I try this to make My xpenology "DS214play" with DSM 5.0-4482 booting itself without usbflash or cddrive. A note here, i use 1 hd, so parameter missing needed. First you need is PartedMagic or other rescue Distro.
1. Boot to PartedMagic
2. Installing Bootloader "dd if=/usr/share/syslinux/mbr.bin of=/dev/sda"
3. Build RAID "mdadm --build /dev/md0 --level=1 --raid-devices=2 /dev/sda1 missing"
4. Mount it "mount -t ext4 /dev/md0 /mnt/local"
5. Install Extlinux "extlinux --install /mnt/local"
6. Make /dev/sda1 bootable with ""fdisk" or "cfdisk"
7. Make file "extlinux.conf" at root folder (/mnt/local) =
PROMPT 1
TIMEOUT 20
DEFAULT nanoboot
LABEL nanoboot
KERNEL zImage ihd_num=0 netif_num=4 sn=B3J4N01003 vid=0x0EA0 pid=0x2168 loglevel=0 vga=0x305
8. Extract zImage from NanoBoot and copy to /mnt/local
9. At last reboot.
Sorry about my English...