Q: How do I read and change the Clock Speed on the DM3730, AM3703 Development Kit?
A:
In LogicLoader (LoLo):
In the Logicloader Command Description manual, (ver2.5 – 1020108A)
To change the cpu-freq command has three settings
losh> cpu-freq [high|nominal|low]
To read the cpu-freq:
losh> cpu-freq
For Linux and Android:
(Reference: WP491—DM3730-AM3703_Torpedo_SOM_Thermal_Management; 1021014A)
Section 4.1.2:
4.1.2 Linux and Android
Linux provides several tools to change the DM3730/AM3703 OPPs. Changing the frequency with these tools also sets the correct core voltages. The /sys/devices/system/cpu/cpu0/cpufreq directory has several parameters for setting up frequency scaling.
To read back the current frequency, use one of the two commands below.
host$ cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
host$ cpufreq-info -f -m
To read back available options for setting the CPU frequency, use the command below.
host$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
To manually set the CPU frequency, use the command below, where X is the frequency in kHz. Options are given by the previous command listed.
host$ cpufreq-set -f X
The example below uses this command to set the frequency to 1 GHz.
host$ cpufreq-set -f 1000000
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Note: Several of the value entries above are in KHz. The processor hardware is degraded if running at high speed >800MHz for an extended period of time. The software does not
have frequency limitations.
Sidenote:
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To include cpufrequtils in a build, the DM37x Linux BSP UG (1020203A) Section 2.2.1.2 has the following command:
bash$ sudo apt-get install libtool
PRODUCTS Included:
DM3730, AM3703, DM3730 Torpedo, DM3730 Torpedo + Wireless
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