[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Haavard Skinnemoen <haavard.skinnemoen@atmel.com>]

Detlev Zundel <dzu@denx.de> wrote:
> So this patch replaces a construct which seems to be valid over all
> architectures by a construct which is only used in avr32, right?  It
> also deletes the explicit statement that such a mapping is not needed
> any further.

Problem is that in order to make the CFI driver work on avr32, we need
to change the map_physmem() macro to return the physical address
unchanged.

> Isn't this a step backward?  Can't you put the functionality inside the
> map function and leave the unmap a noop?

I agree it's a step backward, but since the previous flamewar didn't
get us anywhere, I decided to go for a compromise this time. At least
this small architecture-specific kludge is localized to
architecture-specific code.

The map_physmem() macro currently does exactly the same thing as the
uncached() macro, and the unmap is a noop, but the next patch changes
it in order to fix the CFI driver. If the next patch is applied without
this patch being applied first, the SDRAM driver will do cached
accesses during initialization, and that may cause the initialization
to fail.

Haavard