Laan Tungir ac2e6347a2 v0.1.6 - Teensy 4.1 SD-card OTP pad: real implementation working on hardware ...

- otppad_embedded: bit-compatible port of libotppad (2386/2386 host tests pass)
- otp_pad_sd: SdFat-direct SD card pad reader (FAT-only, ASCII armor + binary .otp)
- pad_gen.ino: TRNG-sourced 1 MB pad generator using i.MX RT1062 TRNG registers
- Linker script: moved .rodata from DTCM to FLASH (EXCLUDE_FILE ed25519),
  reclaiming 124 KB DTCM, free stack 5.9 KB -> 130.9 KB
- check_stack.sh: build-time FlexRAM stack gauge, wired into build_signer.sh
- test_otp_sd.py: 8/9 hardware tests pass (ASCII + binary round-trips,
  offset advance, tamper detection; 10 KB plaintext times out on perf)
- test_classical.py: 16/16 pass with new memory layout (ed25519 OK)
- Memory evaluation document: plans/teensy41_memory_evaluation.md

2026-07-30 17:10:50 -04:00

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