SPL: Add option to skip copying of the mkimage header

On some system (e.g. powerpc), the load-address and entry-point is
located at address 0. So the current approach to load the image
(payload) including the header to the address "load-address - 64"
can't work here.

This patch adds an flag to skip this copying including header to
the SPL framework. By setting SPL_COPY_PAYLOAD_ONLY, only the
playload will be copied. This will be used by the SPL NOR flash
driver on powerpc.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>

common/spl/spl.c

@@ -76,10 +76,23 @@ void spl_parse_image_header(const struct image_header *header)
 	u32 header_size = sizeof(struct image_header);
 
 	if (image_get_magic(header) == IH_MAGIC) {
-		spl_image.size = image_get_data_size(header) + header_size;
-		spl_image.entry_point = image_get_load(header);
-		/* Load including the header */
-		spl_image.load_addr = spl_image.entry_point - header_size;
+		if (spl_image.flags & SPL_COPY_PAYLOAD_ONLY) {
+			/*
+			 * On some system (e.g. powerpc), the load-address and
+			 * entry-point is located at address 0. We can't load
+			 * to 0-0x40. So skip header in this case.
+			 */
+			spl_image.load_addr = image_get_load(header);
+			spl_image.entry_point = image_get_ep(header);
+			spl_image.size = image_get_data_size(header);
+		} else {
+			spl_image.entry_point = image_get_load(header);
+			/* Load including the header */
+			spl_image.load_addr = spl_image.entry_point -
+				header_size;
+			spl_image.size = image_get_data_size(header) +
+				header_size;
+		}
 		spl_image.os = image_get_os(header);
 		spl_image.name = image_get_name(header);
 		debug("spl: payload image: %s load addr: 0x%x size: %d\n",

include/spl.h

@@ -38,8 +38,11 @@ struct spl_image_info {
 	u32 load_addr;
 	u32 entry_point;
 	u32 size;
+	u32 flags;
 };
 
+#define SPL_COPY_PAYLOAD_ONLY	1
+
 extern struct spl_image_info spl_image;
 extern u32 *boot_params_ptr;