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114 Sun Fire 280R Server Owner’s Guide • January 2001
About Flash Permanent Read Only
Memory (PROM) Jumpers
The system uses flash PROM jumpers to permit the reprogramming and use of
specific boot code blocks that are held in nonvolatile (NVRAM) system memory, and
to permit remote reprogramming of that code by an authorized system
administrator over a local area network.
One jumper on the main logic board controls flash PROM operation. The table below
describes its function.
Modifying the jumper setting should only be performed by a qualified service
provider. For the location of the flash PROM jumper on the main logic board, and for
configuration instructions, see the Sun Fire 280R Server Service Manual.
Note – The jumper setting on J2104 must remain on its factory-supplied setting
(shunt on pins 1 and 2).
For information about how jumpers are marked on the main logic board with
jumper addresses, see “About the Main Logic Board Jumpers” on page 112.
For more information about flash PROM programming, see the Sun Fire 280R Server
Service Manual.
Jumper
Shunt on
Pins 1 + 2 Selects
Shunt on
Pins 2 + 3 Selects
Default
Shunt
on Pins
Signal
Controlled
J2103 Write protect Write enable 1 + 2 FLASH PROM
PROG ENABLE