diff --git a/boards/risc-v/bl602/bl602evb/configs/elf/defconfig b/boards/risc-v/bl602/bl602evb/configs/elf/defconfig
index a0e83bb893..125e2d7ce2 100644
--- a/boards/risc-v/bl602/bl602evb/configs/elf/defconfig
+++ b/boards/risc-v/bl602/bl602evb/configs/elf/defconfig
@@ -6,6 +6,7 @@
 # modifications.
 #
 # CONFIG_BINFMT_DISABLE is not set
+# CONFIG_DISABLE_POSIX_TIMERS is not set
 # CONFIG_DISABLE_PTHREAD is not set
 # CONFIG_FS_PROCFS_EXCLUDE_BLOCKS is not set
 # CONFIG_FS_PROCFS_EXCLUDE_ENVIRON is not set
@@ -48,12 +49,16 @@ CONFIG_EXECFUNCS_SYSTEM_SYMTAB=y
 CONFIG_FILE_STREAM=y
 CONFIG_FS_PROCFS=y
 CONFIG_FS_ROMFS=y
+CONFIG_HAVE_CXX=y
 CONFIG_IDLETHREAD_STACKSIZE=8192
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=8192
 CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBCXX=y
+CONFIG_LIBCXXABI=y
 CONFIG_LIBC_PERROR_STDOUT=y
 CONFIG_LIBC_STRERROR=y
+CONFIG_LIBM=y
 CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
diff --git a/boards/risc-v/bl602/bl602evb/configs/wifi/defconfig b/boards/risc-v/bl602/bl602evb/configs/wifi/defconfig
index e169286f61..967547f7ba 100644
--- a/boards/risc-v/bl602/bl602evb/configs/wifi/defconfig
+++ b/boards/risc-v/bl602/bl602evb/configs/wifi/defconfig
@@ -63,7 +63,6 @@ CONFIG_EXAMPLES_TCPBLASTER_DEVNAME="wlan0"
 CONFIG_EXAMPLES_TCPBLASTER_SERVERIP=0xc0a85802
 CONFIG_FILE_STREAM=y
 CONFIG_FS_PROCFS=y
-CONFIG_HAVE_CXX=y
 CONFIG_IDLETHREAD_STACKSIZE=800
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=1800
@@ -72,8 +71,6 @@ CONFIG_IOB_BUFSIZE=146
 CONFIG_IOB_NBUFFERS=64
 CONFIG_IOB_NCHAINS=32
 CONFIG_IOB_THROTTLE=10
-CONFIG_LIBCXX=y
-CONFIG_LIBCXXABI=y
 CONFIG_LIBC_LOCALTIME=y
 CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_LIBC_PERROR_STDOUT=y