Hi Jared,

Good to hear about that. Actually I too took the port of mpc860 from tokuda.net
and I am using Analog & Micro 875 evalboard.

There are three regions in that board (A & M) and I have mapped those regions
as:
Region  VMA           PMA
IMMR:   0xfa200000  0xfa200000 for 8 MB (TLB 0)
SDRAM:  0xc0000000  0x00000000 for 8 MB (TLB 1)
flash:  0xfe000000  0x08000000 for 8 MB (TLB 2)

Further when an exception is set, it creates another mapping for 0x0 -> 0x0 for
8 MB for the real-mode to work I suppose.

I didn't make too much of modifications than this and setting the avail_start
and end of memory for VM.

I wasn't able to progress further than having the LED and serial driver
working.
Now as soon as I enable MMU the core freezes. Recently I purchased a wiggler to
check where the core faults. I was unable to step through as wiggler didn't
have single-step capability.

I guess since the TLBs are also set, there shouldn't be any exceptions taken at
that point.
I see that the LR was junk and PC was either start of m/c or softemu. I tried
disabling interrupts, bzeroing bss beforehand, etc. I am not sure why it is
faulting.

I would appreciate any help in bringing up this board.

Thanks,
Srini.


--- Jared Momose <jpmomose@hotmail.com> wrote:
> Srinivasa,
> 
> There is a port for the OpenBlockS/mpc860 out of Japan.
> 
> http://www.tokuda.net/NetBSD/OBS/index.html
> 
> I was able to get this mpc860 kernel ported and running on an ads885 eval
> board from Freescale (previously Motorola) as well as an mpc875 board from
> Analogue & Micro Ltd.
> 
> Also, I know of at least one other person who has a port based on the above,
> running on an mpc823.
> 
> jared.
> 
> 
> ----- Original Message ----- 
> From: "Srinivasa Kanduru" <ksraghavan@yahoo.com>
> To: <port-powerpc@NetBSD.org>
> Sent: Friday, April 30, 2004 3:36 PM
> Subject: Porting to 875
> 
> 
> > Hi,
> >
> > I am having problems with porting netbsd to mpc875.  I guess it is to do
> with
> > the setting of exceptions. I think I have setup the TLB settings correctly
> for
> > SDRAM, flash and IMMR, but when I enable MMU it is causing a machine
> check. Is
> > there a port for 875 or 860 already that I can use ?
> >
> > I would appreciate any pointers in this direction.
> >
> > Thanks,
> > Srini.
> >
> >
> >
> >
> > __________________________________
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