SV: Re: SV: Re: MPC860 or the mpc850de

[Roger.M.Strandberg%telia.se@localhost]

Due to my problems with Netbsd/amiga this night, i still don't have a 
cross env.
The configure script hangs or netbsd. So meantime i (today) will make a 
cross env on a Linux i386,  just to get going.
And later when the Netbsd system's will be bulid i will use a Netbsd 
system. 

How are you David going to setup the memory and Boot Rom adress?

I want to be able to change the interupt vectors when i boot from a 
PCMCIA E-HD.
This means that when the boot prom is selected i need to setup RAM into 
adress 0.
Then load kernel from PCMCIA into RAM starting at 0.
Then i need too swap offset for interupt vectors and jmp to Restet 
vector. DONE.

It will be interesting to look at the ns3c port when it becomes 
available.

Is egcs-1.1.1 good? like easy to Configure?

For my Boot prom i can use GCC and newlib, but later i whould need egcs 
if it is easier to cross compile.
If i reside on a PPC like mac whould i realy need a cross compiler when 
i will build Netbsd for m8xxpcpc? maybe.


/Roger Strandberg

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Ämne:   VB: Re: SV: Re: MPC860 or the mpc850de

Roger:

> Well! Lets go with sharing.  :-)

Sounds good!
 
> We planed too use a Mac6100 to handle the Cross compiler env.
> (we got that machine for free, low budget 5000 for Dev board, 50000 
for 
> 10 prototyps)
> The problem we faced was:
> No Monitor for the Mac ie. doesn't start.
> We don't now what typ of memory model the mac use, like Big-endian 
ocg 
> PPC-endian or Little-endian.

I'll be using big-endian, since the PowerPC architechture supports it
the best.

> (endian-ness is a problem for us).

Endianness is a problem for everyone.  :)

> Netbsd can't run on that old mac, so we where going to use MkLinux.

We are using NetBSD on i386 as our host platform, and an MBX821 
development
board from Motorola as the target.  Even though we usually run i386 
Linux, I
decided it would probably be easier to build a new NetBSD system using 
an
existing NetBSD system.
 
> So, to get going we dug up some old A3000 with 2*1 GB HD.
> Benefit: well we have all doc on A3000, it use Big-endian model the 
> same as we are going to use and we 
>       can run Netbsd
> Problem: No Network card (useing Serial), Low memory, slow. Take like 
> 2-6 to compile GCC and BINUTILS
> We use a Win95 to edit the files on the A3000 and to burn Flash proms.
> BUT is do what you tell it to do. 
> I will read about the MPC821, so we can discuss general porting of 
the 
> Netbsd.

I have studied the data books on the MPC821/860.  The memory management
hardware is simpler than the 600 series, but Motorola made an effort to 
make
it compatible.
 
> My previous crosscompiler env was gcc 2.7.2.
> Have you find any problem to make a cross compiler with gcc2.9.1-2 ?
> If it's all goes well i will have a working env to night.

I have not tried gcc-2.9x.  The NetBSD "cross" packages use EGCS-1.1.1,
which we nearly have working as a cross-complier from i386-aout to 
i386-elf.
 
> Have you found any more Doc or howto than this:
> http://tofu.alt.net/~lk/291.paper/291.paper.html

I followed these links:

        http://www.netbsd.org/Documentation/
        http://www.netbsd.org/Documentation/kernel/
        http://www.netbsd.org/Documentation/kernel/programming.html

You might also try www.openbsd.org.

> Are there any DOC that descripes what functions that should reside in:
> locore.s
> pmap.c
> machdep.c
> ?

Other than 291.paper.html, I've been looking at the other ports source 
code
for examples.

> Have you any experience with psim (ppc simulator) ?
> I will try it out any way.

Not yet.
 
> Have you pinked a starting point?
> I will pick Macppc i belive and with alot of looking on the Amiga 
port.
> I'm new too PPC asm, but not for long.. ;-)

I am proceeding as follows:

  1. Build native NetBSD-1.4.1 system, host=i386-aout, target=1386-aout
     -- done
  2. Build native NetBSD-current system, host=i386-aout, target=i386-elf
     -- in progress
  3. Build cross NetBSD-current system, host=i386-aout, target=ofppc
     -- still to do
  4. Copy ofppc to a new directory, say "m8xxppc", and begin modifying 
boot
     sequence, memory management, and I/O drivers.

I think that the ofppc port may be simpler, thus requiring less
modification.  I could be wrong here.
 
> /Roger Strandberg
> Hansson & Strandberg Communication

Regards,

David Querbach,
Real-Time Systems Inc.

P.S. to cc'd recipients:  Some of you asked to be copied on MPC821/860 
work. 
I propose posting my responses to tech-embed from now on, in order to 
keep
the conversation visible to anyone new who might drop by, rather than
copying you directly.  Please let me know if you still want copies sent
directly to you.
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