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Date: Tue, 19 Dec 2006 11:32:30 +1300
From: Andrew Turner <andrew@fubar.geek.nz>
To: grehan@freebsd.org
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Subject: Re: FreeBSD on an Efika
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On Mon, 18 Dec 2006 09:04:41 -0800
Peter Grehan <grehan@freebsd.org> wrote:

> 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 ?

For reg I'm getting the range 0x0 - 0x8000000. For available I'm
getting the ranges 0x19111e4 - 0x02000000 and 0x24ff000 - 0x08000000.
These are consistent with the values retrieved from the open firmware
prompt.

> Did you read as well as write the physical value ?
Yes I can read and write to the physical address.

> 
> > 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() ?
The physical address is 0x1922000, the virtual address is 0xd0005000.

> After that 
> mapping has been created, can you read/write to the buffer in that 
> routine ?
Attempting to read or write to the value causes the kernel to stop.

> Do you end up in the trap handler if you touch msgbuf ?
Not as far as I can tell.

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