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fix: /boot rsync missing due to -x flag, and idbloader dd offset wrong (skip=64)

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BarnacleBoy 2026-06-02 21:50:13 +00:00
parent d4dd137a9a
commit f87dcdb54a
1 changed files with 6 additions and 3 deletions
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9
docs/emmc-multiboot.md
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@ -114,10 +114,12 @@ sudo mkdir -p /mnt/root_opios/boot
sudo mount /dev/mmcblk0p1 /mnt/root_opios/boot
sudo rsync -axHAWX --info=progress2 / /mnt/root_opios/
sudo rsync -aHAWX /boot/ /mnt/root_opios/boot/ # /boot is a separate partition, -x skips it
```
Flags: archive, stay-on-filesystem (critical — skips /proc, /sys, /dev), preserve
hardlinks/ACLs/xattrs, copy whole files (faster locally).
hardlinks/ACLs/xattrs, copy whole files (faster locally). The second rsync handles the
separate /boot partition that -x deliberately avoids.
### 1.6 — Bind mount virtual filesystems
@ -171,10 +173,11 @@ First check if Orange Pi OS ships u-boot binaries:
find / -name "idbloader.img" -o -name "u-boot.itb" -o -name "*loader*" 2>/dev/null
```
If files exist at known paths, use them. If not, extract from SD card:
If files exist at known paths, use them. If not, extract from SD card. The idbloader
starts at sector 64 of the SD card (sectors 0-33 hold the GPT), so skip there:
```bash
sudo dd if=/dev/mmcblk1 of=idbloader.img bs=512 count=16384
sudo dd if=/dev/mmcblk1 of=idbloader.img bs=512 skip=64 count=16320
sudo dd if=/dev/mmcblk1 of=u-boot.itb bs=512 skip=16384 count=8192
```