bootstd: Support automatically setting Linux parameters
Some Linux parameters can be set automatically by U-Boot, if it knows the
device being used. For example, since U-Boot knows the serial console
being used, it can add parameters for earlycon and console.
Add support for this.
Note that this is an experimental feature and we will see how useful it
turns out to be. It is very handy for ChromeOS, since otherwise it is very
difficult to manually determine the UART address or port number,
particularly in a script.
Provide an example of how this is used with ChromeOS.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/bootflow.h b/include/bootflow.h
index 7a8595f..4152577 100644
--- a/include/bootflow.h
+++ b/include/bootflow.h
@@ -526,4 +526,16 @@
int bootflow_cmdline_get_arg(struct bootflow *bflow, const char *arg,
const char **val);
+/**
+ * bootflow_cmdline_auto() - Automatically set a value for a known argument
+ *
+ * This handles a small number of known arguments, for Linux in particular. It
+ * adds suitable kernel parameters automatically, e.g. to enable the console.
+ *
+ * @bflow: Bootflow to update
+ * @arg: Name of argument to set (e.g. "earlycon" or "console")
+ * Return: 0 if OK -ve on error
+ */
+int bootflow_cmdline_auto(struct bootflow *bflow, const char *arg);
+
#endif