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Full Discussion: setserial not working on linux running on Beagleboard (ARM development board)
Top Forums UNIX for Dummies Questions & Answers setserial not working on linux running on Beagleboard (ARM development board) Post 302569229 by julumme on Sunday 30th of October 2011 10:15:37 AM
Old 10-30-2011
setserial not working on linux running on Beagleboard (ARM development board)
Hi,

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:
Code:
[    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:
Code:
[   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:
Code:
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:
Code:
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********)

Any ideas how I should proceed ?
Last edited by julumme; 10-30-2011 at 11:16 AM.. Reason: -
 

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LEARN ABOUT OSF1

dc

dc(7)							 Miscellaneous Information Manual						     dc(7)

NAME

       dc - serial line/mouse/keyboard

SYNOPSIS

       controller   dc0   at ibus0   slot 0   vector dcintr

DESCRIPTION

       The  dc	serial	line controller provides DECstation 2100, DECstation 3100, DECstation 5000, and DECstation 5100 computer systems with key-
       board, mouse, and serial communications interfaces. The serial communications interfaces on the DECstation 2100 and DECstation 3100 provide
       partial	modem  control.  The  serial communications interfaces on the DECstation 5000 provide full modem control.  The device special file
       /dev/tty01 on a DECstation 5100 provides full modem control, while the remaining ports provide no modem control at all.	All serial  commu-
       nications interfaces operate at baud rates from B50 to B9600, excluding B200.

       The  dc	ports  are  used as follows: Usage Graphics device keyboard at 4800 BPS Mouse or tablet at 4800 BPS Communications port 1 (w/modem
       control)/local terminal Communications port 2 (w/modem control)/local terminal

       On all systems except the DECstation 5100, serial port 2 is used for the system console port in server (that is,  non-graphics)	configura-
       tions.  On DECstation 5100s, the serial port labeled 3 on the back of the system is always the system console port.  The serial system con-
       sole port always operates at 9600 BPS, 8-bits, no parity; modem control is not supported.

RESTRICTIONS

       Data communications equipment attached to the console serial port in server configurations must be set to 9600 BPS, 8-bits, no parity.  The
       scc driver enforces this restriction.

FILES

       console terminal local terminal local terminal local terminal (DECstation 5100 only)

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	     dc(7)
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