I would venture a bet that the error when trying to IPL an unsupported operating system in an IFL has never depended on something buried in the operating system's ipl code. It is not that the O/S is IFL aware. Quite the opposite, that the IFL is O/S aware, is the only way to enforce the restriction with any assurance that it is being enforced. If it were buried in the ipl code of the O/S, it would be subject to being cracked, probably with only minimal effort.
Regards, Richard Schuh -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of McKown, John Sent: Friday, July 06, 2007 10:59 AM To: [email protected] Subject: Re: OS/390 as zVM 5.2 Guest on z9 ?? > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hammock > Sent: Friday, July 06, 2007 12:51 PM > To: [email protected] > Subject: Re: OS/390 as zVM 5.2 Guest on z9 ?? > > > Well, it turns out that there are some VERY strange things floating > around... I'm not ready to discuss some of what I've found > yet, but let's > just say it is "interesting"... and I have some more > testing to do.... > > Mike Hum, you're message made me think of something. I wonder when OS/390 2.9 came out. Was it before the zSeries? I bet so. That probably means that the code which causes a hardware check when OS/390 2.10 or z/OS are IPL'ed on an IFL engine is not in OS/390 2.9. Now I'm curious if IBM put something into the microcode on the zSeries and above to force an error with non-IFL aware versions of OS/390 that otherwise might run on an IFL. <hum, as Artie Johnson would say: "Verrrryyyy Interesting!" -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it.
