ยง2023-09-29
- Prerequisites
- Computer running linux (gentoo)
- Option to access the SD-Card from this computer
- Option use USB drive.
- Partition Table
The desired partition tables looks like this:
| Area Name | Size | From (sector #) | To (sector #) | device |
|---|---|---|---|---|
| Bootloader1 / MBR | 512B | 0 | 0 | - |
| U-Boot | 959.5K | 1 | 1919 | /dev/block/bootloader |
| U-Boot Environment | 64KB | 1920 | 2047 | /dev/block/env |
| FAT32 for boot | 128MB | 2048 | 264191 | /dev/mmcblk0p1 |
| swap | 4GB | todo | todo | /dev/mmcblk0p2 |
| BTRFS root | - | todo | remaining blocks | /dev/mmcblk0p3 |
Option 1 - Extract from Image
In this section, the desired partition table is acquired by using an available ubuntu boot image. This has the advantage of not needing to build U-Boot.
Download an ubuntu image to extract the bootloader from.
user $wget http://de.eu.odroid.in/ubuntu_18.04lts/N2/ubuntu-18.04.2-4.9-minimal-odroid-n2-20190329.img.xz
Extract the image.
user $xz -d ubuntu-18.04.2-4.9-minimal-odroid-n2-20190329.img.xz
Copy the first MBs which contain the partition table and the bootloader to the sd-card.
user $dd if=ubuntu-18.04.2-4.9-minimal-odroid-n2-20190329.img of=/dev/mmcblk0 bs=1M count=150 status=progress
150+0 records in
150+0 records out
157286400 bytes (157 MB, 150 MiB) copied, 0,241063 s, 652 MB/s