2011/5/24 Michael Lotz <mmlr@xxxxxxxx>:
Since the APIC timer is calibrated using the TSC which in turn is
calibrated using the PIT it's not so surprising that both fail in
this
case.
What you could try is to still use mode 0, but instead use a
different
channel, channel 2 (as channel one isn't usually implemented
anymore)
in the TSC calibration. That is the combination that Linux uses for
their "fast TSC calibration using PIT" and I think also for the
corresponding "slow" version. The dmesg output of Linux should tell
you
if and how it calibrated the TSC which should indicate what method
is
usable.
Bingo!
Using PIT channel 2 (in the kernel) works, and haiku boots correctly
on XenServer. Note that modifying the code in the boot loader didn't
make a difference. I had instead to change line 55 of
src/system/kernel/arch/x86/timer/x86_pit.cpp
from
out8(PIT_SELCH0 | PIT_RWBOTH | PIT_MD_INTON0, PIT_CTRL);
to
out8(PIT_SELCH2 | PIT_RWBOTH | PIT_MD_INTON0, PIT_CTRL);
If applied, would close ticket #4500. Thanks for the tip!
