BIOS Setup 4-59
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.
!
CAUTION
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.
Table 4-28. Virtual DIP Switch Setting Value
Setting Value Operation
80000000 Clears CMOS/NVRAM entirely.
40000000 Clears the Supervisor/User Password specified by Setup.
20000000 Clears only the area of CMOS/NVRAM used by the BIOS.
10000000 Clears only the area of NVRAM used by EFI/OS.
00000100 PCI-X Performance Increase
00001000 USB FDD ATAPI emulation mode
00002000 Disable I/O slot power control from OS
00000004 Enables CMC 1H Mask function.
00000002 BIOS/EFI can use USB devices.
00000001 Disables PCI Online Maintenance function.
00003102 Windows Server 2003
00000000 Linux (NEC Linux)
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”.
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