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Chapter 3
Miscellaneous
Real Time Clock (RTC)
The LittleBoard 800 contains a Real Time Clock (RTC). The BIOS (CMOS) RAM is backed up with a
Lithium Battery. If the battery is not present, the BIOS has a battery-free boot option to complete the
boot process.
Temperature Monitoring
The ADM1023 performs CPU temperature monitoring. This device has an input connection from the
thermal diode in the Intel Celeron M or Pentium M CPU. The SMBus is connected to a dedicated
thermal alert pin in the ADM1023 and the other devices on the SMBus.
NOTE
The LittleBoard 800 requires a heatsink for both Celeron M CPUs and a
heatsink for the Pentium M CPU below 70° C.
Oops! Jumper (BIOS Recovery)
The Oops! jumper is provided in the event the BIOS settings you've selected prevent you from booting
the system. By using the Oops! jumper you can prevent the current BIOS settings in the EEPROM from
being loaded, forcing the use of the default settings. Connect the DTR pin to the RI pin on serial port 1
(COM 1) prior to boot up to prevent the present BIOS settings from loading. After booting with the
Oops! jumper in place, remove the Oops! jumper and go into BIOS Setup. Change the desired BIOS
settings, or select the default settings, and save changes before rebooting the system.
To convert the Serial A interface to an Oops! jumper, short together the DTR (7) and RI (8) pins on
Serial A (J11) header for Serial Port 1. As an alternate, short the equivalent pins, 4 and 9, on the Serial
Port 1 DB9 connector as shown in Figure 3-2.
Serial A Interface (J11)
for Serial Port 1
(or COM1 Port)
Top View
Serial Console
The LittleBoard 800 supports the serial console (or console redirection) feature. This I/O function is
provided by an ANSI-compatible serial terminal, or the equivalent terminal emulation software running
on another system. This can be very useful when setting up the BIOS on a production line for systems
that are not connected to a keyboard and display.
Serial Console Setup
The serial console feature is implemented by connecting a standard null modem cable or modified serial
cable (or "Hot Cable") between one of the serial ports, such as Serial 1 (J11A) and the serial terminal, or
a PC with communications software. The BIOS Setup Utility controls the serial console settings on the
LittleBoard 800. Refer to Chapter 4, BIOS Setup for the settings of the serial console option, the serial
terminal, or PC with communications software and the connection procedure.
Hot (Serial) Cable
To convert a standard serial cable to a Hot Cable, specific pins must be shorted together at the Serial port
connector or at the DB9 connector. For example, short the RTS (7) and RI (9) on the respective DB9
port connector as shown in Figure 3-3.
56
19
9
7
5
3
1
10
8
6
20
4
2
Figure 3-2. Oops! Jumper Connection
Reference Manual
Standard DB9 Serial
Or
Port Connector (Female)
Rear View
Hardware
1
2
3
4
5
6
7
8
9
LittleBoard 800
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