[PATCH v19 3/4] doc: cmd: wget: add documentation

[Ying-Chun Liu (PaulLiu)]

Add documentation for the wget command.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
Cc: Simon Glass <sjg at chromium.org>
---
 doc/usage/cmd/wget.rst | 61 ++++++++++++++++++++++++++++++++++++++++++
 doc/usage/index.rst    |  1 +
 2 files changed, 62 insertions(+)
 create mode 100644 doc/usage/cmd/wget.rst

diff --git a/doc/usage/cmd/wget.rst b/doc/usage/cmd/wget.rst
new file mode 100644
index 0000000000..4fcfa03954
--- /dev/null
+++ b/doc/usage/cmd/wget.rst
@@ -0,0 +1,61 @@
+.. SPDX-License-Identifier: GPL-2.0+:
+
+wget command
+============
+
+Synopsis
+--------
+
+::
+    wget address [[hostIPaddr:]path]
+
+Description
+-----------
+
+The wget command is used to download a file from an HTTP server.
+
+wget command will use HTTP over TCP to download files from an HTTP server.
+Currently it can only download image from an HTTP server hosted on port 80.
+
+address
+    memory address for the data downloaded
+
+hostIPaddr
+    IP address of the HTTP server, defaults to the value of environment
+    variable *serverip*
+
+path
+    path of the file to be downloaded.
+
+Example
+-------
+
+In the example the following steps are executed:
+
+* setup client network address
+* download a file from the HTTP server
+
+::
+
+    => setenv autoload no
+    => dhcp
+    BOOTP broadcast 1
+    *** Unhandled DHCP Option in OFFER/ACK: 23
+    *** Unhandled DHCP Option in OFFER/ACK: 23
+    DHCP client bound to address 192.168.1.105 (210 ms)
+    => wget ${loadaddr} 192.168.1.254:/index.html
+    HTTP/1.0 302 Found
+    Packets received 4, Transfer Successful
+
+Configuration
+-------------
+
+The command is only available if CONFIG_CMD_WGET=y.
+
+CONFIG_PROT_TCP_SACK can be turned on for the TCP SACK options. This will
+help increasing the downloading speed.
+
+Return value
+------------
+
+The return value $? is 0 (true) on success and 1 (false) otherwise.
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 90221015ee..11f5fcfaff 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -73,6 +73,7 @@ Shell commands
    cmd/true
    cmd/ums
    cmd/wdt
+   cmd/wget
    cmd/xxd
 
 Booting OS
-- 
2.35.1