diff --git a/config/boards/khadas-vim4.conf b/config/boards/khadas-vim4.conf
index 49409a273d..5f81655758 100644
--- a/config/boards/khadas-vim4.conf
+++ b/config/boards/khadas-vim4.conf
@@ -3,6 +3,7 @@ BOARD_NAME="Khadas VIM4"
 BOARD_VENDOR="khadas"
 BOARDFAMILY="meson-s4t7"
 KERNEL_TARGET="legacy"
+KERNEL_TEST_TARGET="legacy"
 BOARD_MAINTAINER="adeepn leggewie pyavitz rpardini"
 SERIALCON="ttyS0" # for vendor kernel
 # BOOT_FDT_FILE="amlogic/kvim4.dtb" # not set on purpose; u-boot auto-selects kvim4.dtb or kvim4n.dtb for "new VIM4"
diff --git a/config/boards/nanopik1plus.csc b/config/boards/nanopik1plus.conf
similarity index 100%
rename from config/boards/nanopik1plus.csc
rename to config/boards/nanopik1plus.conf
diff --git a/config/boards/odroidhc4.csc b/config/boards/odroidhc4.conf
similarity index 100%
rename from config/boards/odroidhc4.csc
rename to config/boards/odroidhc4.conf
diff --git a/config/boards/orangepipc2.csc b/config/boards/orangepipc2.conf
similarity index 100%
rename from config/boards/orangepipc2.csc
rename to config/boards/orangepipc2.conf
diff --git a/config/boards/radxa-zero3.csc b/config/boards/radxa-zero3.conf
similarity index 100%
rename from config/boards/radxa-zero3.csc
rename to config/boards/radxa-zero3.conf