On 11/12/2014 6:21 AM, Terje Froysa wrote: > > Everything seem correct. > But the UARTs are now occupied by the omap_serial driver. > According to Xenomai (http://xenomai.org/serial-16550a-driver/) the driver > should be disabled by the setserial command. > I can't get this command working. It reports the serial port but changing > it results in error (regardless of the ttyO -number): > debian@beaglebone:~$ setserial /dev/ttyO2 > /dev/ttyO2, UART: undefined, Port: 0x0000, IRQ: 74 > > debian@beaglebone:/boot$ sudo setserial /dev/ttyO2 uart none > Cannot set serial info: *Invalid argument* > Consequently, I cannot load the xeno_16550A.ko module. > I have browsed the net for the same problem, but have not found relevant > subjects. > There are no shared irq's in my problem (closest subject I found). > > Do you have any idea for a solution?
I _think_ the problem may be that if you don't enable the serial port in the device-tree than Xenomai encounters a bus error when accessing the address range (not entirely unexpected, since the UART's clock is probably turned off). But if you enable the UART in the device tree, Linux takes control of the port and Xenomai can't access it. Other than asking for advice on the Xenomai list, you might try booting with the Xenomai kernel and a device tree that _disables_ the UART you're trying to use. I would expect trying to load the xeno_16550A module to fail (as it does when you boot the kernel with the module enabled), but you should be able to manually setup the required low-level hardware configuration at which point you ought to be able to load the driver. Or in other words, I think you need to perform the hardware setup from the TI UART driver prior to loading the Xenomai serial driver. -- Charles Steinkuehler [email protected] -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
