Bios Virtual Dip Switch; What Is Bios Virtual Dip Switch - NEC Express5800 1160Xd User Manual

BIOS Virtual DIP Switch

What is BIOS Virtual DIP Switch?

SP command "su" specifies the settings of the BIOS virtual DIP switch. When the
setting value specified in Table 4-28 is set to the BIOS virtual switch, the BIOS
performs the operation described in the table. A logical-or of the setting value in
Table 4-28 can be set to the BIOS virtual DIP switch. When this happens, the BIOS
performs plural operations at the same time.
Changing a setting can cause the server to lose system
configuration information. Use the virtual DIP switch function with
caution. Call your system administrator or NEC Technical Support
personnel for help before setting this switch.
Setting Value
80000000
40000000
20000000
10000000
00000100
00001000
00002000
00000004
00000002
00000001
00003102
00000000
Note: PCI Online Maintenance means PCI Hot Plug
CMOS/NvRAM Clear (80000000/40000000/20000000/10000000)
For information on the setting value to clear CMOS/NvRAM, refer to "When You Should Change the
Settings" earlier in this chapter. The setting value is cleared to "0" when CMOS/NvRAM is cleared.
Enables CMC 1H Mask function (00000004)
Setting the bit to "1" enables the CHC 1H Mask function. If the bit is not cleared to "0", the bit setting value
"1" remains. SP command "su" is used to clear the bit to "0".
BIOS/EFI can use USB devices (00000002)
Setting the bit to "1" enables the BIOS/EFI to use USB devices. If the bit is not cleared to "0", the bit
setting value "1" remains. SP command "su" is used to clear the bit to "0".
Disables PCI online maintenance function (00000001)
Setting the bit to "1" disables the PCI online maintenance function. If the Operating System does not
support PCI online maintenance, the bit should be set to "1". System startup may be faster. If the bit is not
cleared to "0", the bit setting value "1" remains. SP command "su" is used to clear the bit to "0".
! CAUTION
Table 4-28. Virtual DIP Switch Setting Value
Operation
Clears CMOS/NVRAM entirely.
Clears the Supervisor/User Password specified by Setup.
Clears only the area of CMOS/NVRAM used by the BIOS.
Clears only the area of NVRAM used by EFI/OS.
PCI-X Performance Increase
USB FDD ATAPI emulation mode
Disable I/O slot power control from OS
Enables CMC 1H Mask function.
BIOS/EFI can use USB devices.
Disables PCI Online Maintenance function.
Windows Server 2003
Linux (NEC Linux)
BIOS Setup 4-59