uboot-mediatek: add patch to allow accessing bootconf from Linux

Store selected boot configuration in '/chosen' node in device tree, so
it can be accessed by Linux (and used for fine-tuning the FIT partition
parser).

Signed-off-by: Daniel Golle <[email protected]>

package/boot/uboot-mediatek/patches/280-image-fdt-save-name-of-FIT-configuration-in-chosen-node.patch

@@ -0,0 +1,60 @@
+From patchwork Mon Mar 21 23:22:23 2022
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+X-Patchwork-Submitter: Daniel Golle <[email protected]>
+X-Patchwork-Id: 1607954
+Return-Path: <[email protected]>
+X-Original-To: [email protected]
+Delivered-To: [email protected]
+Date: Mon, 21 Mar 2022 23:22:23 +0000
+From: Daniel Golle <[email protected]>
+To: [email protected]
+Cc: Simon Glass <[email protected]>, Alexandru Gagniuc <[email protected]>,
+ Patrick Delaunay <[email protected]>,
+ Heinrich Schuchardt <[email protected]>
+Subject: [PATCH] image-fdt: save name of FIT configuration in '/chosen' node
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+
+It can be useful for the OS (Linux) to know which configuration has
+been chosen by U-Boot when launching a FIT image.
+Store the name of the FIT configuration node used in a new string
+attribute called 'bootconf' in the '/chosen' node in device tree.
+
+Signed-off-by: Daniel Golle <[email protected]>
+---
+ boot/image-fdt.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/boot/image-fdt.c b/boot/image-fdt.c
+index 692a9ad3e4..4017bc94a6 100644
+--- a/boot/image-fdt.c
++++ b/boot/image-fdt.c
+@@ -601,6 +601,12 @@ int image_setup_libfdt(bootm_headers_t *images, void *blob,
+ 		goto err;
+ 	}
+ 
++	/* Store name of configuration node as bootconf in /chosen node */
++	if (images->fit_uname_cfg)
++		fdt_find_and_setprop(blob, "/chosen", "bootconf",
++					images->fit_uname_cfg,
++					strlen(images->fit_uname_cfg) + 1, 1);
++
+ 	/* Update ethernet nodes */
+ 	fdt_fixup_ethernet(blob);
+ #if CONFIG_IS_ENABLED(CMD_PSTORE)