Hi all, Not sure this is really the right place, but I've been stuck with this problem for a while now, and seems like there are a lot of people on this list who work with the serial stuff.. If this is not the place to discuss this type of issue, can someone help me to the right place ? There aren't many places discussing serial port stuff it seems, and on most forums, if there is some serial port stuff, it will be for normal desktop linuxes, where this works without problems... I'm trying to develop an application to work with serial infra-red module, but I'm having difficulties to even get my module started. My HW is Beagleboard, which has 1 UART serial port, normally used for console, which I have disabled (I re-created the boot.scr, without the console arguments), and I have modified the getty config, not to try to attach to ttyO2. On 3.x omap kernels, the serial port is now called ttyOx instead of ttySx, though I guess that doesn't really matter ? I guess the port and irq are the most important things During boot, I can see following information regarding the configuration: [ 0.000000] Kernel command line: console=tty0 root=/dev/mmcblk0p2 rootwait ro vram=12MB omapfb.mode=dvi:1280x720MR-16@ 60 fixrtc buddy=none mpurate=auto [ 0.000000] console [tty0] enabled [ 0.768524] omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 72) is a OMAP UART0 [ 0.768768] omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 73) is a OMAP UART1 [ 0.769012] omap_uart.2: ttyO2 at MMIO 0x49020000 (irq = 74) is a OMAP UART2 [ 0.769226] omap_uart.3: ttyO3 at MMIO 0x49042000 (irq = 80) is a OMAP UART3 When system tries to load the lirc module (for infra-red) I get this complain about IRQ being busy: [ 12.396392] lirc_serial: IRQ 74 busy Now, I'm not sure now why that is still happening, as I think nobody should be connected to ttyO2 anymore. But anyway, around internet people say I should release the UART manually, and I try it with setserial, with strange reply: ubuntu@omap:/etc$ sudo setserial /dev/ttyO2 uart none Cannot set serial info: Invalid argument If I try without sudo, I get "Permission denied" Also strangely, when I try to look at the port status: ubuntu@omap:/etc$ sudo setserial -g /dev/ttyO[0-3] /dev/ttyO0, UART: undefined, Port: 0x0000, IRQ: 72 /dev/ttyO1, UART: undefined, Port: 0x0000, IRQ: 73 /dev/ttyO2, UART: undefined, Port: 0x0000, IRQ: 74 /dev/ttyO3, UART: undefined, Port: 0x0000, IRQ: 80 Shoudn't there be something in those port addresses ? Does it matter that "MMIO" is used ? Normally IO port seems to be indeed 0x**** format, now the address for serial port is much higher (0x********) Thanks, Juha -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
