visopsys.org

The problem was related to prioritizing multiple interrupts-in-service, for anyone who's interested in that level of detail ;-) Andy: The "prioritizing multiple interrupt..." and very related topics are covered in pretty decent detail in this link: http://developer.novell.com/devres/langr...

I've observed that single stepping the kernel, you'll often invoke an artificial timeout. During one run, the visopsys screen had: Visopsys 0.75 Copyright (C) 1998-2014 J. Andrew McLaughlin Starting, one moment please ... Detecting hardware: real time clock Error::kernelRtcDriver.c:waitOperationComp...

Andy: IMO Visopsys runs pretty well without the APIC enabled. With APIC enabled, I don't get the same result every time. It seems to be a little varied as to what will happen. I'm not familiar enough with visopsys at this time to make any intelligent guesses as to cause. Working on it though! BTW: I...

This post was redundant with a following one. (should be deleted)

Many thanks Andy. Hopefully, I can muddle around in your modified kernel now, but with a little better map to see where I'm going!

andymc wrote:...... I'll do that tonight (UK time) when I get home -- after the office Xmas party. Let's see if I remember!

Depending on the type of eggnog they'll have there?

LOL - Have fun at your party.

- Ron

Andy: It seems the kernel on the 2014-12-07 ISO is a release version? It'd be nice to have debug info on interim releases to help out with the debugging. $ gdb ./visopsys GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://g...

Hi Andy: Yes, I think the Debian (and by heredity Ubuntu) distros tend to lag behind the current version of some apps like QEMU. Anyway, as I posted in another thread, I tried the latest ISO (2014-12-07) and it works fine with my QEMU 1.1.2 running on Debian Wheezy 7.5 Edit: It looks like there are ...

Hello again Andy:

Well, I downloaded the ISO image from the link in your message (above), and it works fine with my QEMU version 1.1.2, running on Debian Wheezy (7.5).

Edit:
It looks like there are some intermittent issues, found on a second run. The system sometimes hangs as it did before.

Alright, I did get Qemu up and running. There are some seemingly-harmless error messages from the RTC driver, but the APIC code seems alright now. The problem was related to prioritizing multiple interrupts-in-service, for anyone who's interested in that level of detail ;-) Hi Andy: I've had to do ...