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docs: Ch441 board validation + Ch437 A/B scanout evidence

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Preserve the Ch441 timing/renderer board-validation evidence and the
Codex-directed follow-up:
- FB reconciliation: the Ch437 A/B dump's 8-word first-beat delta was a
  non-reproducible one-time transient; 3x render+dump and 8x pure-probe
  re-reads all return golden d0047677 (words 0-7 correct). Memory integrity
  confirmed deterministic. (fb_reconciliation.md)
- Structural audit + A-D diagnostic proposal for LPDDR_STATUS[5]: bit5 ORs
  sticky CDC-synced underflow with AXI read-errors; dump path (arid=1) is
  separate from scanout/HDMI (arid=3). Instrumentation proposal only, not
  implemented. (scanout_status_bit5_proposal.md)
- Raw board logs, status samples, RBF hashes, A/B FB dump, board PNG.

No RTL edits, no compile, no builds.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
thejayman77
2026-07-21 20:34:20 -04:00
parent 96d23ea8ee
commit 2123e646c8
14 changed files with 316826 additions and 0 deletions
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docs/hardware/ch441_board_validation/redump_triage_console.log
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=== render+dump A ===
[sched] epoch 309: zero fragment drops (snap=0, sticky=0)
[sched] epoch 310: zero fragment drops (snap=0, sticky=0)
[sched] dump-fb: wrote 307200 words -> ch437_redump_A.mem sum32=0xaad0b94d xor32=0x33138181 nonzero=245155 bounds=(0,0)..(511,479) FB=640x480
[sched] DONE rc=0 (all gates passed)
d0047677371a0f6e4e319458926f604a8599c92baaf34d09b8e1fd452e31662b ch437_redump_A.mem
first16(A):
040c0c0b 030c0b0b 030a0909 030b0b0b 030d0b0b 040e0c0c 050f0e0e 050f0e0e 050b0a0a 050a0909 05090808 050a0a0a 050e0d0d 050d0d0c 050d0c0b 050d0b0b
=== render+dump B ===
[sched] epoch 309: zero fragment drops (snap=0, sticky=0)
[sched] epoch 310: zero fragment drops (snap=0, sticky=0)
[sched] dump-fb: wrote 307200 words -> ch437_redump_B.mem sum32=0xaad0b94d xor32=0x33138181 nonzero=245155 bounds=(0,0)..(511,479) FB=640x480
[sched] DONE rc=0 (all gates passed)
d0047677371a0f6e4e319458926f604a8599c92baaf34d09b8e1fd452e31662b ch437_redump_B.mem
first16(B):
040c0c0b 030c0b0b 030a0909 030b0b0b 030d0b0b 040e0c0c 050f0e0e 050f0e0e 050b0a0a 050a0909 05090808 050a0a0a 050e0d0d 050d0d0c 050d0c0b 050d0b0b
=== render+dump C ===
[sched] epoch 309: zero fragment drops (snap=0, sticky=0)
[sched] epoch 310: zero fragment drops (snap=0, sticky=0)
[sched] dump-fb: wrote 307200 words -> ch437_redump_C.mem sum32=0xaad0b94d xor32=0x33138181 nonzero=245155 bounds=(0,0)..(511,479) FB=640x480
[sched] DONE rc=0 (all gates passed)
d0047677371a0f6e4e319458926f604a8599c92baaf34d09b8e1fd452e31662b ch437_redump_C.mem
first16(C):
040c0c0b 030c0b0b 030a0909 030b0b0b 030d0b0b 040e0c0c 050f0e0e 050f0e0e 050b0a0a 050a0909 05090808 050a0a0a 050e0d0d 050d0d0c 050d0c0b 050d0b0b
=== pure-probe re-reads of words 0-15, 8 rounds, NO re-render (frame left by dump C) ===
round0: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round1: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round2: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round3: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round4: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round5: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round6: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
round7: 0x040C0C0B 0x030C0B0B 0x030A0909 0x030B0B0B 0x030D0B0B 0x040E0C0C 0x050F0E0E 0x050F0E0E 0x050B0A0A 0x050A0909 0x05090808 0x050A0A0A 0x050E0D0D 0x050D0D0C 0x050D0C0B 0x050D0B0B
=== triage done ===