1 files changed, 79 insertions, 0 deletions
diff --git a/common/bootargs.c b/common/bootargs.c
new file mode 100644
index 0000000000..b17e6d15ae
--- /dev/null
+++ b/common/bootargs.c
@@ -0,0 +1,79 @@
+/*
+ * bootargs.c - concatenate Linux bootargs
+ *
+ * Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <common.h>
+#include <boot.h>
+#include <malloc.h>
+#include <globalvar.h>
+#include <environment.h>
+
+static char *linux_bootargs;
+static int linux_bootargs_overwritten;
+
+/*
+ * This returns the Linux bootargs
+ *
+ * There are two ways to handle bootargs. The old legacy way is to use the
+ * 'bootargs' environment variable. The new and more flexible way is to use
+ * global variables beginning with "global.linux.bootargs." and
+ * "global.linux.mtdparts.". These variables will be concatenated together to
+ * the resulting bootargs. If there are no "global.linux.bootargs." variables
+ * we fall back to "bootargs"
+ */
+const char *linux_bootargs_get(void)
+{
+	char *bootargs, *mtdparts;
+
+	if (linux_bootargs_overwritten)
+		return linux_bootargs;
+
+	free(linux_bootargs);
+
+	bootargs = globalvar_get_match("linux.bootargs.", " ");
+	if (!strlen(bootargs))
+		return getenv("bootargs");
+
+	mtdparts = globalvar_get_match("linux.mtdparts.", ";");
+
+	if (strlen(mtdparts)) {
+		linux_bootargs = asprintf("%s mtdparts=%s", bootargs, mtdparts);
+		free(bootargs);
+		free(mtdparts);
+	} else {
+		free(mtdparts);
+		linux_bootargs = bootargs;
+	}
+
+	return linux_bootargs;
+}
+
+int linux_bootargs_overwrite(const char *bootargs)
+{
+	if (bootargs) {
+		free(linux_bootargs);
+		linux_bootargs = xstrdup(bootargs);
+		linux_bootargs_overwritten = 1;
+	} else {
+		linux_bootargs_overwritten = 0;
+	}
+
+	return 0;
+}