spl: fat: Support full fitImage handling

Handle the case where the full fitImage support is enabled. In this
case, the whole fitImage must be loaded up front as some parts of the
fitImage code require memory-mapped access to the entire fitImage.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>

common/spl/spl_fat.c

@@ -70,7 +70,18 @@ int spl_load_image_fat(struct spl_image_info *spl_image,
 	if (err <= 0)
 		goto end;
 
-	if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
+	if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
+	    image_get_magic(header) == FDT_MAGIC) {
+		err = file_fat_read(filename, (void *)CONFIG_SYS_LOAD_ADDR, 0);
+		if (err <= 0)
+			goto end;
+		err = spl_parse_image_header(spl_image,
+				(struct image_header *)CONFIG_SYS_LOAD_ADDR);
+		if (err == -EAGAIN)
+			return err;
+		if (err == 0)
+			err = 1;
+	} else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
 	    image_get_magic(header) == FDT_MAGIC) {
 		struct spl_load_info load;