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ADR-0001: Pinned upstream plus reviewable patch series

Status: accepted. Date: 2026-10-17; documented during handoff on 2026-10-18.

Context

Both Safe 3 revisions need the existing boot chain, HAL, protected norcow, Optiga, MicroPython and Rust two-button UI. Forking or copying the whole stack would hide security updates and duplicate large bodies of code.

Decision

Pin the unmodified upstream release core/v2.12.5 as a Git submodule. Keep integration changes as ordered git format-patch files in patches/series. Own application and native sources in the superproject and link them into the build via the patch series. Never record the locally patched commit as the superproject's upstream base merely because a build used it.

Consequences

Every upstream modification has an independently reviewable rationale and a reproducible base. Changes in upstream APIs, storage and linker layouts require both-model builds and renewed acceptance. The preparation helper checks out feuristic/patched inside the submodule; it is suitable for deliberately prepared build environments, not automatic execution under a no-branch-change policy. See patch maintenance.

Upstream components retain their licenses; the project code is GPL-3.0-only. The third-party firmware requires irreversible bootloader unlock and does not inherit manufacturer attestation or release signing. See installation and release policy.