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To: freebsd-current <freebsd-current@freebsd.org>
From: Julian Elischer <julian@freebsd.org>
Subject: mapping a device from device-id to /dev
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Date: Mon, 21 Aug 2017 19:51:39 +0800
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I have the following (Azure) device (disk) id:

dev.storvsc..%pnpinfo: classid=32412632-86cb-44a2-9b5c-50d1417354f5 deviceid=00000000-0001-8899-0000-000000000000

the question is:  "how can I map that do /dev/da1"..
I know that for my device it IS /dev/da1
but how can I prove it? there are so many mappings from one space to another I've totally lost track.
  there are acpi mappings, pnpmappngs, /dev/ mappings, PCI space mappings, things in sysctl, things in their own spaces, etc. etc.
In some architectures htere are fdt mappings and in some it's still pretty random from what I see.

Is there a document that covers all of these?