BIOSDEVNAME(1)BIOSDEVNAME(1)NAMEbiosdevname - give BIOS-given name of a device
SYNOPSISbiosdevname [options] [args]...
DESCRIPTIONbiosdevname takes a kernel device name as an argument, and returns the
BIOS-given name it "should" be.
Treat [args] as ethernet devs
-p, --policy [physical|all_ethN]
-P, --prefix [string]
string use for embedded NICs in the physical policy (default=em)
Do not use $PIR table for mapping PCI device to slot. Some BIOS
have incorrect values.
-s, --smbios [x.y]
Require minimum SMBIOS version x.y
The physical policy is the current default. However, when invoking
biosdevname in udev rules, one should always specify the policy you
want, as the default has changed over time.
The physical policy uses the following scheme:
for embedded NICs
for cards in PCI slots
The all_ethN policy makes a best guess at what the device order
should be, with embedded devices first, PCI cards in ascending
slot order, and ports in ascending PCI bus/device/function order
breadth-first. However, this policy does not work if your PCI
devices are hot-plugged or hot-pluggable, including the virtual
functions on an SR-IOV device. In a hot-plug scenario, each
separate udev instance will be invoked in parallel, while the
device tree is still being populated with new devices. Each
udev instance will see a different PCI tree, and thus cannot
provide consistent enumeration. Use of this policy should be
limited to only scenarios where all PCI devices are present at
Returns 0 on success, with BIOS-suggested name printed to stdout.
Returns 1 on provided device name lookup failure.
Returns 2 if system BIOS does not provide naming information. biosdev‐
name requires system BIOS to provide naming information, either via
SMBIOS or sysfs files.
Returns 3 if not run as root but requires root privileges.
Returns 4 if running in a virtual machine.
The dmidecode package contains two tools useful for debugging BIOS fea‐
tures that biosdevname uses, specifically dmidecode to read the SMBIOS
Type 9 and Type 41 tables, and biosdecode to read the PCI IRQ Routing
Table. Please include the output of each of these programs in any bug
AUTHORbiosdevname was written by Matt Domsch <Matt_Domsch@dell.com>
This manual page was written by Rudy Gevaert <Rudy.Gevaert@UGent.be>,
for the Debian project (but may be used by others).
Nov 28, 2010 BIOSDEVNAME(1)