doc: cmd: wget: add documentation

Add documentation for the wget command.

Signed-off-by: Ying-Chun Liu (PaulLiu) <[email protected]>
Cc: Christian Gmeiner <[email protected]>
Cc: Joe Hershberger <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Ramon Fried <[email protected]>
Cc: Simon Glass <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Ramon Fried <[email protected]>

2 files changed, 62 insertions, 0 deletions

diff --git a/doc/usage/cmd/wget.rst b/doc/usage/cmd/wget.rst
new file mode 100644
index 00000000000..4fcfa039543
--- /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 d6283fab8eb..0bc82887e9e 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -79,6 +79,7 @@ Shell commands
    cmd/ums
    cmd/ut
    cmd/wdt
+   cmd/wget
    cmd/xxd
 
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