This part assumes you have partitioned your drive in a way that is satisfactory for both you and your computer.

If you are using root on Root on ZFS, chances are you have already formatted your partitions.

Likewise, if you are using Disk encryption, that will influence what you do here.

Root filesystem

The filesystem you choose for the root partition is usually up to you. The typical most common choice of root filesystem is Ext4 or XFS. Chimera does not mandate anything specific.

An example, assuming /dev/sda2 is your root partition:

# mkfs.ext4 /dev/sda2

When installing on SD cards, you might want to disable the journal. You can do it by passing the option -O ^has_journal after mkfs.ext4.

Raspberry Pi

Since Raspberry Pi systems often rely on MBR, which does not support partition labels, the default cmdline uses a filesystem label as root. Therefore, you might want to ensure that your root filesystem is labeled root. Alternatively, you can edit /boot/cmdline.txt after installation to reflect your desired configuration.

Boot filesystem

A common case for this is if your root filesystem is not supported by your bootloader, assuming it needs to be. Ext4 is a frequent choice as well, some people use Ext2 and others. For systemd-boot, it usually needs to be FAT32 (and its type must be Linux extended boot).

EFI System Partition

The ESP always uses the FAT32 filesystem. Assuming it is /dev/sda1, you can format it like this:

# mkfs.vfat /dev/sda1

PowerPC PReP Boot

POWER systems using this partition do not put any filesystem on it. It is, however, very important for bootloader installation that it is empty.

Assuming it’s /dev/sda1, you should erase it:

# dd if=/dev/zero of=/dev/sda1

Apple_Bootstrap partition

On Power Macs using the bootstrap partition, there needs to be a legacy HFS created in zeroed space. Given a /dev/sda2 bootstrap partition, do the following:

# dd if=/dev/zero of=/dev/sda2
# hformat -l bootstrap /dev/sda2

If you don’t have hformat, at least on Chimera it’s present in the hfsutils package, which can be installed like so:

# apk add hfsutils


Let’s assume you have a swap partition at /dev/sda3. You will want to create your swap space on it like this:

# mkswap /dev/sda3

Other partitions

This is usually up to you.