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LinuxCNC Parallel Port Error - Unknown symbol in module

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9 years 10 months ago #84912 by GingerPhil
LinuxCNC Parallel Port Error - Unknown symbol in module was created by GingerPhil
Good afternoon!

This is my first post, hopefully there is no other like it. I have been playing around trying to get LinuxCNC to work on an old PC with a motherboard parallel port. However I am having some problems with the parallel port!

After using StepConf to setup the machine, I first get the error:
Code:
Error: could not insert module /usr/realtime-3.4-9-rtai-686-pae/modules/linuxcnc/hal_parport.ko: Device or resource busy

Which I believe isn't uncommon, however after ending lp, Ppdev, and parport_pc, a new error appears that I have not come across before:
Code:
Error: could not insert module /usr/realtime-3.4-9-rtai-686-pae/modules/linuxcnc/hal_parport.ko: Unknown symbol in module

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9 years 10 months ago #84913 by andypugh
Replied by andypugh on topic LinuxCNC Parallel Port Error - Unknown symbol in module
What do you see in the last 20 lines of so of the output of the "dmesg" command?

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9 years 10 months ago #84915 by GingerPhil
Replied by GingerPhil on topic LinuxCNC Parallel Port Error - Unknown symbol in module
Code:
[ 753.383326] RTAI[sched]: timer setup = 999 ns, resched latency = 2943 ns. [ 753.401813] RTAI[math]: loaded. [ 753.552178] hal_parport: Unknown symbol parport_register_device (err 0) [ 753.552209] hal_parport: Unknown symbol parport_release (err 0) [ 753.552229] hal_parport: Unknown symbol parport_claim (err 0) [ 753.552251] hal_parport: Unknown symbol parport_unregister_device (err 0) [ 753.552270] hal_parport: Unknown symbol parport_find_number (err 0) [ 753.552301] hal_parport: Unknown symbol parport_find_base (err 0) [ 753.552322] hal_parport: Unknown symbol parport_put_port (err 0) [ 754.054050] RTAI[math]: unloaded. [ 754.057632] SCHED releases registered named ALIEN PEDV$D [ 754.068963] RTAI[malloc]: unloaded. [ 754.168047] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0). [ 754.171609] I-pipe: head domain RTAI unregistered. [ 754.171697] RTAI[hal]: unmounted.

I presume this is what you are after?

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9 years 10 months ago - 9 years 10 months ago #84916 by ArcEye
Replied by ArcEye on topic LinuxCNC Parallel Port Error - Unknown symbol in module
You need to have parport loaded, to supply the base access functions.
The errors in dmesg suggest it is not loaded.

Before you start linuxcnc, open a terminal and do
$ lsmod

You should have parport loaded, but not lp or ppdev or parport_pc

If it is not loaded then do
$ sudo modprobe parport

If it is loaded and so are the other modules as above then do
$ sudo rmmod parport_pc && sudo rmmod ppdev && sudo rmmod lp

Then try running linuxcnc .

I have had this problem with some kernels previously, where if you blacklist lp and / or parport_pc, udev decides that there is no need for parport either and does not load it.
Last edit: 9 years 10 months ago by ArcEye.

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9 years 10 months ago - 9 years 10 months ago #84917 by GingerPhil
Replied by GingerPhil on topic LinuxCNC Parallel Port Error - Unknown symbol in module

ArcEye wrote: I have had this problem with some kernels previously, where if you blacklist lp and / or parport_pc, udev decides that there is no need for parport either and does not load it.


I think that is what has happened, parport has not been loaded as a result of ppdev, parport_pc and lp not being there.

However if I load parport and then check only parport is loaded with $ lsmod, I still get the original error:
Code:
Error: could not insert module /usr/realtime-3.4-9-rtai-686-pae/modules/linuxcnc/hal_parport.ko: Device or resource busy

with dmesg showing:
Code:
[ 7411.417163] RTAI[math]: loaded. [ 7411.567424] config string 'configuration string' [ 7411.570138] PARPORT: ERROR: request_region(0xffff) failed [ 7412.065364] RTAI[math]: unloaded. [ 7412.069109] SCHED releases registered named ALIEN PEDV$D [ 7412.079870] RTAI[malloc]: unloaded. [ 7412.176047] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0). [ 7412.179559] I-pipe: head domain RTAI unregistered.
Last edit: 9 years 10 months ago by GingerPhil. Reason: wrong quote

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9 years 10 months ago #84919 by GingerPhil
Replied by GingerPhil on topic LinuxCNC Parallel Port Error - Unknown symbol in module
Scrap that I had a strange stuff in the .hal in an attempt to fix it earlier - after rerunning stepconf I get:
Code:
Error: could not insert module /usr/realtime-3.4-9-rtai-686-pae/modules/linuxcnc/hal_parport.ko: No such device

A new error!
Code:
[ 7411.404993] RTAI[sched]: timer setup = 999 ns, resched latency = 2944 ns. [ 7411.417163] RTAI[math]: loaded. [ 7411.567424] config string 'configuration string' [ 7411.570138] PARPORT: ERROR: request_region(0xffff) failed [ 7412.065364] RTAI[math]: unloaded. [ 7412.069109] SCHED releases registered named ALIEN PEDV$D [ 7412.079870] RTAI[malloc]: unloaded. [ 7412.176047] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0). [ 7412.179559] I-pipe: head domain RTAI unregistered. and [ 8346.985411] RTAI[sched]: timer setup = 999 ns, resched latency = 2944 ns. [ 8346.997155] RTAI[math]: loaded. [ 8347.211470] config string '0 out' [ 8347.214257] PARPORT: ERROR: linux parport 0 not found [ 8349.836303] RTAI[math]: unloaded. [ 8349.840323] SCHED releases registered named ALIEN PEDV$D [ 8349.850123] RTAI[malloc]: unloaded. [ 8349.948042] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0).

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