The flash PROM update procedure for the Sun Enterprise 450 and the Ultra 450 systems assumes that the write-protect/enable jumper was set in the default position (enabled). In order to update the flash PROM, you must move the write-protect/enable jumper to the write-enable position.
Three jumpers on the main logic board affect flash PROM operation. Figure 4-8 shows the jumper locations, and Table 4-6 describes their functions.
Jumper |
Pins 1 + 2 Jumpered |
Pins 2 + 3 Jumpered |
Default on Pins |
Signal Controlled |
---|---|---|---|---|
J3102 |
Flash PROM |
Not to be used |
1 + 2 |
FLASH PROM SEL |
J3103 |
Write-protect |
Write-enable |
2 + 3 |
FLASH PROM PROG ENABLE |
J5501 |
High-half booting |
Low-half booting |
2 + 3 |
XOR LOGIC SET |
Make sure that the write-protect/write-enable jumper is set to the write-enable position, pins 2 and 3 jumpered (see Figure 4-9). Pin 1 is noted by an asterisk (*).