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Re: XScale PXA255 MMU Translation Table Query


On Wed, Jul 30, 2003 at 11:43:25AM +0000, Francis Musto wrote:
> I am using the MPC5 & uE250 examples for a port to our PXA255 platform.
> 
> I notice that both tables in hal_mmu_init map the flash from 0 to 
> 0x50000000 & SDRAM from 0xA0000000 to 0 as well as platform specific 
> peripherals to other addresses.
> 
> Why?
> 
> Is there a reason for not leaving everything where it's actual address is? 
> If so is there some documentation discussing this?

The vectors on ARM are at address 0x00-0x20. Thinks like IRQ, FIQ,
etc. In order to change them so you can install interrupt handlers,
they have to be in RAM, not FLASH.

     Andrew

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