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dargosch
Tux's lil' helper
Joined: 21 Aug 2003
Posts: 101
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 Posted: Fri Feb 02, 2007 12:09 pm Post subject: How do I create serial devices automatically? |
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Hi,
I have a problem with automatically creating serial port devices. I used to have this problem:
| Code: |
theodor dev # ls ttyS* -al
lrwxrwxrwx 1 root root 5 26 jan 09.09 ttyS0 -> tts/0
lrwxrwxrwx 1 root root 5 26 jan 09.09 ttyS1 -> tts/1
lrwxrwxrwx 1 root root 5 26 jan 09.09 ttyS2 -> tts/2
lrwxrwxrwx 1 root root 5 26 jan 09.09 ttyS3 -> tts/3
theodor dev # ls tts/* -al
lrwxrwxrwx 1 root root 8 26 jan 09.09 tts/0 -> ../ttyS0
lrwxrwxrwx 1 root root 8 26 jan 09.09 tts/1 -> ../ttyS1
lrwxrwxrwx 1 root root 8 26 jan 09.09 tts/2 -> ../ttyS2
lrwxrwxrwx 1 root root 8 26 jan 09.09 tts/3 -> ../ttyS3
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which is no good for syncing my old serial palm pilot. Now, I have found that I may correct the situation by doing this:
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theodor ~ # rm /dev/tts/0
theodor ~ # /bin/mknod /dev/tts/0 c 4 64
theodor ~ # chmod 777 /dev/tts/0
theodor ~ # ls -al /dev/pilot0 /dev/tts/* /dev/ttyS*
lrwxrwxrwx 1 root root 5 2 feb 08.44 /dev/pilot0 -> ttyS0
crwxrwxrwx 1 root root 4, 64 2 feb 11.50 /dev/tts/0
lrwxrwxrwx 1 root root 8 2 feb 08.44 /dev/tts/1 -> ../ttyS1
crwxrwxrwx 1 root root 4, 64 30 jan 11.58 /dev/tts/10
lrwxrwxrwx 1 root root 8 2 feb 08.44 /dev/tts/2 -> ../ttyS2
lrwxrwxrwx 1 root root 8 2 feb 08.44 /dev/tts/3 -> ../ttyS3
lrwxrwxrwx 1 root root 5 2 feb 08.44 /dev/ttyS0 -> tts/0
lrwxrwxrwx 1 root root 5 2 feb 08.44 /dev/ttyS1 -> tts/1
lrwxrwxrwx 1 root root 5 2 feb 08.44 /dev/ttyS2 -> tts/2
lrwxrwxrwx 1 root root 5 2 feb 08.44 /dev/ttyS3 -> tts/3
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Now everything works, and kpilot happily reports that
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11:49:50 Trying to open device /dev/pilot0...
11:49:50 Device link ready.
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and I can sync. Now, the problem is.. how do I do this in UDEV? I'll need to
- Create the device node at /dev/tts/0
- Change the permissions so that it is writable
How do I do this?
/Fredrik
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My Gentoo + PVR-350 + IVTV + MythTV blog is on
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bunder
Bodhisattva
Joined: 10 Apr 2004
Posts: 5947
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| Posted: Fri Feb 02, 2007 12:24 pm Post subject: |
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do you have any ttyUSB entries in dev? you might want to try those... but in any case the file you want is /etc/udev/rules.d/50-rules-something-or-other... and you'll want to make it have either users group permission or usb users group, and add yourself to the appropriate group.
cheers
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dargosch
Tux's lil' helper
Joined: 21 Aug 2003
Posts: 101
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| Posted: Fri Feb 02, 2007 12:30 pm Post subject: |
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| bunder wrote: | do you have any ttyUSB entries in dev? you might want to try those... but in any case the file you want is /etc/udev/rules.d/50-rules-something-or-other... and you'll want to make it have either users group permission or usb users group, and add yourself to the appropriate group.
cheers |
Thank you for your quikc reply.
However, I fail to see what USB has to do with it? Do you mean to say that the old-school serial ports have been misstaken for USB ports?
/Fredrik
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Registered Linux user #163029 http://counter.li.org/
My Gentoo + PVR-350 + IVTV + MythTV blog is on
http://gentoomythtv.blogspot.com/ |
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_MacBaum_
n00b
Joined: 15 Oct 2006
Posts: 17
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| Posted: Fri Feb 02, 2007 1:33 pm Post subject: |
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You can somehow (somehow is depending on your udev-version) create nodes automatically with VendorID and ProductID (get ids with lsusb)
or Bus-topology (does the Palm somehow identify himself as a "unique item"?).
I want to write some rules to fix my USB-Devices to constant nodes.
Perhaps this helps:
http://www.reactivated.net/writing_udev_rules.html
Last edited by _MacBaum_ on Fri Feb 02, 2007 1:36 pm; edited 1 time in total |
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_MacBaum_
n00b
Joined: 15 Oct 2006
Posts: 17
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| Posted: Fri Feb 02, 2007 1:36 pm Post subject: |
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Note to self: Learn to klick the mouse.
Please delete. |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Fri Feb 02, 2007 1:50 pm Post subject: |
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| dargosch wrote: | | old-school serial ports |
That makes it a bit more interesting. Here's my USB Palm setup.
I expect that udev "wakes up" and creates the devices only during a hotsync, as with USB. So, put udev into debugging mode and check its logs. |
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_MacBaum_
n00b
Joined: 15 Oct 2006
Posts: 17
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| Posted: Fri Feb 02, 2007 1:56 pm Post subject: |
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| PaulBredbury wrote: |
I expect that udev "wakes up" and creates the devices only during a hotsync, as with USB. So, put udev into debugging mode and check its logs. |
Try udevstart |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Fri Feb 02, 2007 2:07 pm Post subject: |
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| _MacBaum_ wrote: | | Try udevstart |
Why? Udev is always running as a daemon. The intention is to notice the Palm in udev's logs, so that a udev rule for it can be written. |
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bunder
Bodhisattva
Joined: 10 Apr 2004
Posts: 5947
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| Posted: Fri Feb 02, 2007 11:59 pm Post subject: |
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| dargosch wrote: | | bunder wrote: | do you have any ttyUSB entries in dev? you might want to try those... but in any case the file you want is /etc/udev/rules.d/50-rules-something-or-other... and you'll want to make it have either users group permission or usb users group, and add yourself to the appropriate group.
cheers |
Thank you for your quikc reply.
However, I fail to see what USB has to do with it? Do you mean to say that the old-school serial ports have been misstaken for USB ports?
/Fredrik |
i believe they use the same driver. the s in usb does stand for serial. 
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| Neddyseagoon wrote: | | The problem with leaving is that you can only do it once and it reduces your influence. |
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