Appendix C
Functional Description
C-11
C.4.2
OpenBoot PROM Jumpers: CPU Speed Selection
When the system is powered on, the CPU clock speed is determined by the default
hardware settings (200MHz) of the MC12429. The OpenBoot PROM firmware will
then need to know the exact CPU speed so that the OpenBoot PROM can reprogram
the MC12429 accordingly through the OpenBoot PROM serial programming
interface. The CPU speeds and jumper settings will be provided in the CPU release
notes.
C.5
Power Control
C.5.1
Power Switch
The Sun Blade 100 system power on/off button is on the front panel.
TABLE C-2
CPU Speed Jumpers Setting
Jumper Settings
CPU Speed (MHz)
All open
A (current CPU default)
1-2 closed
B
3-4 closed
C
1-2, 3-4 closed
D
5-6 closed
E
1-2, 5-6 closed
F
3-4, 5-6 closed
G
1-2, 3-4, 5-6 closed
H
TABLE C-3
Spare OpenBoot PROM configuration
EGPIO[12:11]
TBD
00
TBD
01
TBD
10
TBD
10
TBD
Summary of Contents for Sun Blade 100
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Page 170: ...A 8 Sun Grover Service Manual October 2000...