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Julien Calixte 0b52f34940 docs(postmortems): record Spike 3 SD CMD59 card incompatibility

New docs/postmortems/ folder. The bench card (133 GB SDXC) rejects CMD59
(SPI-mode CRC) as illegal; CMD0/CMD8 succeed, so wiring and firmware are
proven and the fix is a compliant card. Captures the root cause, the
keep-CRC-required decision, and the reusable findings (EPD bus lock, LFN
requirement, R1-byte diagnostic) before the work pauses for hardware.

2026-07-05 18:16:49 +02:00

2026-07-05-spike3-sd-cmd59.md

docs(postmortems): record Spike 3 SD CMD59 card incompatibility

2026-07-05 18:16:49 +02:00

README.md

docs(postmortems): record Spike 3 SD CMD59 card incompatibility

2026-07-05 18:16:49 +02:00

README.md

Postmortems

Bench + bring-up debugging write-ups: what broke, how we found the root cause, and the decisions that came out of it. One file per incident, named YYYY-MM-DD-<slug>.md. These capture why a spike stalled or a design turned — the kind of context that's expensive to reconstruct later.

Project overview: ../../README.md. Bring-up spikes: ../v0.1-mvp-technical.md.

Date	Incident	Status
2026-07-05	Spike 3 (SD) — card rejects CMD59 (SPI-mode CRC)	Paused — awaiting a compliant microSD; wiring + firmware proven