9. Udev ( cont... ) Udev creates the device node using the major and minor number got from the kernel and loads the device driver using the modalias information # mknod /dev/sdc b 8 20 # ls -l /dev/sdc brw-r--r-- 1 root root 8, 20 2009-12-20 10:35 /dev/sdc
10. Udev and modalias pci:v000011ABd00004363sv00001179sd0000FF10bc02sc00i00 V :- 000011AB D :- 00004363 sv and sd are subsystem version for both vendor and device. The best place to find the vendor/product from their id for a PCI device is http://www.pcidatabase.com/ . # grep -i 11AB /lib/modules/2.6.28-11-generic/modules.alias | grep 4363 alias pci:v000011ABd00004363sv*sd*bc*sc*i* sky2
15. HAL DB The system command lshal will list the HAL DB udi = '/org/freedesktop/Hal/devices/volume_uuid_da6ed050_2beb_4a3e_b446_8eb8bb81b149' block.device = '/dev/sda5' (string) block.is_volume = true (bool) block.major = 8 (0x8) (int) block.minor = 5 (0x5) (int) block.storage_device = '/org/freedesktop/Hal/devices/storage_serial_SATA_TOSHIBA_MK1237G_87FITJ8IT' (string) info.capabilities = {'volume', 'block'} (string list) info.category = 'volume' (string)
16. Other way to get the device info # hal-get-property --udi /org/freedesktop/Hal/devices/volume_uuid_da6ed050_2beb_4a3e_b446_8eb8bb81b149 --key volume.fstype ext4
18. Desktop application and HAL HAL exports all the device informations to desktop application like GNOME volume manager That helps it to mount the device to the file system.