The Blackarmor 400 is a 4 Slot NAS. I plan to get openwrt boot on it. I got
serial access to the bootloader using a serial adapter
and plan to load the kernel via tftp.

This is a rough info page of the current state:

• arcNumber (used by the linux kernel to identify the board)
  • 2678

further readings:

• Misc notes on the Seagate Blackarmor NAS, V1.15
• Thread in the OpenWRT Forum
• Kirkwood Specs