How to use nomaster/noslave eide options?

It seemed very straightforward at the beginning… I thought if I add
“eide noslave” option to devb-eide command line it’ll find master device
only. After a couple of tests I found out that no matter whether I set
noslave or nomaster the devb-eide finds both hd0 and hd1 devices.

Can anybody tell me what I am missing? Is there a trick for using these