[following up to myself]
My Sheevaplug now gets a lot further in booting (thanks matt@) but now
crashes when trying to load init.
This is booting over NFS using the mvgbe controller.
init path (default /sbin/init):
init: copying out path `/sbin/init' 11
Mutex error: mutex_vector_enter: locking against myself
lock address : 0x00000000c03d0100
current cpu : 0
current lwp : 0x00000000c2baca80
owner field : 0x00000000c2baca80 wait/spin: 0/0
panic: lock error
Stopped in pid 1.1 (init) at netbsd:cpu_Debugger+0x4: bx r14
db> bt
0xcc095cf4: netbsd:vpanic+0x10
0xcc095d0c: netbsd:snprintf
0xcc095d48: netbsd:lockdebug_abort+0x38
0xcc095d74: netbsd:mutex_enter+0x184
0xcc095de0: netbsd:pmap_enter+0x280
0xcc095e10: netbsd:uvm_fault_lower_enter+0x108
0xcc095f3c: netbsd:uvm_fault_internal+0xad4
0xcc095fac: netbsd:data_abort_handler+0x208
db>