:50:48 +02:00

tools

test: the exhaustive clock x baud x backend size matrix