root vs real_root - A real_root használja az initramfs-t az eszközök inicializálásához

title Gentoo Linux
root (hd0,1)
kernel /boot/kernel-genkernel-x86-2.6.24-gentoo-r5 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/mapper/nvidia_abiccada4 dodmraid video=vesafb:ywrap,pmipal,1280x1024-16@60
initrd /boot/initramfs-genkernel-x86-2.6.24-gentoo-r5

http://askubuntu.com/questions/197833/recovering-from-grub-rescue-crash

ls (hdX,Y)  #replace X,Y with the right numbers, eg (hd0,3) for 3rd partition, 1st drive or (hd1,5) for 2nd drive, fifth partition
set prefix=(hdX,Y)/boot/grub
set root=(hdX,Y)
set
ls /boot  
insmod linux
linux /vmlinuz root=/dev/sdXY ro  #use the usual linux way of referring to partitions: sda1 would 1st drive, first partition; sda3: 1st drive, 3rd partition; sdb5: 2nd drive, 5th partition
initrd /initrd.img
boot

Csak konzolos grub config:

/etc/default/grub

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'
 
GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="text"
 
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
 
# Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL=console
 
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
 
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
GRUB_DISABLE_LINUX_UUID=true
 
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
 
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"