See also SheevaPlug
Support dropped for Guruplug and Sheevaplug.
After setting the basic system:
''echo 'CONFIG_TARGET_kirkwood=y' > .config“
you must configure the kernel with “make kernel_menuconfig”
From there, select the appropriate device from System Type → Marvell Kirkwood Implementations (Marvell GuruPlug Reference Board works for the GuruPlug Server Standard).