MMC over SPI: read wait - #65
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dron0gus merged 1 commit intoJan 5, 2026
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Some SD cards need significant time for initialization. Seems initialization happens on first read.
dron0gus
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🤖 chibios-sheriff — backport (advisory) Backport of **rusefi#59** (main commit `0d1d4d0`) to `stable-21.11.x`. **Fixes** (defensive guards in `drvromfs_impl.inc`) - `romfs_chunked_read`: early return at EOF / zero-length; reject a misbehaving chunk backend (`copied == 0` → would spin; `copied > chunk_available` → would overrun). - `__romfile_setpos_impl`: validate `SEEK_CUR`/`SEEK_END` bounds before the signed `vfs_offset_t` addition. **Adaptation:** none — cherry-pick applied cleanly. **Local gates** (stable has no CI, and stable currently has no in-tree VFS/ROMFS *consumer* to link-build — the driver was backported as source in rusefi#32): `drvromfs.c` `-fsyntax-only` compiles clean against the stable F302 header set; `stylecheck.py` clean. The change is byte-identical in effect to rusefi#59 on `main`, which passed full CI (it compiles `drvromfs.c` via the SB_HOST_SWITCHED demo there). **Changelog:** none — VFS/ROMFS debuts on stable in the pending 21.11.6 (via rusefi#32), so this is pre-release refinement of an unreleased subsystem (same call as rusefi#59 on main). Sheriff-authored backport — a human reviews/merges. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Some SD cards need significant time for initialization. Seems initialization happens on first read.