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thejayman77 7d68577c75 Ch443f/Ch443e board validation evidence (compact)

Silicon closeout evidence for the Ch443f scanout CDC hardening (commits 064484c +
4110846). Text/hashes/verdict/samples only — RBFs and framebuffer .mem dumps left
uncommitted (preserved local / on board).

Ch443f board verdict: RBF 59c6372e, fit setup +0.068 / all classes clean, fpga0
operating, CORE_ID 0x50533200 ABI 0x100. 311-epoch f52 replay DONE rc=0 zero
drops, FB byte-identical golden d0047677. Scanout diagnostic 120 samples (60 @
50ms + 60 @ non-harmonic 7ms) all identical: 0x02C=0xD1 (scan-error clear),
0x120=0x18 (qualified valid=0 / underflow=0 / read-error=0 / live pmax=0). The
two phase-sweep logs are byte-identical -> no phase-dependent CDC artifact. The
former residual "underflow" was purely the raw-readiness CDC/sync transient; the
Ch443e 4-buffer/lead-2 already fixed the real lookahead starvation. No fifth
buffer justified.

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

2026-07-24 20:11:11 -04:00

1.9 KiB

Raw Blame History

Ch443f board validation

Date: 2026-07-24

Candidate:

Git commit: 4110846 (Ch443f timing: preload Z-RMW eviction awaddr at fill)
RBF: retroDE_ps2.ch443f.4110846.core.rbf
SHA-256: 59c6372e1cfeba62dccdce860f7ab365255ef32a77c3f7b13909b4c7cff16a87
Quartus: 26.1.0 Build 110, Seed 3

Fit acceptance:

Setup: +0.068 ns
Hold: 0.000 ns
Recovery: +1.080 ns
Removal: +0.003 ns
Minimum pulse width: +0.200 ns
RAM: 322 / 358
Zero violated paths

Board load:

Remote candidate hash matched the local artifact.
core_loader.sh reported Fabric loaded successfully.
fpga0 state: operating
CORE_ID: 0x50533200
ABI: 0x00000100
Board canonical /home/terasic/cores/retroDE_ps2.core.rbf was not modified and remained SHA-256 56e45346338907eb6c307320757774ac65efa56dabb644906a5600f5ea73a982.

Functional replay:

Complete 311-epoch sh3_zsrt139f52 replay finished DONE rc=0.
Every epoch passed texture CRC, drain, and zero-fragment-drop gates.
Framebuffer SHA-256: d0047677371a0f6e4e319458926f604a8599c92baaf34d09b8e1fd452e31662b.
The board framebuffer was byte-identical to the retained Ch443e/golden framebuffer.

Scanout diagnostic:

60 samples at 50 ms spacing plus 60 samples at non-harmonic 7 ms spacing.
All 120 observations were identical:
- 0x02C = 0x000000D1: scan-error bit 5 clear.
- 0x120 = 0x00000018: qualified valid=0, underflow=0, read-error=0, live pmax=0.
- 0x124 = 0x00408020: stale snapshot payload; ignored because valid=0.
No fifth line buffer is justified. The Ch443e four-buffer/lead-2 change fixed the real lookahead starvation; the remaining pre-Ch443f indication was caused by the raw readiness CDC / synchronization transient.

Disposition:

Ch443f is timing-clean, renderer-correct, and scanout-clean on silicon.
Board left running the Ch443f candidate.
Canonical artifact left untouched pending an explicit promotion instruction.

1.9 KiB Raw Blame History

Ch443f board validation

1.9 KiB

Raw Blame History