10.6
User Selectable NVRAM Defaults
The BIOS provides a facility through which the user can save preferred setup option settings to
Flash memory (NVRAM). Then, if the BIOS detects that the contents of NVRAM is corrupt, the
user can elect to restore the contents from the saved settings, rather than loading factory
configured defaults. This facility also allows the board to operate without fitting the battery, but
with NVRAM settings different to the factory defaults.
The
Save User Defaults
option in the BIOS Setup
Exit
menu is used to write the current
NVRAM settings to Flash memory. When settings are saved to Flash memory, the current BIOS
date and time will also be stored; this allows the board to start operating with an appropriate date
and time.
NOTE
Saving settings to Flash memory may take number of seconds to complete.
The NVRAM restore feature is controlled by the User/Test Jumper (see Figure 10-2). When the
User/Test Jumper is in the “Restore NVRAM/MTH” position and the BIOS detects that the
NVRAM contents are corrupt, NVRAM settings will be restored from Flash memory (provided
that valid settings have been saved). When the switch is in the Disable/Soak position, the
factory-configured defaults will be used.
To configure and save preferred NVRAM settings:
l
Configure the BIOS in the usual manner via the Setup menus
l
Reboot the board and allow it to proceed through to the bootloader without error
l
Reboot the board and enter Setup
l
From the
Exit
menu, select
Save User Defaults
l
Set the User/Test Jumper to enable the restore feature
NOTE
The User/Test has a different function if the board is configured for CPSA (Factory
Test) mode. If the board is ever returned to the factory for repair, this jumper will
be changed and the User Selectable NVRAM settings may be affected.
10-10
PP 110/01x
PC BIOS
User/Test
Restore
NVRAM/MTH
Disable/Soak
Figure 10-2 User/Test Jumper
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