J0 Vm wrote:
> What is MPU in an ARM? I cant find good information bout that subject.
>
> Is it a new memory management system?

Not new. Memory Protection Unit. Allows you to describe a couple of 
memory regions in terms of access permissions, cache attributes/policy, 
etc.
No address translation, though.

Examples: ARM946, Cortex-M3 (optional), ARM1156, Cortex-R4

--
Marcus
http://www.doulos.com/arm/

J0 Vm wrote:
>
> I cant find good information bout that subject.
>
Define "good information".  For ARM cores with an MPU, it is described 
in the associated "Technical Reference Manual" for the core, for example 
for Cortex-M3: 
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0337e/BIHJJABA.html 
and for ARM ARM1156T2F-S: 
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0290g/Behjcgbj.html. 
I suggest that those are pretty comprehensive.

Not all ARM cores have an MPU, and not all ARM MPUs are identical across 
cores.