[Bug 200883] Installing FreeBSD 10.1-RELEASE-amd64-{disk1|dvd1}.iso fails to install on Dell C6220, bootonly.iso works

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200883

            Bug ID: 200883
           Summary: Installing FreeBSD 10.1-RELEASE-amd64-{disk1|dvd1}.iso
                    fails to install on Dell C6220, bootonly.iso works
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bcr at FreeBSD.org

I'm trying to install FreeBSD 10.1-RELEASE-amd64-{disk1|dvd1}.iso on a Dell
C6220 using their Java Webstart (Version 6) web-based management console. I
mount the ISO, boot the system from it and configure disk-space, select
distributions to install, etc. The installation starts and proceeds up to 50%
installed (according to the progess bar), then the Java-based viewer errors out
and disconnects the mounted ISO and monitor. 
When I reconnect, the installer can't continue due to missing media and the
installation is broken and needs to be restarted. I can reproduce the error,
each time it reaches only 50%. Right before reaching it, I see a drop of
transferred packets until it reaches zero, then it stays there and then the
error occurs.
Installing Ubuntu and other penguin OSes work fine being installed from ISOs as
described above.

I showed this behavior to sbruno@ in the BSDCan 2015 Hacker Lounge and we tried
the bootonly.iso together. This worked flawlessly and I can install a complete
FreeBSD system this way.  Sean experienced similar issues and suspects a
timeout in the CAM layer (CD-ROM/DVD emulation). He suggested to open this PR
so we can fix the issue, as he experienced similar issues with his C6220
systems.

Things I can do to narrow the problem down:
- Update the BIOS of the C6220 to the latest version from Dell
- Test a CURRENT-Snapshot
- Open a problem report with Dell
- test patches you sent me and provide feedback

I have 28 of those Dell C6220 under my control and would very much like to use
FreeBSD on them.

If you need more information, let me know.

Best regards

Benedict Reuschling

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