[Bug 200460] sysutils/grub2-bhyve: hangs when using nmdm as console

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200460

            Bug ID: 200460
           Summary: sysutils/grub2-bhyve: hangs when using nmdm as console
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kmoore at FreeBSD.org
          Reporter: olgeni at FreeBSD.org
          Assignee: kmoore at FreeBSD.org
             Flags: maintainer-feedback?(kmoore at FreeBSD.org)

When using nmdm(4) as the console (like nmdm0A), grub-bhyve 0.30 will hang
until the corresponding "B" device is open by another process.

For example:

# grub-bhyve -c /dev/nmdm0A -d /boot/grub -r hd0,msdos1 -m debian-7.8.0.map -M
1024 debian-7.8.0

will hang until any command accesses /dev/nmdm0B:

# kermit -l /dev/nmdm0B

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