[Bug 230779] Broadcom 9480 (using SAS3516) requires newer mrsas and not mpr in kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230779

            Bug ID: 230779
           Summary: Broadcom 9480 (using SAS3516) requires newer mrsas and
                    not mpr in kernel
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: adamz at olympustechgroup.com

Broadcom 9480 (using SAS3516) does not currently work within the 11.2-Release. 
The native source and kernel modules included seem to be out of date.  This
card also seems to require the use of MRSAS and not MPR as the FreeBSD
documentation indicates.  From a kernel module perspective it was mrsas.ko and
the loader.conf configuration enabling that module that would get the
controller to work.

Upon booting a machine to the installer iso with hard drives connected to the
raid controller (mirrored pair), nothing is found.  I had created a forum post
(https://forums.freebsd.org/threads/broadcom-9480-sas3516-and-freebsd-11-2-release.66687/)
while I was initially troubleshooting this and what it came down to was that I
had to update either the source in the kernel and rebuild it or rebuild a
custom kernel with all of the Broadcom references removed and update the kernel
modules.  

I was successfully able to get a system working (if the OS hard drive is not
connected to the raid controller) by rebuilding the kernel and using the
MR_FREEBSD_DRIVER_MRSAS_7.5-07.705.01.00.tgz package downloaded from Broadcom
directly.  There may be a newer version available now but that was the package
that I had used while troubleshooting.

Without creating a custom installation iso to allow installation on an OS drive
that is  connected to the raid controller I'm not sure how to get around this.

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