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diff --git a/docs/rh_udev_for_dev.txt b/docs/rh_udev_for_dev.txt new file mode 100644 index 0000000000..1a21c0e59b --- /dev/null +++ b/docs/rh_udev_for_dev.txt @@ -0,0 +1,68 @@ +Troubleshooting udev for dev on Red Hat distro + +1) Make sure you have a rescue disk/cd in case you hose your machine. You've + been forewarned. +2) Grab latest udev tarball or clone udev bitkeeper tree + (bk://linuxusb.bkbits.net.udev) +3) Follow README and HOWTO-udev_for_dev documents + +The following is some additional help to get udev for dev up and running on RH. + +Q. I login as my normal self from the login screen and RH just hangs on an + empty blue screen. What's wrong? + +A. You have some wrong permissions. I'm guessing you can probably log in as root + but not as your normal user. Basically you need to edit the + /etc/udev/udev.permissions file to set the correct permissions to the nodes + in /dev. I added the following: + + null:root:users:0666 + urandom:root:users:0644 + + setting the correct permissions to null and urandom allowed me to login + as myself and not at root. + + While you are there you might want to set the permissions to ptmx as well + or you may have trouble getting a bash prompt in an xterm. i.e. + ptmx:root:users:0666 Also refer to the next question. + +Q. I'm having trouble getting a bash prompt from my xterm. i.e. I bring up a + terminal and all I have is a blank screen with a blinking cursor. + +A. First make sure you have the correct permissions set for ptmx. See above + Q&A for help on this. But I'm guessing that something is wrong with your + /dev/pts, thanks Captain Obvious, heh:) You probably have devpts mounted + to /dev/pts from /etc/fstab. I'm also guessing that you have sysfs mounted + to /sys from /etc/fstab as well. If this is the case then the line in + /etc/rc.sysinit + + action $"Mounting local filesystems:" mount -a -t nonfs,smbfs,ncpfs -O no_netdev + + will have mounted these for you. As a result you placed your call to + start_udev directly after this because the HOWTO-udev_for_dev document + told you to insert start_udev after /proc and /sys have been mounted. + Well start_udev actually overwrites /dev thus anything you had mounted in + /dev prior to start_udev being called will be blown away. So basically, + you mounted devpts to /dev/pts because everything in /etc/fstab was mounted + and then it was blown away by calling start_udev. A simple fix is to remove + the mount devpts line from /etc/fstab and mount it after calling start_udev. + I did the following: + + action $"Mounting local filesystems:" mount -a -t nonfs,smbfs,ncpfs -O no_netdev + /etc/rc.d/start_udev + action $"Mounting devpts: " mount -t devpts none /dev/pts + + After doing so I rebooted and was able to get my prompt from my xterm. + +Q. I'm getting some error messages during boot. How do I get rid of them? + +A. For me it was a matter of setting up Symlinks. Basically, some /dev entries + were being looked for and not being found so an error was thrown. For example, + /dev/cdrom was needed but udev had named it /dev/hdc by default. Basically I + edited my /etc/udev/udev.rules file to create a symlink from /dev/cdrom to + /dev/hdc and my error went away. + +These are some of the things I ran into. NOTE: I hosed my machine more than once +trying to figure this out and a rescue disk was my best friend. If you have any +other experiences and would like to add to this Q&A list feel free to send me a +patch (ogasawara@osdl.org). Hopefully this helped someone. Thanks. |