how to use udev
could somebody explain to me please how to use this udev thing i've compiled and installed udev-012 and hotplug-2003_08_05 udev documentaion says "Add and remove devices from the system and marvel as nodes are creaed and removed in /udev/ based on the device types" so how do I add devices? Do I have to call "mknod" or just calling "modprobe" to load a give device module would be enough? I mean neither seems to work, I get absolutely nothing in /dev/ or /udev/ ??? Am I missing something here???
PS proc and sysfs are both mounted on /proc and /sys, I have some entries in /proc and /sys but that's about it, nothing in /dev or /udev
Cheers for your help
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Quoted 8 lines · Roman Duka
could somebody explain to me please how to use this udev thing i've compiled and installed udev-012 and hotplug-2003_08_05 udev documentaion says "Add and remove devices from the system and marvel as nodes are creaed and removed in /udev/ based on the device types" so how do I add devices? Do I have to call "mknod" or just calling "modprobe" to load a give device module would be enough? I mean neither seems to work, I get absolutely nothing in
/dev/or /udev/ ??? Am I missing something here???
If you go into the test directory, after installing udev, and run the test.all script as root with the 'add' paramater:
test.all add
Do you see new nodes show up in /udev?
If not, something is not installed properly.
If there are nodes, great, it's working :)
thanks,
greg k-h
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Quoted 16 lines · Greg KH
Quoted 8 lines · Roman Duka
could somebody explain to me please how to use this udev thing i've compiled and installed udev-012 and hotplug-2003_08_05 udev documentaion says "Add and remove devices from the system and marvel as nodes are creaed and removed in /udev/ based on the device types" so how do I add devices? Do I have to call "mknod" or just calling "modprobe" to load a give device module would be enough? I mean neither seems to work, I get absolutely nothing in
/dev/or /udev/ ??? Am I missing something here???If you go into the test directory, after installing udev, and run the test.all script as root with the 'add' paramater:
test.all add
Quoted 6 lines
Do you see new nodes show up in /udev?
If not, something is not installed properly.
If there are nodes, great, it's working :)
No Greg I don't get anything in /udev the script calls udev and there are no error messages or anything, however /udev is still empty I need to ask you a few questions:
- I compiled udev on Linux running kenel 2.4.20, however I am trying to get udev working on kernel 2.6.0 which has support for hot-pluggable devices and module loading/unloading enabled. I don't think I need to be running kernel 2.6.0 in order to just compile udev, am I correct here??
- I didn't switch my system to kernel 2.6.0 and udev, I am trying to test it within initrd (Initial Ram Disk), so what I have is a subdirectory in my home directory, where I installed busybox, bash, insmod, modprobe, hotplug scripts and udev, plus the needed shared libraries in /lib. Note I installed udev with the following command "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the config files etc should be relative to the root directory, and I've checked them, they're fine. I created a initrd and put it on a CD-RW disk and that's what I am booting from and testing udev. My question is, does running udev withing initrd make any impact on its operations? May be the reason why it doesn't work for me is because it has some issues in initrd environment???
If nothing else, what else do you think could be wrong??
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Quoted 4 lines · Roman Duka
No Greg I don't get anything in /udev the script calls udev and there are no error messages or anything, however /udev is still empty I need to ask you a few questions:
Ick. You ran that as root, right?
Hm, try running the udev-test.pl script in that directory. Let us know if the tests there pass or not. They should.
Quoted 4 lines
- I compiled udev on Linux running kenel 2.4.20, however I am trying to get udev working on kernel 2.6.0 which has support for hot-pluggable devices and module loading/unloading enabled. I don't think I need to be running kernel 2.6.0 in order to just compile udev, am I correct here??
You are correct. You can build udev on any kernel. _but_ the test.all script will _not_ show anything in /udev if you are not on a 2.6.0 kernel. That's probably the problem.
The udev-test.pl script will work on any kernel, it uses its own fake sysfs tree.
Quoted 10 lines
- I didn't switch my system to kernel 2.6.0 and udev, I am trying to test it within initrd (Initial Ram Disk), so what I have is a subdirectory in my home directory, where I installed busybox, bash, insmod, modprobe, hotplug scripts and udev, plus the needed shared libraries in /lib. Note I installed udev with the following command "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the config files etc should be relative to the root directory, and I've checked them, they're fine. I created a initrd and put it on a CD-RW disk and that's what I am booting from and testing udev. My question is, does running udev withing initrd make any impact on its operations?
It shouldn't. You built the klibc version, right?
Quoted 2 lines
May be the reason why it doesn't work for me is because it has some issues in initrd environment???
