Grub fails after install it on my macbook pro

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http://unix.stackexchange.com – I'm trying to install Archlinux on my macbook in dual boot mode. I part the disk that way : /dev/sda1 -> EFI /dev/sda2 ->MacOS /dev/sda3 -> /boot /dev/sda4 -> / /dev/sda5 -> /home As i read in the docs i don't install grub on my MBR, i put it in sda3 - the boot partition. I did it with a Ubuntu Live Cd and the command : sudo grub-install --boot-directory=/media/boot_partition /dev/sda3 --force When i reboot my mac i can choose the Linux partition with rEFIT. But it only show the GRUB minimal bash... grub> I tried to fix it up, but nothing really works. (HowTos)