NAME

     fdtbus — Flattened Device Tree bus driver

SYNOPSIS

     options FDT

DESCRIPTION

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

     The fdtbus 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.

SEE ALSO

     fdt(4), openfirm(4), simplebus(4)

STANDARDS

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

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

HISTORY

     The fdtbus support first appeared in FreeBSD 9.0.

AUTHORS

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