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docs(deploy): bump dd count 2200 → 2800 for 25.11 image size

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The 24.05-era image was ~6 GB actual; the README's count=2200 (8.8 GB)
gave a small margin. The 25.11 image is 7.3 GB actual (linux-firmware-
zstd grew, plus the version churn) — count=2200 would now truncate.

Bump to count=2800 (~11.2 GB) and note that future bumps may need
another increase — image size is the right thing to check via
\`ls -lh result/\`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Padreug 2026-05-26 11:52:58 +02:00
commit 9bbe2a8aef
1 changed files with 4 additions and 3 deletions
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deploy/nixos/README.md
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@ -88,9 +88,10 @@ The bitSpire-flashed USB will show up as another disk (`sdb` or similar) — not
### 4. dd the bitSpire image to the eMMC ### 4. dd the bitSpire image to the eMMC
```sh ```sh
# Limit count to ~8.8 GB (the actual image size + small margin) to avoid # Limit count to ~11.2 GB (the actual image size + small margin) to avoid
# spending 30 minutes copying empty USB tail # spending 30 minutes copying empty USB tail. Bump this count if the
dd if=/dev/sdb of=/dev/mmcblk0 bs=4M count=2200 status=progress conv=fsync && sync # image grows further on future nixpkgs bumps — check `ls -lh result/`.
dd if=/dev/sdb of=/dev/mmcblk0 bs=4M count=2800 status=progress conv=fsync && sync
``` ```
### 5. Repair the GPT secondary header ### 5. Repair the GPT secondary header