bootstd: Add support for updating elements of the cmdline
Add a bootflow command to update the command line more easily. This allows
changing a particular parameter rather than editing a very long strings.
It is also easier to handle with scripting.
The new 'bootflow cmdline' command allows getting and setting single
parameters.
Fix up the example output while we are here, since there are a few new
items.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/doc/usage/cmd/bootflow.rst b/doc/usage/cmd/bootflow.rst
index 907d44a..07af789 100644
--- a/doc/usage/cmd/bootflow.rst
+++ b/doc/usage/cmd/bootflow.rst
@@ -13,7 +13,7 @@
bootflow select [<num|name>]
bootflow info [-d]
bootflow boot
-
+ bootflow cmdline [set|get|clear|delete] <param> [<value>]
Description
-----------
@@ -197,6 +197,26 @@
This boots the current bootflow.
+
+bootflow cmdline
+~~~~~~~~~~~~~~~~
+
+Some bootmeths can obtain the OS command line since it is stored with the OS.
+In that case, you can use `bootflow cmdline` to adjust this. The command line
+is assumed to be in the format used by Linux, i.e. a space-separated set of
+parameters with optional values, e.g. "noinitrd console=/dev/tty0".
+
+To change or add a parameter, use::
+
+ bootflow cmdline set <param> <value>
+
+To clear a parameter value to empty you can use "" for the value, or use::
+
+ bootflow cmdline clear <param>
+
+To delete a parameter entirely, use::
+
+ bootflow cmdline delete <param>
Example
-------