Datasheet

“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 320 — #346
i
i
i
i
i
i
i
i
page for udev (man udev). Another source of information is Section 15 on
page 323.
14.4 Automatic Module Loading
If it has not been possible to initialize a device with /sbin/hwup, the agent
searches through module maps for a suitable driver. The first place it looks
is the maps contained in /etc/hotplug/*.handmap. If it does not find
the driver there, it also searches in /lib/modules/<kernelversion>
/modules.*map. To use a driver other than the standard driver for the
kernel, enter this in /etc/hotplug/*.handmap, as this is the first file
read.
Note the following differences between USB and PCI. The agent
usb.agent also searches for user-mode drivers in files /etc/hotplug/
usb.usermap and /etc/hotplug/usb/*.usermap. In this way it is
possible to call executable programs for particular devices. In the case
of PCI devices, pci.agent first queries hwinfo about driver modules.
Only if hwinfo does not know of any drivers does the agent look in
pci.handmap and the kernel map. As hwinfo has already looked there,
the inquiry must fail. hwinfo has an additional database available to it,
which is read after the handmap and before the kernel map.
The agent pci.agent can be confined to driver modules in a partic-
ular subdirectory of /lib/modules/<kernelversion>/kernel/
drivers. To specify this directory or several directories, enter the vari-
able HOTPLUG_PCI_DRIVERTYPE_WHITELIST in file /etc/sysconfig/
hotplug. Exclude directories by specifying them in HOTPLUG_PCI_-
DRIVERTYPE_BLACKLIST. The modules in these directories are never
loaded. Additionally, enter modules no agent is allowed to load in the file
/etc/hotplug/blacklist. Write each module name in a separate line.
If several suitable modules are found in a map file, only the first mod-
ule is loaded. To load all the modules, set HOTPLUG_LOAD_MULTIPLE_-
MODULES=yes.
Note
Modules loaded with hwup are not affected by this. Automatic
module loading occurs only in exceptional cases.
Note
320 14.4. Automatic Module Loading