Partition layout

[jonius]

Afaik the partition layout on UT phones varies from phone to phone. We need to clarify, which partitions do we need or should have on the Raspberry Ubuntu Touch?

[Flohack]

@jonius said in Partition layout:

varies from phone to phone. We need to clarify, which partitions do we need or should have on the Raspberry Ubuntu Touch?

You only need a data partition that is recognized and mounted on startup. Inside, a folder named data will be searched, and there will be system.img and ubuntu.img IMHO. So you dont need a complex partition layout at all

[Flohack]

Means: All mounts in UT are bind-mounts and mounts of disk images.

[jonius]

@flohack additionally to the root partition, running the kernel? So we would have two partitions, an ubuntu root / and a /mnt/data? What are system.img and ubuntu.img for? Where does the read-only UT rootfs live (one /?) and where the writable home?

[Flohack]

@jonius Ok let me explain with a screenshot - this one is from the old boot layout, where android system is inside ubuntu.img and system.img is a hardlink to ubuntu.img, so please forgive the sizes of the files. This WILL change with Halium):
partition BOOT: Contains initrd system with kernel and the usual initrd helpers

partition DATA: ext4 formatted, contains:
on /data:

• ubuntu.img is the read-only root filesystem
• system.img contains the Android LXC container. This will not be needed at all for Raspberry
• folder user-data: Contains all user data from the home dir
• folder system-data:Contains system settings like WiFi, network, future printing, etc.

So, if you manage to boot the raspberry image, your bootloader basically needs to follow the steps of https://github.com/ubports/ubports-boot and its initrd workflow. Specifically, see this init: https://github.com/ubports/ubports-boot/blob/master/initramfs/init

BR