Sun Microsystems Sun Fire V490 - Manual (Page 65)

Chapter 3 Hardware Configuration 37
FIGURE 3-6 Hardware Jumpers on PCI Riser Board
The functions of the PCI riser board jumpers are shown in TABLE 3-3 .
Each jumper on the PCI riser board has two options, as described in the following
list.
■ J1102 – Labeled “CS” on the PCI riser board, this jumper is used to select the Boot
PROM device. In the default position with the shunt covering pins 1 and 2, the
system boots the OpenBoot flash PROM on the centerplane. In the other position,
the system boots by way of an optional debug device that populates the connector
at location J1101.
TABLE 3-3 PCI Riser Board Jumper Functions
Jumper Shunt on Pins 1 + 2 Selects Shunt on Pins 2 + 3 Selects Default Setting
OpenBoot flash PROM Optional debug device
populating connector in
position J1101 1 + 2
Reserved for future use Reserved for future use 1 + 2
OpenBoot flash PROM
Write-enabled OpenBoot flash PROM
Write-protected 1 + 2
J1102
J1104
J1103
J1102
3 2 1
J1103
3 2 1
J1104
3 2 1