Address and interrupt policies trade flexibility with software stability.
+------------------+----------------+----------------+----------------+
| Approach | Strength | Weakness | Best when |
+------------------+----------------+----------------+----------------+
| Strict | predictable | slower early | new program |
| Balanced | practical | needs rigor | stable teams |
| Aggressive | fast | escape risk | late schedule |
| Re-architect | durable | expensive | recurring failures |
+------------------+----------------+----------------+----------------+Pick the approach based on residual silicon risk, not only schedule pressure.
Policy-only arguments without artifact evidence
Unbounded waivers
INTEGRATION EVIDENCE MATRIX — I/O Subsystem Integration
+-------------------+------------------------+--------------------------+-------------------------+
| Evidence | Tells you | Does not prove | Next action |
+-------------------+------------------------+--------------------------+-------------------------+
| Manifest diff | baseline changed | root cause itself | isolate first delta |
| Domain trace | where behavior diverged| ownership accountability | map to contract owner |
| Signoff dashboard | closure posture | reproducibility quality | verify source artifacts |
| Bring-up logs | software-visible symptom| physical/timing cause | correlate with HW trace |
| Waiver register | accepted residual risk | technical closure | review expiry criteria |
+-------------------+------------------------+--------------------------+-------------------------+Address, interrupt, and IO contracts are where hardware/software alignment is won or lost.
HW/SW CONTRACT
address map + interrupt model + io defaults -> firmware behaviorBOOT REGRESSION SOURCES
map churn █████
reset defaults ████
driver mismatch ███address decode audit
interrupt latency report
IO bring-up checklist
boot contract review
A map alias issue caused sporadic peripheral misconfiguration despite clean block-level tests.
Freeze address map baseline
Audit reset defaults
Validate firmware assumptions
Ask: what baseline, owner, and artifact prove this topic is truly closed?
State baseline manifest and owner with every closure metric.
Run cross-domain regression after every top-level fix.
Comparing results across different manifests.
Unowned issues slipping through review cycles.
Waiving risks without expiry and validation plan.
I/O integration couples pinmux, clocks, resets, DMA, and register semantics; mismatched assumptions usually surface as bring-up instability.
Metric: I/O bring-up pass rate, register-map mismatch defects
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