A utility to temporary modify CPU and FSB clock settings for
Sam440ep boards (all versions)
Max m3x Tretene, Soft3
What it does:
* it allows to temporary modify CPU and FSB clock settings.
The new configuration to become active requires a soft reboot,
and will be active until the next hardware reset (from the
computer case button) or until the board is switched off.
After that the board will boot again with the original clock
This way it's possible to safely reboot the board in case
a wrong clock setting was chosen.
* it's possible to over clock and under clock the board. Under
clocking may be useful in case you need to run the board for
a long time on a specific task which requires low CPU power,
for example, allowing to save on electric energy consumption,
and lowering the heat produced.
* it reports some useful information on the board, and may
help to solve some misconfiguration problems
How to use:
* run the utility from WB, check if all the reported board
informations are right, select a new clock configuration and
click the "Set and reset" button.
The board will reboot to U-Boot, therefore close all active
applications and save
all works before.
* the 440ep clock setting is quite complex, it allows to create
more than 500000 not
unique combinations of CPU, FSB, PCI and onboard peripherals
Great care has been taken to choose only around 30 combinations
which create working frequencies on the Sam440ep boards.
Not all the Sam440ep board models can reach the same CPU /
FSB frequencies, and some boards can reach frequencies higher
* Sam440ep mini-itx: this board wasn't designed with over
clocking in mind, therefore
it's highly suggested to NOT select configurations with a
FSB frequency higher than 133 MHz. Even better, select where
possible, frequency around 120 MHz when
using CPU frequencies above 667 MHz, for example CPU = 733,
FSB = 122.
* Sam440ep flex: can operate at higher FSB frequencies, up
to 167 MHz, but reaching that limit depends on the actual
DDR module used on the board.
* Sam440ep flex SE: same notes as the mini-itx model
* when over clocking, take care the CPU and all the board
is well cooled, and run some
intensive tests before assuming the board is stable with the
new settings. Running memtester alone is not enough to assume
if a board is stable.
BIG FAT NOTE:
* There is the remote possibility that something may go wrong
damaging your hardware. Use this tool with extreme caution
and at your sole risk.
Please beware that every damage to the board due to incorrect
settings or misuse of
this tool will not be covered by the board warranty.
2-Aug-2011 - Version 1.0
* many thanks to Andrea afxgroup Palmatè for betatesting,
Stefano Guidetti and
Philippe Ferrucci for their help developing the utility.
* if you find this utility useful, please consider to make
a donation via the Donate button on this page, thanks.
Requires: AmigaOS4.1 and Sam440ep (mini-itx or flex-atx)
further information, please write to: firstname.lastname@example.org