[U-Boot-Users] 83xx address translation: is it really necessary?

[Kumar Gala]

On Aug 7, 2006, at 3:39 PM, Timur Tabi wrote:

> Kumar Gala wrote:
>
>> There is a performance improvement from using address translation.
>
> Can you explain that?  Obviously, just translating the addresses  
> can't improve performance, especially since the translated  
> addresses have the same numerical value, so there must be some side- 
> effect.

If you dont do address translation you can't set the WIMG settings  
for the various regions of memory.  For example you can't mark normal  
memory as cacheable.

>> You
>> need to make sure you are setting up the BATs properly for your  
>> address
>> map.
>
> Well, I'm using the same BATs as the 8349EMDS, so I don't know what  
> the right BATs are.

Is the physical memory map the same on the ITX as it is on the 8349EMDS?

- kumar