Lenovo System x3500 M4 - Page 44

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Off
On
SW4 switch block
Figure12.Locationanddescriptionofswitchesandjumpers
Note:Ifthereisaclearprotectivestickeronthetopoftheswitchblocks,youmustremoveanddiscardit
toaccesstheswitches.
ThefollowingtabledescribesthefunctionsoftheSW4switchblockonthesystemboard.
Table3.SystemboardSW4switchblockdefinition
Switch
numberSwitchname
Default
positionDescription
1UEFIbootbackup
OffWhenthisswitchisoff,theprimaryfirmwareROMpageis
loaded.Whenthisswitchison,thesecondary(backup)
firmwareROMpageisloaded.
Note:ChangingthepositionoftheUEFIbootbackswitch
beforetheserveristurnedonalterswhichflashROMpageis
loaded.Donotmovetheswitchaftertheserveristurnedon.
Thiscancauseanunpredictableproblem.
2
SystemTPMphysical
presence
Off
IndicatesaphysicalpresencetothesystemTPMwhenon.
30Systemx3500M4InstallationandServiceGuide