Sun Microsystems 220R manual About Flash PROM Jumpers

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.

			Default
	Shunt on	Shunt on	Shunt	Signal
Jumper	Pins 1 + 2 Selects	Pins 2 + 3 Selects	on Pins	Controlled
J2703	Write protect	Write enable	1 + 2	FLASH PROM
				PROG ENABLE
J2804	High-half booting	Normal (Low-half)	2 + 3	XOR LOGIC SET
		booting

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.

Chapter 4 Hardware Configuration 83