From owner-freebsd-ppc@FreeBSD.ORG  Mon Dec 18 17:22:42 2006
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Date: Mon, 18 Dec 2006 09:04:41 -0800
From: Peter Grehan <grehan@freebsd.org>
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To: Andrew Turner <andrew@fubar.geek.nz>
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Cc: freebsd-ppc@freebsd.org
Subject: Re: FreeBSD on an Efika
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Hi Andrew,

> I'm getting correct values from mem_regions. I can read from the
> physical address.

  What values are you getting back ? Does it look like what the system 
should have ? Did you read as well as write the physical value ?

> It is reading from msgbufp where it stop working.

  What're the virtual/physical values used when creating the msgbuf 
mapping with pmap_kenter() in machdep.c:powerpc_init() ? After that 
mapping has been created, can you read/write to the buffer in that 
routine ? Do you end up in the trap handler if you touch msgbuf ?

  pmap_kenter() is fundamental to the operation of the system and 
probably OK, so something else must be afoot.

later,

Peter.