Recovering The Bios; Boot Block Write Protect; Fault Resilient Booting (Frb) Timer Enable Jumper - NEC LS2400 User Manual

Recovering the BIOS

This procedure should only be performed by qualified technical
personnel.
Leave Recovery Boot jumper at factory-default setting.
This jumper should only be moved by a technically qualified
person.

Boot Block Write Protect

The jumper at pins 13, 14, and 15 controls whether the BIOS boot
block is protected from being erased and reprogrammed.
Leave boot block jumper at factory-default setting:
Programming the boot block incorrectly will prevent the
system from booting. Programming should only be done by a
technically qualified person. The procedure requires a special
"Boot Block Update Utility." Contact your dealer or sales
representative for more information.

Fault Resilient Booting (FRB) Timer Enable Jumper

Fault resilient booting insures the system will not stop from a boot
problem. Two sets of timers are implemented that will automatically
reset the system if the system should halt for some reason.
FRB 2 - 5 sec timer. If the primary processor does not come up in 5
!
seconds the system will automatically reset and switch to the
secondary processor secondary (if installed otherwise it will try to
boot again off of the primary.)
FRB 3 - 7 minute timer. If the system does not make it up to the end
!
of POST in 7 minutes, the system will automatically reset and try
again. It is assumed that the processor failed regardless of what may
have caused the system to hang. The primary processor is taken off
line and the system will boot off the secondary (if installed otherwise
it will try to boot again off of the primary.) Bad memory or a bad plug
in card may cause a FRB 3 failure.
3-30 Configuring Your System
! CAUTION
! CAUTION