GRUB and boot partition

[microsoft gaofei]

https://wiki.archlinux.org/index.php/GRUB#Boot_partition      . ArchWiki has 
carried an introduction of GRUB , it offers a feature to decrypt your 
partitions and you don't need to separate /boot . Debian also uses GRUB as its 
boot loader ,but Debian still separates /boot partition and leave it unencrypted