Revert "Added check for serial input"
Revert "Added check for serial input"

This reverts commit 9d9ce54e141bd66458f808e6236b7d28fa70e6e2.

Reason: This commit broke the multiboot header

LFUnion/LFOS,LFUnion/LFOS,LFUnion/LFOS,LFUnion/LFOS