i have hdinstool on floppy (the soft which comes with the alfapower) and i see the CF on my A500, i've quited witout saving.
here is a picture:
http://hpics.li/ed4133c
i will see the log in winuae now.
EDIT:
test made with winuae 3.1.0, if the hardrive is set to IDE the CF doesn't boot, here is the winuae log
winuaebootlog.txt