[Bug 209210] IXP700 AHCI controller times out when MSI enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209210

            Bug ID: 209210
           Summary: IXP700 AHCI controller times out when MSI enabled
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bitbucket63-it at yahoo.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Overview

Motherboard Elite Group A740GM-M v7.0 with IXP700 AHCI controller will time out
attempting to query SATA drives in any BIOS configuration while installing
10.3-STABLE. Disabling MSI on the ahci driver via the loader "set
hint.ahci.X.msi=0" where X is the ahci bus number, will allow normal detection
and access to the SATA disks.

Steps to reproduce

Attempt to install FreeBSD 10.3-STABLE onto a A740GM-M v7.0 motherboard with
SATA disk(s).

Atual results

Boot messages show many timeouts on the ahci bus while querying the disks.
During installation and use of the live file system, no SATA devices are
available.

Expected results

Booting into the installation should detect SATA disks as normal. The ahci
driver should detect the IXP700 chipset as being unable to use MSI and disable
it.

Build date and hardware

FreeBSD 10.3-RELEASE 2016-03-25 usb stick image on amd64

Additional information

I believe this is also the case with any version of FreeBSD since 8.4-STABLE.

The workaround is to set hint.ahci.0.msi=0 at the loader prompt prior to
booting the installation disk.

PR 174985 seems to be related to this issue.

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