Is sysfs mounted when udev is called? That's a requirement.
thanks,
greg k-h
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udev won't work if sysfs isn't mounted. from fstab...
none /sys sysfs defaults 0 0
Does your sysfs directory have a class directory? under the various classes do they have dev attributes? For example: /sys/class/tty/console/dev
Without these dev entries udev won't work. They should be automatically generated by the device drivers.
Quoted 35 lines · --- Roman Duka
Quoted 10 lines
If you go into the test directory, after installing udev, and run the test.all script as root with the 'add' paramater:
test.all addDo you see new nodes show up in /udev?
If not, something is not installed properly.
If there are nodes, great, it's working :)
No Greg I don't get anything in /udev the script calls udev and there are no error messages or anything, however /udev is still empty I need to ask you a few questions:
- I compiled udev on Linux running kenel 2.4.20, however I am trying to get udev working on kernel 2.6.0 which has support for hot-pluggable devices and module loading/unloading enabled. I don't think I need to be running kernel 2.6.0 in order to just compile udev, am I correct here??
- I didn't switch my system to kernel 2.6.0 and udev, I am trying to test it within initrd (Initial Ram Disk), so what I have is a subdirectory in my home directory, where I installed busybox, bash, insmod, modprobe, hotplug scripts and udev, plus the needed shared libraries in /lib. Note I installed udev with the following command "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the config files etc should be relative to the root directory, and I've checked them, they're fine. I created a initrd and put it on a CD-RW disk and that's what I am booting from and testing udev. My question is, does running udev withing initrd make any impact on its operations? May be the reason why it doesn't work for me is because it has some issues in initrd environment???If nothing else, what else do you think could be wrong??
Quoted 9 lines
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Quoted 12 lines · Greg KH
Quoted 10 lines
- I didn't switch my system to kernel 2.6.0 and udev, I am trying to test it within initrd (Initial Ram Disk), so what I have is a subdirectory in my home directory, where I installed busybox, bash, insmod, modprobe, hotplug scripts and udev, plus the needed shared libraries in /lib. Note I installed udev with the following command "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the config files etc should be relative to the root directory, and I've checked them, they're fine. I created a initrd and put it on a CD-RW disk and that's what I am booting from and testing udev. My question is, does running udev withing initrd make any impact on its operations?
Quoted 2 lines
It shouldn't. You built the klibc version, right?
no I didn't, udev was linked against glibc, does it have to be linked against klibc? I mean I have glibc.so.6 and ld-linux.so.2 in my initrd environment
roman@athlon1000:~/kernel/udev-012> ldd udev
libc.so.6 => /lib/libc.so.6 (0x4001e000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)roman@athlon1000:~/kernel/udev-012>
Quoted 6 lines
Quoted 3 lines
May be the reason why it doesn't work for me is because it has some issues in initrd environment???
Is sysfs mounted when udev is called? That's a requirement.
yeah proc and sysfs are mounted on /proc and /sysfs
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Quoted 10 lines · Jon Smirl
udev won't work if sysfs isn't mounted. from fstab...
none /sys sysfs defaults 0 0Does your sysfs directory have a class directory? under the various classes do they have dev attributes? For example:
/sys/class/tty/console/devWithout these dev entries udev won't work. They should be automatically generated by the device drivers.
no I mount it by hand
mount -t sysfs none /sys
and there are entries under /sys :-)
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Here is the output of that perl script, any ideas??
roman@athlon1000:~/kernel/udev-012/test> ./udev-test.pl > out 2>&1 roman@athlon1000:~/kernel/udev-012/test> mc
roman@athlon1000:~/kernel/udev-012/test> cat out
udev-test will run 30 tests:
TEST: label test of scsi disc
method 'LABEL' for 'block/sda' expecting node 'boot_disk'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.
remove: ok
TEST: label test of scsi partition
method 'LABEL' for 'block/sda/sda1' expecting node 'boot_disk1'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.
remove: ok
TEST: label test of pattern match
method 'LABEL' for 'block/sda/sda1' expecting node 'boot_disk1'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.
remove: ok
.........etc
rm: cannot change to directory `udev-root/visor': Permission denied
rm: cannot remove directory `udev-root': Directory not empty roman@athlon1000:~/kernel/udev-012/test>
roman@athlon1000:~/kernel/udev-012/test> ls -l udev-root/ total 1
drw-rw-rw- 2 roman users 48 Jan 3 06:21 visor
roman@athlon1000:~/kernel/udev-012/test>
Ahh? no execute permissions for directory? Is it supposed to be like that?
