Using The Clear Cmos Jumper - Sun Microsystems Sun Fire V60x Manual

3. Hold down the reset button for at least 4 seconds.
4. While the reset button is still depressed, press the power on/off button and hold
for at least 2 seconds.
5. Simultaneously release both the power on/off and reset buttons.
Upon completion of these steps, the BMC asserts the clear CMOS signal to emulate
the movement of the Clear CMOS jumper. The BIOS clears CMOS as if you had
moved the Clear CMOS jumper on the main board. CMOS is cleared only once per
front panel button sequence. The BMC releases the CMOS clear line during the next
system reset. Removing the Clear CMOS jumper from the main board can disable
the Front Panel CMOS reset function. In addition, the jumper should be retained in
case the CMOS needs to be cleared using the baseboard header.
4.4.2

Using the Clear CMOS Jumper

Follow these steps to clear the CMOS using the CLR\CMOS jumper on the main
board (see Figure 4-5):
1. Power off the system, but leave the AC power connected so the 5V standby is
available.
2. Verify that the CLR\CMOS jumper is in the "Clear" position.
3. Press the power on/off button.
When the BIOS detects a reset CMOS request (either through the front panel or with
the Clear CMOS jumper), CMOS defaults are loaded during the next POST sequence.
Note that non-volatile storage for embedded devices may or may not be affected by
the clear CMOS operation depending on the available hardware support.
4. Place the CLR\CMOS jumper in the "Normal" position.
Chapter 4 Powering On and Configuring the Server 4-7