fdtbus(4) Flattened Device Tree bus driver


options FDT


The abstract bus driver is the primary connection and translation layer between fdt(4) hardware resources description and Fx native newbus device drivers framework. For an embedded system represents peripherals typically found on a highly integrated chip (system-on-chip).

The driver provides generic, common infrastructure for all fdt(4) oriented device drivers, and its main responsibilities are the following:

  • Creating newbus children that reflect fdt(4) nodes in the flattened device tree.
  • Managing SYS_RES_IRQ resources.
  • Managing SYS_RES_MEMORY, SYS_RES_IOPORT resources.


IEEE Std 1275: IEEE Standard for Boot (Initialization Configuration) Firmware: Core Requirements and Practices (Vt Open Firmware )

Power.org Standard for Embedded Power Architecture Platform Requirements (Vt ePAPR )


The support first appeared in Fx 9.0 .


The support was developed by Semihalf under sponsorship from the FreeBSD Foundation. This manual page was written by An Rafal Jaworowski .