FreeBSD: How To List Device Drivers ( modules ) Loaded In Memory

Posted on in Categories FreeBSD last updated December 2, 2004

A question from my email bag – How do you find out all drivers loaded by FreeBSD kernel?

Simply use the kldstat command to display the status of any files dynamically linked into the kernel. The kldstat utility first appeared in FreeBSD 3.0, replacing the lkm interface.

kldstat Command Example

Use kldstat command as follows:
# kldstat
Sample outputs:

 Id Refs Address    Size     Name
 1    6 0xc0100000 52679c   kernel
 3    1 0xc063b000 4a6ac    acpi.ko
 8    1 0xc162e000 1f000    smbfs.ko
 9    2 0xc1303000 3000     libiconv.ko
10    2 0xc1309000 3000     libmchain.ko

Where:

  • ID : Module id which can be used to remove module
  • Ref Address: Memory address
  • Size : Size of module
  • Name : Module name or file located in /boot/kernel directory

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

Leave a Comment