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AC450NX Rack Server System Product Guide
194
Table 17-1. Configuration Jumpers (J2C1)
Pins (default in bold) Function
1(B–C) Disable programming onboard programmable devices
1(A–B) Allow programming of onboard programmable devices
2(B–C) Normal boot
2(A–B) Boot Recovery BIOS
3(B–C) Reserved
3(A–B) Reserved
4(B–C) Allow BIOS flash update
4(A–B) Disable BIOS flash update
5(B–C) Do not clear CMOS
5(A–B) Clear CMOS
6(B–C) Do not clear password
6(A–B) Clear password
7(B–C) Do not override PHP switches
7(A–B) Override PHP switches
8(B–C) Disable I/O SPI chain
8(A–B) Allow I/O SPI chain
Restoring CMOS to Default Values
The jumper on J2C1 pins 5(B-C) preserves the settings stored in CMOS nonvolatile memory
(NVRAM) during server reset. Moving the jumper to pins 5(A-B) clears CMOS and sets it and the
real-time clock (RTC) to the Setup default values during server reset.
To clear CMOS and restore the Setup default values:
1. Observe the precautions on page 115, “Safety Guidelines.”
2. Turn off the server, and unplug the AC power cords from the power supplies or wall outlets.
3. Remove the top and right side covers. See Chapter 12, “Server Covers:
Removing/Reinstalling.”
4. Move the jumper on J2C1 from pins 5(B-C) to pins 5(A-B).
5. Reinstall the covers, and plug in the power cords.
6. Turn on the server, and wait for POST to complete. This automatically restores CMOS and
RTC to Setup default values. See Chapter 3, “Power-on Self Test: Description/Running.”
7. Turn off the server, unplug the power cords, and remove the top and right side covers.
8. Move the jumper from J2C1 pins 5(A-B) to pins 5(B-C).
9. Reinstall the covers, and plug in the power cords.
10. Run the SSU to configure your server. See Chapter 5, “System Setup Utility: When to Run.”