diff -Naur u-boot-2021.07/include/configs/sifive-unmatched.h u-boot-2021.07-mod/include/configs/sifive-unmatched.h
--- u-boot-2021.07/include/configs/sifive-unmatched.h	2021-07-05 17:11:28.000000000 +0200
+++ u-boot-2021.07-mod/include/configs/sifive-unmatched.h	2021-07-31 18:58:45.597873661 +0200
@@ -62,6 +62,8 @@
 	"name=system,size=-,bootable,type=${type_guid_gpt_system};"
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
+        "fdt_high=0xffffffffffffffff\0" \
+        "initrd_high=0xffffffffffffffff\0" \
 	"kernel_addr_r=0x84000000\0" \
 	"fdt_addr_r=0x88000000\0" \
 	"scriptaddr=0x88100000\0" \