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From 02b9189111d560c40c1ee4252b65d1dd59244108 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 5 Dec 2014 17:26:26 +0000
Subject: [PATCH] fdt: Add support for the CONFIG_CMDLINE_EXTEND option
---
drivers/of/fdt.c | 29 ++++++++++++++++++++++++-----
1 file changed, 24 insertions(+), 5 deletions(-)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -957,19 +957,38 @@ int __init early_init_dt_scan_chosen(uns
/* Retrieve command line */
p = of_get_flat_dt_prop(node, "bootargs", &l);
- if (p != NULL && l > 0)
- strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
/*
* CONFIG_CMDLINE is meant to be a default in case nothing else
* managed to set the command line, unless CONFIG_CMDLINE_FORCE
* is set in which case we override whatever was found earlier.
+ *
+ * However, it can be useful to be able to treat the default as
+ * a starting point to be extended using CONFIG_CMDLINE_EXTEND.
*/
+ ((char *)data)[0] = '\0';
+
#ifdef CONFIG_CMDLINE
-#ifndef CONFIG_CMDLINE_FORCE
- if (!((char *)data)[0])
+ strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+
+ if (p != NULL && l > 0) {
+#if defined(CONFIG_CMDLINE_EXTEND)
+ int len = strlen(data);
+ if (len > 0) {
+ strlcat(data, " ", COMMAND_LINE_SIZE);
+ len++;
+ }
+ strlcpy((char *)data + len, p, min((int)l, COMMAND_LINE_SIZE - len));
+#elif defined(CONFIG_CMDLINE_FORCE)
+ pr_warning("Ignoring bootargs property (using the default kernel command line)\n");
+#else
+ /* Neither extend nor force - just override */
+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
#endif
- strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+ }
+#else /* CONFIG_CMDLINE */
+ if (p != NULL && l > 0)
+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
#endif /* CONFIG_CMDLINE */
pr_debug("Command line is: %s\n", (char*)data);
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