Sun Microsystems 280R About Flash Permanent Read Only Memory (PROM) Jumpers

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
specificboot 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.
Onejumper 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 page112.
For more information about flash PROM programming, see the Sun Fire 280R Server
Service Manual.
Jumper Shunton Pins1 + 2 Selects Shunton Pins2 + 3 Selects
Default
Shunt
onPins Signal Controlled
J2103 Writeprotect Writeenable 1 + 2 FLASHPROM
PROG ENABLE