ppc64: Add CONFIG_CMDLINE, from ppc32

arch/ppc64/config.in

@@ -67,6 +67,11 @@ source drivers/parport/Config.in
 
 if [ "$CONFIG_PPC_ISERIES" != "y" ]; then
    bool 'Support for Open Firmware device tree in /proc' CONFIG_PROC_DEVICETREE
+
+   bool 'Default bootloader kernel arguments' CONFIG_CMDLINE_BOOL
+   if [ "$CONFIG_CMDLINE_BOOL" = "y" ] ; then
+     string 'Initial kernel command string' CONFIG_CMDLINE "console=ttyS0,9600 console=tty0 root=/dev/sda2"
+   fi
 fi
 
 endmenu

arch/ppc64/kernel/setup.c

@@ -379,10 +379,15 @@ void parse_cmd_line(unsigned long r3, unsigned long r4, unsigned long r5,
 #endif
 
 	cmd_line[0] = 0;
+
+#ifdef CONFIG_CMDLINE
+	strcpy(cmd_line, CONFIG_CMDLINE);
+#endif /* CONFIG_CMDLINE */
+
 	chosen = find_devices("chosen");
 	if (chosen != NULL) {
 		p = get_property(chosen, "bootargs", NULL);
-		if (p != NULL)
+		if (p != NULL && p[0] != 0)
 			strncpy(cmd_line, p, sizeof(cmd_line));
 	}
 	cmd_line[sizeof(cmd_line) - 1] = 0;