biosdevname (1) - Linux Man Pages
biosdevname: give BIOS-given name of a device
biosdevname - give BIOS-given name of a device
DESCRIPTIONbiosdevname takes a kernel device name as an argument, and returns the BIOS-given name it "should" be.
- -i, --interface
- Treat [args] as ethernet devs
- -d, --debug
- Enable debugging
- -p, --policy [physical|all_ethN]
- -P, --prefix [string]
- string use for embedded NICs in the physical policy (default=em)
- -x, --nopirq
- 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:
- em<port>[_<virtual instance>]
- for embedded NICs
- p<slot>p<port>[_<virtual instance>]
for cards in PCI slots
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,
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 boot (cold-plug).
EXIT CODESReturns 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. biosdevname 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 features 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 reports.
AUTHORbiosdevname was written by Matt Domsch <Matt_Domsch [at] dell.com>
This manual page was written by Rudy Gevaert <Rudy.Gevaert [at] UGent.be>, for the Debian project (but may be used by others).