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

[Anders Larsen]

"Martin Krause" <Martin.Krause at tqs.de> wrote:
>That's very similar to your results, but not exact the same.
>Perhaps because you are using a 2.6 kernel. What CPU clock frequency
>do you use? We use 179 MHz.

Hi Martin,
my csb637 runs at 184MHz, and yes, my RSA encryption benchmark runs
slightly faster on the 2.6 kernel than on a 2.4.25 on the same HW
(but I can't tell why).
>
>Here are my nbench results for synchronous clock mode
>(nbench 2.2.1 on cmc-pu2 board):
...
>
>And this are the results for fast bus mode:

Err, didn't you say the results were the same?
Synchronous mode is about three times faster than FastBus mode
on your HW...

>For performance reasons I suggest we should switch back to asynchronous
>(or synchronous clock mode, no idea which one is favorable). Any 
>suggestions?

AFAICT synchronous clock mode performs marginally better than
asynchronous mode, but since asynchronous mode has less restrictions
than synchronous mode, asynchronous is arguably the better (= more
general) solution.
I'll submit an alternative patch.

Cheers
 Anders