[PATCH 3/3] doc: user: net: document Fastboot over UDP usage

[Roland Hieber <rhi@pengutronix.de>]

Signed-off-by: Roland Hieber <rhi@pengutronix.de>
---
 Documentation/user/networking.rst | 16 ++++++++++++++++
 Documentation/user/usb.rst        |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/user/networking.rst b/Documentation/user/networking.rst
index 6997da10dbea..605936c6a895 100644
--- a/Documentation/user/networking.rst
+++ b/Documentation/user/networking.rst
@@ -203,6 +203,22 @@ The netconsole can be used just like any other console. Note, however, that the
 simple console protocol is UDP based, so there is no guarantee about packet
 loss.
 
+Fastboot over UDP
+-----------------
+
+When built with ``CONFIG_NET_FASTBOOT=y`` and the environment variable
+``fastboot.net.autostart`` is set to any non-empty value, barebox will
+listen for fastboot commands on UDP port 5554.
+You might need to configure a IP address first in order to use fastboot (e.g.
+via DHCP or statically; see above).
+
+Additionally, you have to configure at least the ``fastboot.partitions``
+variable, see :ref:`usbgadget_variables`.
+
+On your development host, use fastboot with the ``-s udp:<IP-address>``
+parameter, specifying the IP address of your board.
+See :ref:`fastboot` for more information about Fastboot usage.
+
 DSA (Distributed Switch Architecture) Support in Barebox
 --------------------------------------------------------
 
diff --git a/Documentation/user/usb.rst b/Documentation/user/usb.rst
index 43072be53db7..f233927656bc 100644
--- a/Documentation/user/usb.rst
+++ b/Documentation/user/usb.rst
@@ -153,6 +153,8 @@ barebox can provide a serial console over USB. This can be initialized with the
 :ref:`command_usbserial` command. Once the host is plugged in it should show a
 new serial device, on Linux for example ``/dev/ttyACM0``.
 
+.. _fastboot:
+
 Android Fastboot support
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -307,6 +309,8 @@ chosen at boot time from other driver or script.
 To get usbgadget autostart support barebox has to be compiled with
 CONFIG_USB_GADGET_AUTOSTART enabled.
 
+.. _usbgadget_variables:
+
 USB Gadget autostart Options
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- 
2.39.5