Some furthe investigation needed in:
# depmod -ae -F /boot/System.map-2.6.22-grml 2.6.22-grml
WARNING: /lib/modules/2.6.22-grml/extra/et131x.ko needs unknown symbol
vlan_group_set_device
WARNING: /lib/modules/2.6.22-grml/extra/et131x.ko needs unknown symbol
malloc_sizes
WARNING: /lib/modules/2.6.22-grml/misc/r1000.ko needs unknown symbol
pci_module_init |