Re: Linux on PPC

In message [ref] you wrote:

quoted

Many memory maps (especially those provides with some eval boards for
demonstration purpose) will NOT work with Linux.  Remember  that  the
memory  map  is  usually  not  cast  in  silicon,  but implemented in
software, so you can change it as needed.

Right, thats I made sure to say; Physical Memory Map.

That's what I mean: the physical memory map  is  usually  set  up  in
software, so it can be changed to your needs.

For example, on the Artesyn manual on their PrPMC they give a
physical memory map, and in the Yosemite board, there is a
physical memory map. I know many of the memory areas can be
redefined in hardware to have a different memory location, but
its still a physical address.

...which usually can be reprogrammed in software.

Now, when the bootloader loads, eg. U-Boot, it sets up the
memory management. Now this is where my understanding gets
shakey, since I haven't looked at much of the code, so perhaps
you can clarify. The translation unit (TLB) maps virtual addresses
(or should that be MMU output addresses) into physical addresses,

U-Boot usually does not use the MMU. 

What are the basic requirements for a Linux memory map then?

See the FAQ.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
It is surely a great calamity for  a  human  being  to  have  no  ob-
sessions.                                                - Robert Bly