From: Simon Glass <sjg@chromium.org>
Date: Fri, 17 Dec 2021 03:59:39 +0000 (-0700)
Subject: fdt: Show a runtime warning based on devicetree source
X-Git-Url: http://git.dujemihanovic.xyz/img/static/git-logo.png?a=commitdiff_plain;h=93233b07d08955dafdc8a7d2ef692d8b3facc439;p=u-boot.git

fdt: Show a runtime warning based on devicetree source

When running, if the devicetree failed to come from the expected source,
show a warning, e.g:

   U-Boot ...

   DRAM:  128 MiB
   Core:  42 devices, 11 uclasses, devicetree: separate
   Warning: Unexpected devicetree source (not from a prior stage)
   Warning: U-Boot may not function properly
   Flash: 64 MiB
   ...

These warnings should only appear if the board config has been changed, or
the prior stage is broken.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/common/board_r.c b/common/board_r.c
index 99adff14b3..6d520662db 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -598,6 +598,12 @@ static int dm_announce(void)
 		if (CONFIG_IS_ENABLED(OF_REAL))
 			printf(", devicetree: %s", fdtdec_get_srcname());
 		printf("\n");
+		if (IS_ENABLED(CONFIG_OF_HAS_PRIOR_STAGE) &&
+		    (gd->fdt_src == FDTSRC_SEPARATE ||
+		     gd->fdt_src == FDTSRC_EMBED)) {
+			printf("Warning: Unexpected devicetree source (not from a prior stage)");
+			printf("Warning: U-Boot may not function properly\n");
+		}
 	}
 
 	return 0;