faster boot (5s from grub removed)
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
-GRUB_TIMEOUT=5
+GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200 earlyprintk=ttyS0,115200 consoleblank=0"
