[Bug 196497] On some PowerBooks vt crashes in early boot

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196497

            Bug ID: 196497
           Summary: On some PowerBooks vt crashes in early boot
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: ppc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jhibbits at FreeBSD.org

On a specific PowerBook (1.5GHz, adb keyboard, ATI graphics), vt crashes very
early in boot, before printing even the `KDB:...' lines, unless we break into
Open Firmware at boot, and boot the loader using the `mac-boot' command. 
Removing vt and using sc instead works just fine.

This is an anomaly, as on 3 other PowerBooks of different generations from this
one work just fine with vt(4).

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