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Chapter 4 Hardware Configuration 83
About Flash PROM Jumpers
The system uses flash PROMs to permit the reprogramming and use of specific boot
code blocks that are held in non-volatile system memory, and to permit remote
reprogramming of that code by an authorized system administrator over a local area
network.
Two jumpers on the main logic board affect flash PROM operation. The table below
describes their function.
For more information about flash PROM programming, see the documentation
supplied with the flash PROM update CD-ROM.
For information about how jumpers are marked on the main logic board with
jumper addresses, see “About the Main Logic Board Jumpers” on page 81.
Modifying jumper settings can only be performed by a qualified service provider.
For the locations of the flash PROM jumpers on the main logic board, and for
configuration instructions, see the Sun Enterprise 220R Server Service Manual.
Jumper
Shunt on
Pins 1 + 2 Selects
Shunt on
Pins 2 + 3 Selects
Default
Shunt
on Pins
Signal
Controlled
J2703 Write protect Write enable 1 + 2 FLASH PROM
PROG ENABLE
J
2804 High-half booting Normal (Low-half)
booting
2 + 3 XOR LOGIC SET