[new uImage] ppc: Determine if we are booting an OF style

If we are bootin OF style than we can skip setting up some things
that are used for the old boot method.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Marian Balakowicz <m8@semihalf.com>

lib_ppc/bootm.c

@@ -71,10 +71,10 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 	bd_t	*kbd;
 	ulong	ep = 0;
 	void	(*kernel)(bd_t *, ulong, ulong, ulong, ulong);
+	ulong	of_size = 0;
 
 #if defined(CONFIG_OF_LIBFDT)
 	char	*of_flat_tree = NULL;
-	ulong	of_size = 0;
 #endif
 
 	/*
@@ -92,12 +92,19 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 	alloc_current = sp_limit = get_boot_sp_limit(sp);
 	debug ("=> set upper limit to 0x%08lx\n", sp_limit);
 
-	/* allocate space and init command line */
-	alloc_current = get_boot_cmdline (alloc_current, &cmd_start, &cmd_end);
+#if defined(CONFIG_OF_LIBFDT)
+	/* find flattened device tree */
+	get_fdt (cmdtp, flag, argc, argv, images, &of_flat_tree, &of_size);
+#endif
 
-	/* allocate space for kernel copy of board info */
-	alloc_current = get_boot_kbd (alloc_current, &kbd);
-	set_clocks_in_mhz(kbd);
+	if (!of_size) {
+		/* allocate space and init command line */
+		alloc_current = get_boot_cmdline (alloc_current, &cmd_start, &cmd_end);
+
+		/* allocate space for kernel copy of board info */
+		alloc_current = get_boot_kbd (alloc_current, &kbd);
+		set_clocks_in_mhz(kbd);
+	}
 
 	/* find kernel entry point */
 	if (images->legacy_hdr_valid) {
@@ -123,9 +130,6 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 			sp_limit, get_sp (), &initrd_start, &initrd_end);
 
 #if defined(CONFIG_OF_LIBFDT)
-	/* find flattened device tree */
-	get_fdt (cmdtp, flag, argc, argv, images, &of_flat_tree, &of_size);
-
 	alloc_current = fdt_relocate (alloc_current,
 			cmdtp, flag, argc, argv, &of_flat_tree, &of_size);