We are running hard RT and soft RT process under realtime OS Timesys Linux on the industrial PC. Hard RT process has a 1 milisecond period and soft RT runs with 300 milisecond period.
The Soft RT process is accessing the serial RS422 port and the driver used is the Linux serial driver. (We have an RS422 card and the driver is slightly modified by the manufacturer, but it is based on the Linux driver).
The serial communication affects hard RT process performance which results in its overruns. We suspect that the problem is in the serial communication driver - either the interrupt routine is not preemptible or the problem is that it uses jiffies or something else.
Does anyone know if there is a real-time serial driver available? Did anyone have experience with Timesys Linux?
Thanks in advance.
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