Hello Zbigniew,

  ZB> Tried both ways - same result.

How many channels does your HPT370 provide?

  ZB> No. It does look strange, because it's booting from my
    > main drive. But at the boot stage NetBSD reports main
    > drive as "wd1", instead of "wd0", as usual.

Ah, I had misunderstood the nature of the problem then.  The
unusual nature of your configuration sounds like a good
reason to define those device names in your custom kernel.

  ZB> I'm afraid of messing a filesystem - it has different
    > CHS translations on the slow, and on the fast
    > controller.

You do have the data from your main drive backed up?

- Andy Ball