On 8/6/05, Alan Barrett <apb@cequrux.com> wrote:
> On Sat, 06 Aug 2005, Alan Barrett wrote:
> > When booting an i386 system in a virtual machine under qemu
> > (pkgsrc/emulators/qemu), the second stage boot loader's timeout expires
> > much too quickly.  If I set the timeout to 6000 seconds (via installboo=
t
> > -o timeout=3D6000), then I observe it counting down at about 100 counts
> > per second, instead of 1 count per second.
>=20
> BTW, the timeout in the mbr_bootsel code (sys/arch/i386/stand/mbr/mbr.S)
> does not suffer from this problem.  mbr_bootsel uses the "INT 1A" BIOS
> call to count ticks (at approx 18.2 ticks per second), and that works
> well enough.  boot2 uses "INT 15H function 86H", and that doesn't work
> properly under qemu.
>=20
> And does the fact that the kernel running under qemu prints "clock:
> unknown CMOS layout" have anything to do with this problem?  (ifdef
> DIAGNOSTIC in sys/arch/i386/isa/clock.c:clock_expandyear().)
>=20
> --apb (Alan Barrett)
>=20
It's a Qemu issue. I've got the same problem under GNU/Linux.
You should have a look at the Qemu man page, i think they talk about
timer problems.
--Thomas Lecomte