probe ordering of interfaces

From: Barry Bouwsma (freebsd-misuser_at_remove-NOSPAM-to-reply.NOSPAM.dyndns.dk)
Date: 08/29/04

  • Next message: calebsbc: "Install problem" 
    Date: Sun, 29 Aug 2004 16:08:57 +0200 (CEST)
To: freebsd-hackers@freebsd.org

    [please drop me from replies and keep it on the list]

    A stupid question, which probably has been covered in the archives
    somewhere where I'm not looking.

    What determines the probe/attach ordering during boot?

    Specifically, I want to swap attach order of two devices
    that end up as umass, and wiring the device will not give
    the desired result.

    More specifically, I want to have firewire (sbp) devices
    hung onto da* first, and then USB umass devices.

    Even more specifically, I have a drive that I either attach
    via firewire on one machine, or via USB on a different box.
    I wish this drive to always be da0. I can connect it to a
    suitably ordered uhub slot in order to guarantee all other
    USB devices get da1-whatever. However, it seems that umass
    devices get attached to da* before firewire.

    As a result, when this drive is attached via firewire to a
    machine that has cardreaders and whatnot attached via USB,
    some other device shows as da0.

    If I were to wire sbp0 to be da0 on that machine, then if
    I were to attach it there via USB1/2, it would never be da0
    and my fstab would not match. Therefore, the solution seems
    to be to give firewire first dibs at da*, where nowadays umass
    gets first pick.

    thanks for the enlightenment
    barry bouwsma

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