bootm: Pass image buffer to boot_get_fdt()

Rather than having boot_get_fdt() calculate this, move the calculation
into the caller. This removes the access to argv[0] in this function,
so we can later refactor it to just accept argv[2] instead of the whole
argv[].

Move the function comment to the header file and fix the u8 argument,
while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

boot/bootm.c

@@ -490,11 +490,11 @@ int bootm_find_images(int flag, int argc, char *const argv[], ulong start,
 		      ulong size)
 {
 	const char *select = NULL;
+	ulong img_addr;
+	void *buf;
 	int ret;
 
 	if (IS_ENABLED(CONFIG_ANDROID_BOOT_IMAGE)) {
-		char *buf;
-
 		/* Look for an Android boot image */
 		buf = map_sysmem(images.os.start, 0);
 		if (buf && genimg_get_format(buf) == IMAGE_FORMAT_ANDROID)
@@ -525,9 +525,12 @@ int bootm_find_images(int flag, int argc, char *const argv[], ulong start,
 	}
 
 	if (CONFIG_IS_ENABLED(OF_LIBFDT)) {
+		img_addr = argc ? hextoul(argv[0], NULL) : image_load_addr;
+		buf = map_sysmem(img_addr, 0);
+
 		/* find flattened device tree */
-		ret = boot_get_fdt(flag, argc, argv, IH_ARCH_DEFAULT, &images,
+		ret = boot_get_fdt(buf, flag, argc, argv, IH_ARCH_DEFAULT,
-				   &images.ft_addr, &images.ft_len);
+				   &images, &images.ft_addr, &images.ft_len);
 		if (ret) {
 			puts("Could not find a valid device tree\n");
 			return 1;

boot/image-fdt.c

@@ -447,43 +447,17 @@ static int select_fdt(struct bootm_headers *images, const char *select, u8 arch,
 	return 0;
 }
 
-/**
+int boot_get_fdt(void *buf, int flag, int argc, char *const argv[], uint arch,
- * boot_get_fdt - main fdt handling routine
+		 struct bootm_headers *images, char **of_flat_tree,
- * @argc: command argument count
+		 ulong *of_size)
- * @argv: command argument list
- * @arch: architecture (IH_ARCH_...)
- * @images: pointer to the bootm images structure
- * @of_flat_tree: pointer to a char* variable, will hold fdt start address
- * @of_size: pointer to a ulong variable, will hold fdt length
- *
- * boot_get_fdt() is responsible for finding a valid flat device tree image.
- * Currently supported are the following ramdisk sources:
- *      - multicomponent kernel/ramdisk image,
- *      - commandline provided address of decicated ramdisk image.
- *
- * returns:
- *     0, if fdt image was found and valid, or skipped
- *     of_flat_tree and of_size are set to fdt start address and length if
- *     fdt image is found and valid
- *
- *     1, if fdt image is found but corrupted
- *     of_flat_tree and of_size are set to 0 if no fdt exists
- */
-int boot_get_fdt(int flag, int argc, char *const argv[], uint8_t arch,
-		 struct bootm_headers *images, char **of_flat_tree, ulong *of_size)
 {
-	ulong		img_addr;
 	ulong		fdt_addr;
 	char		*fdt_blob = NULL;
-	void		*buf;
 	const char *select = NULL;
 
 	*of_flat_tree = NULL;
 	*of_size = 0;
 
-	img_addr = (argc == 0) ? image_load_addr : hextoul(argv[0], NULL);
-	buf = map_sysmem(img_addr, 0);
-
 	if (argc > 2)
 		select = argv[2];
 	if (select || genimg_has_config(images)) {

include/image.h

@@ -808,9 +808,34 @@ int image_locate_script(void *buf, int size, const char *fit_uname,
 int fit_get_node_from_config(struct bootm_headers *images,
 			     const char *prop_name, ulong addr);
 
-int boot_get_fdt(int flag, int argc, char *const argv[], uint8_t arch,
+/**
-		 struct bootm_headers *images,
+ * boot_get_fdt() - locate FDT devicetree to use for booting
-		 char **of_flat_tree, ulong *of_size);
+ *
+ * @buf: Pointer to image
+ * @argc: command argument count
+ * @argv: command argument list
+ * @arch: architecture (IH_ARCH_...)
+ * @images: pointer to the bootm images structure
+ * @of_flat_tree: pointer to a char* variable, will hold fdt start address
+ * @of_size: pointer to a ulong variable, will hold fdt length
+ *
+ * boot_get_fdt() is responsible for finding a valid flat device tree image.
+ * Currently supported are the following FDT sources:
+ *      - multicomponent kernel/ramdisk/FDT image,
+ *      - commandline provided address of decicated FDT image.
+ *
+ * Return:
+ *     0, if fdt image was found and valid, or skipped
+ *     of_flat_tree and of_size are set to fdt start address and length if
+ *     fdt image is found and valid
+ *
+ *     1, if fdt image is found but corrupted
+ *     of_flat_tree and of_size are set to 0 if no fdt exists
+ */
+int boot_get_fdt(void *buf, int flag, int argc, char *const argv[], uint arch,
+		 struct bootm_headers *images, char **of_flat_tree,
+		 ulong *of_size);
+
 void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob);
 int boot_relocate_fdt(struct lmb *lmb, char **of_flat_tree, ulong *of_size);