powerpc405 versus powerpc440

Josh Boyer jwboyer at linux.vnet.ibm.com
Fri Sep 5 01:07:25 EST 2008

On Thu, Sep 04, 2008 at 09:28:01AM -0400, Wood, Robert (GE EntSol, Intelligent Platforms) wrote:
>We are migrating to the Xilinx Virtex 5 devices and that means migrating
>our embedded software from the PowerPC405 to PowerPC440.
>Are there any gotchas we should be aware of, or will this be simple case
>of S/W migration :-)

Erm.  405 and 440 have entirely different MMUs.  405 has real-mode, and 440
is BookE and therefore has the MMU always on.

That is mostly an impact to the kernel itself and not to userspace.  But it
can be annoying if you aren't used to dealing with BookE style CPUs.


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