[Bug 199197] FreeBSD should be able to PXE boot directly from ISO file

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199197

            Bug ID: 199197
           Summary: FreeBSD should be able to PXE boot directly from ISO
                    file
           Product: Base System
           Version: 9.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: will at FreeBSD.org

Since 9.0+, FreeBSD has not been able to PXE boot directly from an ISO file. 
The kernel will start (having been set up by the loader), but multiuser will
fail because the ISO image was only accessible in protected memory, before the
kernel booted.

It should be copied as a linker file for the kernel to reference, and then geom
should be modified to try to attach to linker files (at least this particular
one), enabling iso9660 tasting to work and therefore mountroot.

I have done some work along these lines, but was not able to finish before
switching to other work.  If anyone wants to try to fix it this way (there may
be other ways I'm not aware of), let me know and I will dig the patch out from
the sands of time.

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