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It doesn't work without execute permissions
[root@smirl init.d]# chmod 666 /udev
[root@smirl init.d]# ls /udev
[root@smirl init.d]# ./udev start
Creating initial udev device nodes: [ OK ]
./udev: line 82: 9288 Bus error $bin block
[root@smirl init.d]# ./udev stop
Removing udev device nodes: [ OK ]
[root@smirl init.d]# chmod 777 /udev
[root@smirl init.d]# ./udev start
Creating initial udev device nodes: [ OK ]
[root@smirl init.d]#
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Quoted 38 lines · Roman Duka
Here is the output of that perl script, any ideas??
roman@athlon1000:~/kernel/udev-012/test> ./udev-test.pl > out 2>&1 roman@athlon1000:~/kernel/udev-012/test> mc
roman@athlon1000:~/kernel/udev-012/test> cat out
udev-test will run 30 tests:
TEST: label test of scsi disc
method 'LABEL' for 'block/sda' expecting node 'boot_disk'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.remove: ok
TEST: label test of scsi partition
method 'LABEL' for 'block/sda/sda1' expecting node 'boot_disk1'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.remove: ok
TEST: label test of pattern match
method 'LABEL' for 'block/sda/sda1' expecting node 'boot_disk1'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.remove: ok
.........etc
rm: cannot change to directory `udev-root/visor': Permission denied
rm: cannot remove directory `udev-root': Directory not empty roman@athlon1000:~/kernel/udev-012/test>
Quoted 6 lines
roman@athlon1000:~/kernel/udev-012/test> ls -l udev-root/ total 1
drw-rw-rw- 2 roman users 48 Jan 3 06:21 visor
roman@athlon1000:~/kernel/udev-012/test>Ahh? no execute permissions for directory? Is it supposed to be like that?
No ignor this perl test thing, I needed to be root for that, it runs ok, but that's about it, everything else is as it was
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Quoted 14 lines · Jon Smirl
It doesn't work without execute permissions
[root@smirl init.d]# chmod 666 /udev [root@smirl init.d]# ls /udev [root@smirl init.d]# ./udev start
Creating initial udev device nodes: [ OK ]
./udev: line 82: 9288 Bus error $bin block
[root@smirl init.d]# ./udev stop
Removing udev device nodes: [ OK ]
[root@smirl init.d]# chmod 777 /udev [root@smirl init.d]# ./udev start
Creating initial udev device nodes: [ OK ]
[root@smirl init.d]#
Well I do have execute permissions on my /dev/ and /udev/ directories and I run everything as root, I run udev start, and it runs OK, but it doesn't populate /dev/ directory. Like I said, I'm running this within initrd (Initial RamDisk) so everything is in RAM, including the root filesystem.
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Quoted 13 lines · Roman Duka
Quoted 12 lines · Greg KH
Quoted 10 lines
- I didn't switch my system to kernel 2.6.0 and udev, I am trying to test it within initrd (Initial Ram Disk), so what I have is a subdirectory in my home directory, where I installed busybox, bash, insmod, modprobe, hotplug scripts and udev, plus the needed shared libraries in /lib. Note I installed udev with the following command "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the config files etc should be relative to the root directory, and I've checked them, they're fine. I created a initrd and put it on a CD-RW disk and that's what I am booting from and testing udev. My question is, does running udev withing initrd make any impact on its operations?
Quoted 8 lines
Quoted 2 lines
It shouldn't. You built the klibc version, right?
no I didn't, udev was linked against glibc, does it have to be linked against klibc? I mean I have glibc.so.6 and ld-linux.so.2 in my initrd environment
roman@athlon1000:~/kernel/udev-012> ldd udevlibc.so.6 => /lib/libc.so.6 (0x4001e000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
As long are you are sure udev is able to run properly, no, that's fine. But why not try using a build against klibc, that would remove any need for glibc.
thanks,
greg k-h
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Quoted 5 lines · Roman Duka
Here is the output of that perl script, any ideas??
roman@athlon1000:~/kernel/udev-012/test> ./udev-test.pl > out 2>&1 roman@athlon1000:~/kernel/udev-012/test> mc
Quoted 8 lines
roman@athlon1000:~/kernel/udev-012/test> cat out
udev-test will run 30 tests:
TEST: label test of scsi disc
method 'LABEL' for 'block/sda' expecting node 'boot_disk'
add: error
Can't exec "tree": No such file or directory at ./udev-test.pl line 382.
Ick, something's really wrong. Wait, you aren't running the script as root, are you? That's needed.
thanks,
greg k-h
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