bootm: refactor ramdisk locating code

Move determing if we have a ramdisk and where its located into the
common code. Keep track of the ramdisk start and end in the
bootm_headers_t image struct.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/lib_i386/bootm.c b/lib_i386/bootm.c
index 452eef7..8c0b225 100644
--- a/lib_i386/bootm.c
+++ b/lib_i386/bootm.c
@@ -36,7 +36,6 @@
 {
 	void		*base_ptr;
 	ulong		os_data, os_len;
-	ulong		initrd_start, initrd_end;
 	image_header_t	*hdr;
 	int		ret;
 #if defined(CONFIG_FIT)
@@ -44,11 +43,6 @@
 	size_t		len;
 #endif
 
-	ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_I386,
-			&initrd_start, &initrd_end);
-	if (ret)
-		goto error;
-
 	if (images->legacy_hdr_valid) {
 		hdr = images->legacy_hdr_os;
 		if (image_check_type (hdr, IH_TYPE_MULTI)) {
@@ -76,7 +70,7 @@
 	}
 
 	base_ptr = load_zimage ((void*)os_data, os_len,
-			initrd_start, initrd_end - initrd_start, 0);
+			images->rd_start, images->rd_end - images->rd_start, 0);
 
 	if (NULL == base_ptr) {
 		printf ("## Kernel loading failed ...\n");