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Old 10-23-2005, 09:40 PM   #1
Registered: Mar 2005
Posts: 124

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does udev make /dev/ttyS0 ?

I am having problems making /dev/ttyS0 during startup. The physical device exists and the bios monitor reports it operational.

Where in the boot process is /dev/ttyS0 made?

udev is active and appears to make several devices. However I cannot determine exactly what it is doing.

Is udev supposed to make /dev/ttyS0?

Thanks, Dan
Old 10-23-2005, 10:58 PM   #2
Senior Member
Registered: Jun 2004
Posts: 2,553

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I'm no expert on this by a long shot bt udev is suposed to be using the info in your sysfs
you got sysfs mounted in /etc/fstab ?
sysfs          /sys         sysfs  defaults        0     0
this should result in the kernel making a directory
it should hhave a file in it named dev with the major and minor device numbers

should be able to type
udevinfo -q path -n ttyS0
and get

perhaps we can go from here and diagnose further
Old 10-23-2005, 11:16 PM   #3
Registered: Mar 2005
Posts: 124

Original Poster
Rep: Reputation: 15
Thank you - great help. On one system where it works the result is as expected. On the other that fails it is:

device not found in database

This yields the question "what database".

There are files in "/etc/makedev.d" and one of those calls for ttyS0 however that device is not being created.

What portion of the boot process should create that device?
Is there a log entry and which one?

Thanks, Dan


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