Move from percent to explicit size and set a default of 256M (sparse)

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>

Lukas Fleischer authored 10 years ago and Gerardo Pozzi committed 10 years ago

Among other things, 36459f3a ([archiso] Drop aitab support, 2014-06-28)
removed the possibility to manually set a specific architecture by using
kernel parameters. This, however, is useful, e.g. when installing Arch
Linux on a device that reports itself as i586 but works fine with the
i686 flavor.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

Always create one filesystem of a fixed size (32G), format (ext4) and
know name "airootfs".

Simplify logic a lot.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>