Path: utzoo!utgpu!watmath!clyde!att!rutgers!gatech!hubcap!rwberry
From: rwberry@hubcap.UUCP (Robert W Berry)
Newsgroups: comp.os.minix
Subject: wierd problem building boot disk (bad magic number)
Keywords: kernel build magic number data space
Message-ID: <3931@hubcap.UUCP>
Date: 19 Dec 88 08:37:01 GMT
Organization: Clemson University, Clemson, SC
Lines: 29

Has anybody ever gotten an error from build saying:
    bad magic number in kernel data space

I looked through build.c and found that it checks for a magic number at
some wierd offset in the kernel binary.  I looked through the kernel to
try and find where the magic number is defined.  I know that build has
to patch some values into the kernel binary so it knows where the other
tasks are.  Where is this space reserved?  Is it just some initialized
variable?

What bother's me is that I re-compiled and the error went away.  I
didn't change any of the files.  It just went away.  Wierd.

Anybody have any insight into this?

Another quick question: why do you not have to link /usr/lib/head.s
into the kernel.  I can understand bootblok.s not needing this header,
but why the kernel?  Does it have anything to do with the entry point to
Minix being in assembler (mpx88.s?)

Thanks in advance, and have a nice Christmas out there in NetLand.

Bob

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