[Bug 195819] TSC calibration can hang FreeBSD in Hyper-V Generation 2 VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195819

--- Comment #17 from Ed Maste <emaste at freebsd.org> ---
> With "set machdep.disable_tsc_calibration=1", the bootup can go further but the
> VM still hangs later -- I guess this may be a bad side effect of disabling TSC
> calibration and I guess the TSC has to be calibrated here, e.g., by the ACPI
> timer?

When machdep.disable_tsc_calibration=1 is set the TSC frequency should be
determined from the CPU identification instead.

Are you able to try a verbose boot with machdep.disable_tsc_calibration=1 set,
and attach the boot log?

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