Add UBI-aware NAND writes for install and restore#62
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Raw UBI images written via `nand write` corrupt UBIFS because bad block skipping shifts data, breaking UBI's physical-to-logical block mapping. This adds a UBI image parser (`defib.ubi`) that extracts UBIFS volume data from raw UBI images (UBI# magic), then writes via `ubi part` / `ubi create` / `ubi write` which lets U-Boot's UBI subsystem handle bad block mapping. Changes: - New `src/defib/ubi.py`: parse UBI EC/VID headers, extract UBIFS by volume ID - `defib install --nand`: detect raw UBI rootfs, extract UBIFS, write via `ubi write` instead of `nand write`; detect download command mode (XHEAD/XCMD) so install works on chips with CONFIG_START_MAGIC (e.g. hi3516av200); page-align NAND write sizes to 2KB - `defib restore`: auto-detect raw UBI images in partition files and convert to UBIFS before UBI-aware write; create UBI volumes with full partition space (not just image size) so UBIFS has room for runtime writes - 8 new tests for UBI extraction Tested on hi3516av200 (128MB SPI NAND, MX35LF1GE4AB): - UBI attaches cleanly: 944 PEBs, 0 bad, 0 corrupted - UBIFS mounts without errors: 111 MiB usable (vs 10 MiB before) - Linux boots fully, services start, no "space left" errors Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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Summary
rootfs.ubi) written vianand writecorrupt UBIFS because bad block skipping shifts data, breaking UBI's physical-to-logical block mappingdefib.ubimodule extracts UBIFS volume data from raw UBI images, then writes viaubi part/ubi create/ubi writewhich handles bad blocks correctlydefib install --nandnow detects download command mode (XHEAD/XCMD) for chips with CONFIG_START_MAGIC (hi3516av200), page-aligns NAND writes, and uses UBI-aware rootfs writesdefib restoreauto-converts raw UBI images to UBIFS and creates UBI volumes with full partition space (not just image size)Test plan
Before (raw
nand write):After (
ubi write):🤖 Generated with Claude Code