Hi List, I am using linux 2.6.22 on a MPC8358E custom board.
I use a simple userspace process that periodically (100 ms) calls an ioctl to a watchdog driver to toggle its pin state. The problem is that when I insert or remove the Ethernet cable, this process is not scheduled for execution. The watchdog IC resets the board if a pulse is not received in 1.2 seconds. I am clueless as to where to look in - the vitesse (PHY) driver or the ucc_geth driver or the kernel scheduler. I have tried modifying the priority of the process but there are no changes to this behavior. Then I wrote another driver that uses a kernel timer, that periodically (100 ms) toggles the pin state. In this case, I have observed on an oscilloscope that the pulses are regular even when the Ethernet cable is inserted or removed. It means that the kernel itself is not in a waiting state when the cable is inserted or removed but *however* (as per my observations) it does not schedule all userspace processes for the next 1 - 2 seconds. Well, ofcourse an alternate solution to implementing the watchdog on my board would be to toggle the watchdog pin using a kernel timer. But, Why the userspace process is not getting its time share to execute? Please throw some light as to where to look? Is this issue known or could it be my board-specific? Thanks, Elison _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev