On 28 December 2012 00:03, Jakob Bohm
<address@hidden> wrote:
On 12/27/2012 7:08 PM, John Floren wrote:
I'm working on an OS kernel that currently reboots by writing 0x02,
then 0x06 to port 0xcf9. This seems to work fine for real hardware,
but I have not been able to make it work in QEMU. Before I go digging
through the QEMU source to try and verify one way or another, I
thought I'd ask here: Can I use 0xcf9 to reboot on QEMU?
Where did you pick up that technique?
Looking in an old PC manual, I see that port 0x0f9 (often, only low 10
bits were decoded) is in the range of ports used for talking to the
80x87 coprocessor, which has long since been replaced by native x87
instruction support inside the CPUs, so I am quite unsure what is
supposed to be responding to I/O port 0xcf9 on a real PC.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. http://www.wisemo.com
Transformervej 29, 2730 Herlev, Denmark. Direct +45 31 13 16 10
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