// -*- mode:doc; -*-
// vim: set syntax=asciidoc:

== Configuration of other components

Before attempting to modify any of the components below, make sure you
have already configured Buildroot itself, and have enabled the
corresponding package.

BusyBox::
+
If you already have a BusyBox configuration file, you can directly
specify this file in the Buildroot configuration, using
+BR2_PACKAGE_BUSYBOX_CONFIG+. Otherwise, Buildroot will start from a
default BusyBox configuration file.
+
To make subsequent changes to the configuration, use +make
busybox-menuconfig+ to open the BusyBox configuration editor.
+
It is also possible to specify a BusyBox configuration file through an
environment variable, although this is not recommended. Refer to
xref:env-vars[] for more details.

uClibc::
+
Configuration of uClibc is done in the same way as for BusyBox. The
configuration variable to specify an existing configuration file is
+BR2_UCLIBC_CONFIG+. The command to make subsequent changes is +make
uclibc-menuconfig+.

Linux kernel::
+
If you already have a kernel configuration file, you can directly
specify this file in the Buildroot configuration, using
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG+.
+
If you do not yet have a kernel configuration file, you can either start
by specifying a defconfig in the Buildroot configuration, using
+BR2_LINUX_KERNEL_USE_DEFCONFIG+, or start by creating an empty file and
specifying it as custom configuration file, using
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG+.
+
To make subsequent changes to the configuration, use +make
linux-menuconfig+ to open the Linux configuration editor.

Barebox::
+
Configuration of Barebox is done in the same way as for the Linux
kernel. The corresponding configuration variables are
+BR2_TARGET_BAREBOX_USE_CUSTOM_CONFIG+ and
+BR2_TARGET_BAREBOX_USE_DEFCONFIG+. To open the configuration editor,
use +make barebox-menuconfig+.

U-Boot::
+
Configuration of U-Boot (version 2015.04 or newer) is done in the same
way as for the Linux kernel. The corresponding configuration variables
are +BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG+ and
+BR2_TARGET_UBOOT_USE_DEFCONFIG+. To open the configuration editor,
use +make uboot-menuconfig+.