Old kernel development methods did not work any more ?

Hi

... current changed for me ...

People, anybody known why 'call doadump' in DDB does not work any more
on 8-CURRENT ?

It just shows first number and then debugger prompt again, with no
explanation what is wrong ?

dump device was assigned before with dumpon /dev/ad0s2b 
(swap partition, exactly RAM size)

And another problem: simple sequence on loader prompt

unload
set kernel=kernel.old
boot 

does not works any more for me, it loads kernel.old/ kernel and modules,
and then show strange diagnostic about 0xffffffff (kernel even not
started)
/do not remember exact words, may provide if need/

hints will be very appreciated 

-- 
Vladimir B. Grebenschikov
vova_at_fbsd.ru