arch-chroot -S /mnt
===== bootloader =====
mkinitcpio -p linux
bootctl install
default arch.conf
timeout 4
console-mode max
editor no
title Arch Linux
linux /vmlinuz-linux
initrd /initramfs-linux.img
options root=UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx rw
title Arch Linux (fallback initramfs)
linux /vmlinuz-linux
initrd /initramfs-linux-fallback.img
options root=UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx rw