Instruction OCM

Stephen Neuendorffer stephen.neuendorffer at
Tue May 20 02:58:44 EST 2008

The traps are down there in low memory.  trap 700 is probably the one
that deals with MMU exceptions.  My guess is your OCM region is
overlapping with the DDR memory containing that code.


> -----Original Message-----
> From: at
> at] On Behalf Of mojtaba
> Sent: Monday, May 19, 2008 8:17 AM
> To: linuxppc-embedded at
> Subject: Instruction OCM
> Dear all,
> I cannot run Linux when I have an instruction OCM in my design but,
without instruction OCM
> everything is fine. I tried to do some debugging. It seems that the
Linux memory management unit has
> a problem with that.  After entering the MMU initialization phase, it
suddenly jumps to address
> 0x00000700 it get stuck there. Is there anybody who have tried a
design with instruction OCM? Do I
> need to do special configuration for the Linux kernel?
> Regards,
> Mojtaba

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