SYnth

Show synthesizer frequency

SYnth

Shortest form: sy.

Show or set the frequency of a reference board’s clock synthesizer: synth prints Synth Freq = <f> MHz, synth <MHz> changes it (Change from <f> MHz to <f> MHz; out-of-range values print the valid range).

This is a utility for Broadcom reference boards. It talks to a named device in the SDK’s I2C device table, on the I2C bus of the switch chip itself. On a SONiC switch the platform’s fans, sensors, EEPROMs and optics are normally handled by the platform drivers on the CPU’s own I2C buses, so the device is usually missing and the command prints SYnth: cannot open I2C device lpt4: …. It also uses lpt5.

Unvalidated

drivshell> synth

Built-in help

synth [value]
   - show synth freq, if value specified, set frequency.