07-02-2015
Quote:
Originally Posted by
nypreH
I am new in CentOS, can you please let me know how I can load drivers so it would be loaded before installation begins?
Nothing different to any other Linux here: use
modprode and
lsmod to find out which modules are loaded or load them respectively.
I hope this helps.
bakunin
This User Gave Thanks to bakunin For This Post:
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KLD(4) BSD Kernel Interfaces Manual KLD(4)
NAME
kld -- dynamic kernel linker facility
DESCRIPTION
The LKM (Loadable Kernel Modules) facility has been deprecated in FreeBSD 3.0 and above in favor of the kld interface. This interface, like
its predecessor, allows the system administrator to dynamically add and remove functionality from a running system. This ability also helps
software developers to develop new parts of the kernel without constantly rebooting to test their changes.
Various types of modules can be loaded into the system. There are several defined module types, listed below, which can be added to the sys-
tem in a predefined way. In addition, there is a generic type, for which the module itself handles loading and unloading.
The FreeBSD system makes extensive use of loadable kernel modules, and provides loadable versions of most file systems, the NFS client and
server, all the screen-savers, and the iBCS2 and Linux emulators. kld modules are placed by default in the /boot/kernel directory along with
their matching kernel.
The kld interface is used through the kldload(8), kldunload(8) and kldstat(8) programs.
The kldload(8) program can load either a.out(5) or ELF formatted loadable modules. The kldunload(8) program unloads any given loaded module,
if no other module is dependent upon the given module. The kldstat(8) program is used to check the status of the modules currently loaded
into the system.
Kernel modules may only be loaded or unloaded if the system security level kern.securelevel is less than one.
MODULE TYPES
Device Driver modules
New block and character device drivers may be loaded into the system with kld. Device nodes for the loaded drivers are automatically created
when a module is loaded and destroyed when it is unloaded by devfs(5). You can specify userland programs that will run when new devices
become available as a result of loading modules, or existing devices go away when modules are unloaded, by configuring devd(8).
FILES
/boot/kernel directory containing module binaries built for the kernel also residing in the directory.
/usr/include/sys/module.h file containing definitions required to compile a kld module
/usr/share/examples/kld example source code implementing a sample kld module
SEE ALSO
kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldstat(2), kldunload(2), devfs(5), devd(8), kldload(8), kldstat(8), kldunload(8),
sysctl(8)
HISTORY
The kld facility appeared in FreeBSD 3.0 and was designed as a replacement for the lkm facility, which was similar in functionality to the
loadable kernel modules facility provided by SunOS 4.1.3.
AUTHORS
The kld facility was originally implemented by Doug Rabson <dfr@FreeBSD.org>.
BUGS
If a module B, is dependent on another module A, but is not compiled with module A as a dependency, then kldload(8) fails to load module B,
even if module A is already present in the system.
If multiple modules are dependent on module A, and are compiled with module A as a dependency, then kldload(8) loads an instance of module A
when any of the modules are loaded.
If a custom entry point is used for a module, and the module is compiled as an 'ELF' binary, then kldload(8) fails to execute the entry
point.
kldload(8) returns the cryptic message 'ENOEXEC (Exec format error)' for any error encountered while loading a module.
When system internal interfaces change, old modules often cannot detect this, and such modules when loaded will often cause crashes or myste-
rious failures.
BSD
November 8, 1998 BSD