This allows for directives such as makeoptions DTS+=/out/of/tree/myboard.dts # in tree! Same rules applied as if this were in a dtb/ module makeoptions DTS+=otherboard.dts to be specified in config(5) and have these built/installed alongside th kernel. The assumption that overlays live in an overlays/ directory is only made for in-tree DTSO, but we still make the assumption that out-of-tree arm64 DTS will be in vendored directories (for now). This lowers the cost to hacking on an overlay or dts by being able to quickly throw it in a custom config, especially if it doesn't fit one of the current dtb/modules quite appropriately or it's not intended for commit there. The build/install targets were split out of dtb.mk to centralize the build logic and leave out the all/realinstall/CLEANFILES additions... it was believed that we didn't want to pollute the kernel build with these. The build rules were converted to suffix rules at the suggestion of Ian to clean things up a little bit in a world where we can have mixed in-tree/out-of-tree DTS/DTSO specified. Reviewed by: ian MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D19351
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
Source Roadmap:
bin System/user commands.
cddl Various commands and libraries under the Common Development
and Distribution License.
contrib Packages contributed by 3rd parties.
crypto Cryptography stuff (see crypto/README).
etc Template files for /etc.
gnu Various commands and libraries under the GNU Public License.
Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
libexec System daemons.
release Release building Makefile & associated tools.
rescue Build system for statically linked /rescue utilities.
sbin System commands.
secure Cryptographic libraries and commands.
share Shared resources.
stand Boot loader sources.
sys Kernel sources.
sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
used in release builds. NOTES contains documentation of
all possible entries.
tests Regression tests which can be run by Kyua. See tests/README
for additional information.
tools Utilities for regression testing and miscellaneous tasks.
usr.bin User commands.
usr.sbin System administration commands.
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html