From owner-freebsd-current  Sun Aug 27 00:22:27 1995
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From: Morgan Davis <root@io.cts.com>
Message-Id: <199508270722.AAA00144@io.cts.com>
Subject: wd0 detect fails
To: current@freebsd.org
Date: Sun, 27 Aug 1995 00:22:20 -0700 (PDT)
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I put a 2MB caching Promise IDE controller into my 486 and moved the
drives off the onboard IDE controller that this motherboard supports.
I disabled the BIOS settings for the onboard IDE, then restarted.

Under a current kernel built just two days ago, it fails to find wdc0
at 0x1f0, can't mount /root, and panics.

If I go back to my previous kernel built August 8, it can find it just
fine (which is what I'm using now) and 0x1f0-0x1f7 irq 14.

So something has changed in the probing at startup that is causing it
to miss the drives hanging off this older caching controller.