[U-Boot-Users] [PATCH 4/4] add csb637 (at91rm9200) support

[Anders Larsen]

Hi,

this patch switches the at91rm9200 to asynchronous clocking mode after
initialization (it would otherwise stay in FastBus mode which is
the _slowest_ clock mode).
This lets the core run at full speed when not doing bus accesses,
increasing overall performance by a factor of four.

The performance difference between asynchronous ans synchronous
clocking mode as measured with nbench 2.2.2 disappears in the
statistical noise; since asynchronous clocking mode imposes less
restrictions on the clock frequencies it is the mode of choice.

This patch replaces my similar patch from 2005-04-29.

Changelog:
  * patch by Anders Larsen, 2005-05-03
    set the at91rm9200 to asynchronous clocking mode

Cheers
 Anders

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