spl: record boot_device into spl_image and call spl_perform_fixups

On some boards, we want to give the board/architecture-specific code a
chance to look at where the next image has been loaded from and
perform fixups before starting the next image.  This is of particular
importance, when we probe multiple devices for bootable payloads and
boot the first one found.

This change adds the following:
 - we record the boot_device used into the spl_image structure
 - we provide an extension-point for boards/architectures that can
   perform late fixups depending on a fully populated spl_image
   structure (i.e. we'll know the final boot_device and have info
   on the image type and operating system to be booted).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>

common/spl/spl.c

@@ -80,6 +80,11 @@ int __weak bootz_setup(ulong image, ulong *start, ulong *end)
 }
 #endif
 
+/* Weak default function for arch/board-specific fixups to the spl_image_info */
+void __weak spl_perform_fixups(struct spl_image_info *spl_image)
+{
+}
+
 void spl_fixup_fdt(void)
 {
 #if defined(CONFIG_SPL_OF_LIBFDT) && defined(CONFIG_SYS_SPL_ARGS_ADDR)
@@ -445,8 +450,10 @@ static int boot_from_devices(struct spl_image_info *spl_image,
 		else
 			puts("SPL: Unsupported Boot Device!\n");
 #endif
-		if (loader && !spl_load_image(spl_image, loader))
+		if (loader && !spl_load_image(spl_image, loader)) {
+			spl_image->boot_device = spl_boot_list[i];
 			return 0;
+		}
 	}
 
 	return -ENODEV;
@@ -498,6 +505,7 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 #ifdef CONFIG_SYS_SPL_ARGS_ADDR
 	spl_image.arg = (void *)CONFIG_SYS_SPL_ARGS_ADDR;
 #endif
+	spl_image.boot_device = BOOT_DEVICE_NONE;
 	board_boot_order(spl_boot_list);
 
 	if (boot_from_devices(&spl_image, spl_boot_list,
@@ -506,6 +514,8 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 		hang();
 	}
 
+	spl_perform_fixups(&spl_image);
+
 #ifdef CONFIG_CPU_V7M
 	spl_image.entry_point |= 0x1;
 #endif

include/spl.h

@@ -29,6 +29,7 @@ struct spl_image_info {
 #if CONFIG_IS_ENABLED(LOAD_FIT)
 	void *fdt_addr;
 #endif
+	u32 boot_device;
 	u32 size;
 	u32 flags;
 	void *arg;
@@ -296,4 +297,10 @@ void spl_invoke_atf(struct spl_image_info *spl_image);
  * can implement 'board_return_to_bootrom'.
  */
 void board_return_to_bootrom(void);
+
+/**
+ * spl_perform_fixups() - arch/board-specific callback before processing
+ *                        the boot-payload
+ */
+void spl_perform_fixups(struct spl_image_info *spl_image);
 #endif