MIPS: bootm: refactor preparation of Linux kernel command line

Move preparation of Linux kernel command line in a separate
function and mark it as legacy. Add a Kconfig option to make
that legacy mode configurable.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/Kconfig

@@ -116,6 +116,19 @@ config CPU_MIPS64_R2
 
 endchoice
 
+menu "OS boot interface"
+
+config MIPS_BOOT_CMDLINE_LEGACY
+	bool "Hand over legacy command line to Linux kernel"
+	default y
+	help
+	  Enable this option if you want U-Boot to hand over the Yamon-style
+	  command line to the kernel. All bootargs will be prepared as argc/argv
+	  compatible list. The argument count (argc) is stored in register $a0.
+	  The address of the argument list (argv) is stored in register $a1.
+
+endmenu
+
 config SUPPORTS_BIG_ENDIAN
 	bool
 

arch/mips/lib/bootm.c

@@ -20,6 +20,12 @@ DECLARE_GLOBAL_DATA_PTR;
 #define mips_boot_malta		0
 #endif
 
+#if defined(CONFIG_MIPS_BOOT_CMDLINE_LEGACY)
+#define mips_boot_cmdline_legacy	1
+#else
+#define mips_boot_cmdline_legacy	0
+#endif
+
 static int linux_argc;
 static char **linux_argv;
 static char *linux_argp;
@@ -92,7 +98,7 @@ static void linux_cmdline_dump(void)
 		debug("   arg %03d: %s\n", i, linux_argv[i]);
 }
 
-static void boot_cmdline_linux(bootm_headers_t *images)
+static void linux_cmdline_legacy(bootm_headers_t *images)
 {
 	const char *bootargs, *next, *quote;
 
@@ -130,8 +136,14 @@ static void boot_cmdline_linux(bootm_headers_t *images)
 
 		bootargs = next;
 	}
+}
 
-	linux_cmdline_dump();
+static void boot_cmdline_linux(bootm_headers_t *images)
+{
+	if (mips_boot_cmdline_legacy) {
+		linux_cmdline_legacy(images);
+		linux_cmdline_dump();
+	}
 }
 
 static void linux_env_init(void)