# DF-2101 — amphy DSCSR_10FDX sets IFM_HDX instead of IFM_FDX

## Verdict
REPRODUCED (source-only confirmation). Bug confirmed by source tracing.

## Mechanism
amphy.c:268-269: DSCSR_10FDX (10Mbps full duplex) branch sets IFM_10_T|IFM_HDX (half-duplex) instead of IFM_FDX. The 100FDX case at line 264-265 correctly uses IFM_FDX. Duplex is misreported for 10FDX links.

## Fix
Change IFM_HDX to IFM_FDX at line 269.

## Batch-build status
Applied with all 24 other fixes; kernel + modules compiled **rc=0, 0 errors, -Werror**.