diff --git a/boards/risc-v/eic7700x/eic7700-evb/configs/nsh/defconfig b/boards/risc-v/eic7700x/eic7700-evb/configs/nsh/defconfig
index dd8d2aaf194..15f32359329 100644
--- a/boards/risc-v/eic7700x/eic7700-evb/configs/nsh/defconfig
+++ b/boards/risc-v/eic7700x/eic7700-evb/configs/nsh/defconfig
@@ -78,8 +78,6 @@ CONFIG_INTELHEX_BINARY=y
 CONFIG_IRQ_WORK_STACKSIZE=2048
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
-CONFIG_LIBC_MEMSET_64BIT=y
-CONFIG_LIBC_MEMSET_OPTSPEED=y
 CONFIG_LIBC_PERROR_STDOUT=y
 CONFIG_LIBC_STRERROR=y
 CONFIG_MM_PGALLOC=y
@@ -96,6 +94,7 @@ CONFIG_RAM_SIZE=1006632960
 CONFIG_RAM_START=0x80200000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RISCV_STRING_FUNCTION=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_BACKTRACE=y
 CONFIG_SCHED_CPULOAD_SYSCLK=y
diff --git a/boards/risc-v/eic7700x/starpro64/configs/nsh/defconfig b/boards/risc-v/eic7700x/starpro64/configs/nsh/defconfig
index b7e11be2a6a..45abad45598 100644
--- a/boards/risc-v/eic7700x/starpro64/configs/nsh/defconfig
+++ b/boards/risc-v/eic7700x/starpro64/configs/nsh/defconfig
@@ -73,8 +73,6 @@ CONFIG_INTELHEX_BINARY=y
 CONFIG_IRQ_WORK_STACKSIZE=2048
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
-CONFIG_LIBC_MEMSET_64BIT=y
-CONFIG_LIBC_MEMSET_OPTSPEED=y
 CONFIG_LIBC_PERROR_STDOUT=y
 CONFIG_LIBC_STRERROR=y
 CONFIG_MM_PGALLOC=y
@@ -91,6 +89,7 @@ CONFIG_RAM_SIZE=1006632960
 CONFIG_RAM_START=0x80200000
 CONFIG_RAW_BINARY=y
 CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RISCV_STRING_FUNCTION=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_BACKTRACE=y
 CONFIG_SCHED_CPULOAD_SYSCLK=y