Spectris Arcom VIPER Quick Start Manual page 23

VIPER RedBoot and AEL Quickstart
•
The 'powersave' governor selects the lowest available frequency from the available
powersave frequencies.
•
The 'userspace' governor allows direct userspace selection of a frequency from the
available performance frequencies.
The default is to use the performance governor with a maximum frequency of 400MHz.
The powersave and userspace governors are supplied as loadable kernel modules,
called cpufreq_powersave and cpufreq_userspace respectively. They may be loaded
using the modprobe command.
The available performance clock rates are listed in the following table. They correspond
to the modes available when the turbo mode multiplier, CCCR[N] is 1.0.
Clock speed
(KHz)
99532
132710
199065
265421*
331776*
398131*
* Not available on 200MHz VIPER-LITE.
The available powersave clock rates are listed in the following table:
Clock speed
(KHz)
99532
199065
298598*
398131*
* Not available on 200MHz VIPER-LITE.
© 2005 Arcom Issue D
Core Clock Memory clock
Configuration (MHz)
Register
(L, M and N
multipliers)
27, 1, 1.0 99
36, 1, 1.0 133
27, 2, 1.0 99
36, 2, 1.0 133
45, 2, 1.0 166
27, 4, 1.0 99
Core Clock Memory clock
Configuration (MHz)
Register
(L, M and N
multipliers)
27, 1, 1.00 99
27, 1, 2.00 99
27, 1, 3.00 99
27, 2, 2.00 99
Arcom Embedded Linux (AEL)
Run clock Turbo clock
(MHz) (MHz)
99 99
133 133
199 199
265 265
332 332
398 398
Run clock Turbo clock
(MHz) (MHz)
99 99
99 199
99 299
199 398
PX bus (MHz)
50
66
99
133
166
196
PX bus (MHz)
50
50
50
99
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