See also CPU_ELAN(4) and led(4).
| option | status | explanation | |
|---|---|---|---|
| options CPU_ELAN | mandatory |
The ElanSC520 cpu has a number of quirks that needs to be worked around, in particular the i8254 timer ticks at a non-standard rate of 1189161Hz.
|
|
| options CPU_SOEKRIS | recommended |
This option sets things up for the soekris board. Amongst other things, this makes /dev/led/error appear. |
|
| options HZ=150 | recommended |
It is necessary to increas HZ to at least 150 in order to take advantage of the "ELAN" timecounter. |
|
| options CPU_ELAN_XTAL | optional |
Some early revisions of the soekris boards have a CPU xtal on a frequency different from 33333333Hz. You can set the frequency with this option if you need to. You can also configure it at runtime with the sysctl machdep.elan_freq. | |
| options CPU_ELAN_PPS | optional |
Enable support for precision timestamping of an external signal. See this page. |
| option | status | explanation |
|---|---|---|
| options CPU_ELAN | mandatory |
The ElanSC520 cpu has a number of quirks that needs to be worked around, in particular the i8254 timer ticks at a non-standard rate of 1189161Hz.
|
| options HZ=150 | recommended |
It is necessary to increas HZ to at least 150 in order to take advantage of the "ELAN" timecounter. |