[RFC/PATCH 1/3] powerpc: add ioremap_bat() function for setting up BAT translated IO regions.

[Kumar Gala]

On Aug 6, 2008, at 1:02 AM, Grant Likely wrote:

> From: Grant Likely <grant.likely at secretlab.ca>
>
> ioremap_bat() is useful for things like mapping SoC internally  
> memory mapped
> register and early text because it allows mappings to devices to be  
> setup
> early in the boot process where they are needed, and the mappings  
> persist
> after the MMU is configured.
>
> Without ioremap_bat(), setting up the MMU would cause the early text
> mappings to get lost and mostly likely result in a kernel panic on  
> the next
> attempt at output.
>
> Signed-off-by: Grant Likely <grant.likely at secretlab.ca>
> ---

why can't we just do this in ioremap itself?

- k