ipodpatcher -r bootpartition.bin N
it should be:ipodpatcher N -r bootpartition.bin
ipodpatcher -r 1 bootpartition.bin is much more likely to work than the former.
www.rockbox.org/twiki/bin/view/Main/IpodInstallation (http://www.rockbox.org/twiki/bin/view/Main/IpodInstallation) for full instructions.