SUMMARY: 4/470 + IPI = PSR release?

From: William Ang (
Date: Fri Mar 08 1991 - 15:08:26 CST

My Question:

>Does anybody know the difference between the regular SunOS
>release and PSR release? I know that you have to use
>PSR on SPARCservers such as 4/390 and 4/490 but regular
>release on 4/370 and 4/470. Since the CPU board in
>4/470 is the same in 4/490, What is the reason for using
>PSR release?

>I read the release Manual and can't find any reference.
>The only difference I can see is IPI drive support. May be
>the Backbone is different?

>So, if I want to put a IPI controller/drive in 4/470,
>do I have to use PSR release?


PSR release is only an issue for SunOS 4.0.3 and SunOS 4.1. It is
introduced basically to cover the kernel/hardware differences of a new
product after a specific SunOS release has been frozen. Such as 4.0.3
PSR A for 4/390 and 4.1 PSR A for 4/4X0.

4.0.3 PSR covers kernel difference, such as supports of IPI drives
4.1 PSR covers kernel difference, such as IO caching

If you are running SunOS 4.0.3/4.1, YES, you need to run PSR release.
You don't need to worry about PSR release in SunOS 4.1.1 anymore since
all the changes in PSR has been incorporated back into the generic release.
There is only Sun4 vs Sun4c distinction.

Many thanks to the following netters who have enlightened me: (Daryl Crandall)
"Anthony A. Datri" <> (Dennis Sexton)
eplrx7! (Keith McNeill) (Ed Arnold) (Jim Napier) (Hal Stern - Consultant) (Timothy G. Smith - Technical Consultant Sun Baltimore) (Todd Joseph) (Jon A. Tankersley)

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