The branch main has been updated by manu:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=6bcba8dac9a4ddaeabf84ad8d31b1113a9dcf8c2

commit 6bcba8dac9a4ddaeabf84ad8d31b1113a9dcf8c2
Author:     Emmanuel Vadot <m...@freebsd.org>
AuthorDate: 2021-03-23 15:37:25 +0000
Commit:     Emmanuel Vadot <m...@freebsd.org>
CommitDate: 2021-03-23 15:37:25 +0000

    arm64: Only check for freebsd,dts-version if we are booted in FDT mode.
    
    Reported by:      andrew
---
 sys/arm64/arm64/machdep.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/sys/arm64/arm64/machdep.c b/sys/arm64/arm64/machdep.c
index 308a870fe188..97fa374b1c75 100644
--- a/sys/arm64/arm64/machdep.c
+++ b/sys/arm64/arm64/machdep.c
@@ -1356,16 +1356,18 @@ initarm(struct arm64_bootparams *abp)
                strlcpy(kernelname, env, sizeof(kernelname));
 
 #ifdef FDT
-       root = OF_finddevice("/");
-       if (OF_getprop(root, "freebsd,dts-version", dts_version, 
sizeof(dts_version)) > 0) {
-               if (strcmp(LINUX_DTS_VERSION, dts_version) != 0)
-                       printf("WARNING: DTB version is %s while kernel expects 
%s, "
-                           "please update the DTB in the ESP\n",
-                           dts_version,
-                           LINUX_DTS_VERSION);
-       } else {
-               printf("WARNING: Cannot find freebsd,dts-version property, "
-                   "cannot check DTB compliance\n");
+       if (arm64_bus_method == ARM64_BUS_FDT) {
+               root = OF_finddevice("/");
+               if (OF_getprop(root, "freebsd,dts-version", dts_version, 
sizeof(dts_version)) > 0) {
+                       if (strcmp(LINUX_DTS_VERSION, dts_version) != 0)
+                               printf("WARNING: DTB version is %s while kernel 
expects %s, "
+                                   "please update the DTB in the ESP\n",
+                                   dts_version,
+                                   LINUX_DTS_VERSION);
+               } else {
+                       printf("WARNING: Cannot find freebsd,dts-version 
property, "
+                           "cannot check DTB compliance\n");
+               }
        }
 #endif
 
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