Hello, It seems that the 2.9.11~20080817-3ubuntu2 release of sl-modem is one of causes of Launchpad bug 375148 "no more /dev/ttySL0 device node". In that release Ubuntu removed a modprobe conf file that creates a static device (mknod /dev/slamr0). I understand that creating static devices is not allowed in Ubuntu, but the problem is that sl-modem code doesn't dynamically create devices.
The following is the output of udevadm when modprobing slamr module, as far as I understand, this output is not enough to get udev to dynamically create a /dev/slamr* device. # udevadm monitor --environment --kernel you can see all the uevents sent when the module registers itself, the driver, the device, and finally the block and/or the class, etc. in sysfs. The slamr module only sends these uevents: UEVENT[1237419361.101064] add /module/slamr (module) ACTION=add DEVPATH=/module/slamr SUBSYSTEM=module SEQNUM=1395 UEVENT[1237419361.142691] add /bus/pci/drivers/slamr (drivers) ACTION=add DEVPATH=/bus/pci/drivers/slamr SUBSYSTEM=drivers SEQNUM=1396 Btw, sl-modem it isn't really maintained upstream (they just accept patches). As far as I understand, sl-modem code shouldn't use udev because of license problems. [1] [2] Maurizio Avogadro (he co-maintains sl-modem in Debian) suggested to me the following few months ago: "I think that the needed information for udev (basically major and minor) are usually sent in the block or in the class uevent: if I got this right, the class uevent is sent if an instance of the GPL-only structs class_create() and device_create() has been created. I completely ignore whether there are some other ways to send the needed data to udev or not: that was the way slamr sent the needed information along with its class uevent until kernel 2.6.13 (when the structs had different names). I think the patch you added has been introduced in order to automatically load the slamr module when an _already_existing_ char device node having major 242 is being accessed (thus superceding the corresponding alias line)." I think that the patch he mentioned in the last paragraph is Ubuntu's autoload.diff patch, that I've merged into Debian. [1] http://archives.linmodems.org/33183 [2] http://bugs.debian.org/354216 -- أحمد المحمودي (Ahmed El-Mahmoudy) Digital design engineer GPG KeyID: 0xEDDDA1B7 (@ subkeys.pgp.net) GPG Fingerprint: 8206 A196 2084 7E6D 0DF8 B176 BC19 6A94 EDDD A1B7 -- Ubuntu-motu mailing list Ubuntu-motu@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-motu
