hesela.devError syndrome
An error syndrome is the result of applying a linear code's parity-check equations to a received word.
With parity-check matrix H and received word r, the syndrome is H r^T over the code's field. Zero indicates code membership, not identity with the originally stored word; different error patterns can share a syndrome. [1]
Linux v6.12 bch_decode can accept precomputed syndromes and returns located-error counts or error codes. It does not correct the input buffer itself. Located errors may be in payload or ECC: only locations below 8 * len select payload bits to flip. A returned count is not an unconditional physical error count relative to the original word. [2]
Relations
Citations
- H. C. A. van Tilborg: Coding Theory, a First Course, sections 2.1-2.2 and 4.2
- Linux v6.12 lib/bch.c: bch_decode return values, caller correction and syndrome processing