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Partition

The partition layout is a bit different on the first part. We prefere GPT every time where is possible. With SoCs they don't support GPT, we can use the hyprid GPT. More about this on development documentation.

The system is designed to have less as possible writes on the system. Which means we have basicly just writes on the OTA update and pretty small (5-6 times per week) on the overlay part. The Data partition have real I/O which is possible to offload into a different drive.

Basic it look like:

-------------------------
|       Bootloader      |
-------------------------
|       Kernel A        |
-------------------------
|       System A        |
|                       |
-------------------------
|       Kernel B        |
-------------------------
|       System B        |
|                       |
-------------------------
|       Bootstate       |
-------------------------
|       Overlay         |
|                       |
...

-------------------------
|       Data            |
|                       |
-------------------------

Sometime the bootloader part can look different because there can be firmware or SPLs for boot the CPU on the SoC.

Data

The data partation is the only partition with real I/O. It will be expanded automatic on boot time to the full size of the disk.

This partition can be offloaded to a different drive with the utility:

$ datactl move /dev/xxx

On next boot, the partition will be moved to the new drive. The drive need to be bigger as the old one and we own the full new drive.