Arch Linux

casacristo

Member

Registered: 2011-09-29

Posts: 10

trouble with ttyS0 and ttyS1

I can not get the lirc_serial module to load

Running kernel 3.0.8

    /usr/bin/setserial /dev/ttyS0 uart none
    /usr/bin/setserial /dev/ttyS1 uart none
    /sbin/modprobe lirc_serial

Results in:

FATAL: Error inserting lirc_serial (/lib/modules/3.0.8-ARCH/kernel/drivers/staging/lirc/lirc_serial.ko): Device or resource busy

modinfo lirc_serial | grep irq

parm:           irq:Interrupt (4 or 3) (int)
parm:           share_irq:Share interrupts (0 = off, 1 = on) (bool)

I googled but everybody tells you to fix it using setserial yet it does not work.
The problem  occurs for both ttyS0 and ttyS1 (with ttyS0 the busy IRQ is 4)

In DSMEG I see:

[  515.065475] lirc_dev: IR Remote Control driver registered, major 252 
[  515.066251] lirc_serial: module is from the staging directory, the quality is unknown, you have been warned.
[  515.078414] lirc_serial: IRQ 3 busy
[  616.022858] lirc_serial: bad vermagic: kernel tainted.
[  616.022881] Disabling lock debugging due to kernel taint

cat /proc/interrupts

           CPU0       
  0:    2395202    XT-PIC-XT-PIC    timer
  1:          2    XT-PIC-XT-PIC    i8042
  2:          0    XT-PIC-XT-PIC    cascade
  3:          0    XT-PIC-XT-PIC    
  4:          2    XT-PIC-XT-PIC  
  6:          1    XT-PIC-XT-PIC  
  7:          1    XT-PIC-XT-PIC  
  8:          0    XT-PIC-XT-PIC    rtc0
  9:          1    XT-PIC-XT-PIC  
 10:      20825    XT-PIC-XT-PIC    ehci_hcd:usb1
 11:     184892    XT-PIC-XT-PIC    uhci_hcd:usb4, VIA8233
 12:          0    XT-PIC-XT-PIC    uhci_hcd:usb3
 14:       9207    XT-PIC-XT-PIC    pata_via
 15:    2546714    XT-PIC-XT-PIC    uhci_hcd:usb2, pata_via, yenta, cx88[0], cx88[0], eth0
NMI:          0   Non-maskable interrupts
LOC:          0   Local timer interrupts
SPU:          0   Spurious interrupts
PMI:          0   Performance monitoring interrupts
IWI:          0   IRQ work interrupts
RES:          0   Rescheduling interrupts
CAL:          0   Function call interrupts
TLB:          0   TLB shootdowns
TRM:          0   Thermal event interrupts
THR:          0   Threshold APIC interrupts
MCE:          0   Machine check exceptions
MCP:          0   Machine check polls
ERR:          0
MIS:          0

Last edited by casacristo (2011-11-07 10:09:39)

student975

Member

From: Russian Federation

Registered: 2011-03-05

Posts: 613

Re: trouble with ttyS0 and ttyS1

Have you lircd in your services list in /etc/rc.conf? I have removed it and added

/usr/bin/setserial /dev/ttyS0 uart none
/sbin/modprobe lirc_serial
/etc/rc.d/lircd start

to /etc/rc.local - all works fine for me.

---

"I exist" is the best myth I know..

yoshi

Member

Registered: 2008-07-21

Posts: 17

Re: trouble with ttyS0 and ttyS1

same problem here, did you solve this?

casacristo

Member

Registered: 2011-09-29

Posts: 10

Re: trouble with ttyS0 and ttyS1

I removed references to UART in the kernel config and then no more errrors but alas no more /dev/ttyS0 or ttyS1 either

Still the lirc_serial module was able to create /dev/lirc0 after this even without ttyS0 or ttyS1

So not a very elegant solution in short