spl: Convert spl_board_load_image() to use linker list

Add a linker list declaration for this method and remove the explicit
switch() code. Update existing users.

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

arch/arm/mach-sunxi/board.c

@@ -133,13 +133,16 @@ static int gpio_init(void)
 	return 0;
 }
 
-int spl_board_load_image(struct spl_boot_device *bootdev)
+#ifdef CONFIG_SPL_BUILD
+static int spl_board_load_image(struct spl_boot_device *bootdev)
 {
 	debug("Returning to FEL sp=%x, lr=%x\n", fel_stash.sp, fel_stash.lr);
 	return_to_fel(fel_stash.sp, fel_stash.lr);
 
 	return 0;
 }
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_BOARD, spl_board_load_image);
+#endif
 
 void s_init(void)
 {

arch/arm/mach-uniphier/boot-mode/spl_board.c

@@ -65,7 +65,7 @@ int uniphier_rom_get_mmc_funcptr(int (**send_cmd)(u32, u32),
 	return 0;
 }
 
-int spl_board_load_image(struct spl_boot_device *bootdev)
+static int spl_board_load_image(struct spl_boot_device *bootdev)
 {
 	int (*send_cmd)(u32 cmd, u32 arg);
 	int (*card_blockaddr)(u32 rca);
@@ -126,3 +126,4 @@ int spl_board_load_image(struct spl_boot_device *bootdev)
 
 	return 0;
 }
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_BOARD, spl_board_load_image);

arch/sandbox/cpu/spl.c

@@ -38,7 +38,7 @@ void spl_board_announce_boot_device(void)
 	printf("%s\n", fname);
 }
 
-int spl_board_load_image(struct spl_boot_device *bootdev)
+static int spl_board_load_image(struct spl_boot_device *bootdev)
 {
 	char fname[256];
 	int ret;
@@ -50,6 +50,7 @@ int spl_board_load_image(struct spl_boot_device *bootdev)
 	/* Hopefully this will not return */
 	return os_spl_to_uboot(fname);
 }
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_BOARD, spl_board_load_image);
 
 void spl_board_init(void)
 {

common/spl/spl.c

@@ -383,19 +383,10 @@ static int spl_load_image(u32 boot_device)
 	if (loader)
 		return loader->load_image(&bootdev);
 
-	switch (boot_device) {
-#ifdef CONFIG_SPL_BOARD_LOAD_IMAGE
-	case BOOT_DEVICE_BOARD:
-		return spl_board_load_image(&bootdev);
-#endif
-	default:
 #if defined(CONFIG_SPL_SERIAL_SUPPORT) && defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-		puts("SPL: Unsupported Boot Device!\n");
+	puts("SPL: Unsupported Boot Device!\n");
 #endif
-		return -ENODEV;
-	}
-
-	return -EINVAL;
+	return -ENODEV;
 }
 
 void board_init_r(gd_t *dummy1, ulong dummy2)

include/spl.h

@@ -228,12 +228,4 @@ bool spl_was_boot_source(void);
  */
 int spl_dfu_cmd(int usbctrl, char *dfu_alt_info, char *interface, char *devstr);
 
-/**
- * Board-specific load method for boards that have a special way of loading
- * U-Boot, which does not fit with the existing SPL code.
- *
- * @return 0 on success, negative errno value on failure.
- */
-int spl_board_load_image(struct spl_boot_device *bootdev);
-
 #endif