diff --git a/boards/microchip/mec172xevb_assy6906/Kconfig.defconfig b/boards/microchip/mec172xevb_assy6906/Kconfig.defconfig
deleted file mode 100644
index c31952ed766..00000000000
--- a/boards/microchip/mec172xevb_assy6906/Kconfig.defconfig
+++ /dev/null
@@ -1,36 +0,0 @@
-# Copyright (c) 2021 Microchip Technology Inc.
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_MEC172XEVB_ASSY6906
-
-if RTOS_TIMER
-
-# XEC RTOS timer HW frequency is fixed at 32768 Hz.
-# The driver requires tickless mode and ticks per second to be 32768 for
-# accurate operation.
-
-config SYS_CLOCK_HW_CYCLES_PER_SEC
-	default 32768
-
-config SYS_CLOCK_TICKS_PER_SEC
-	default 32768
-
-endif # RTOS_TIMER
-
-if !RTOS_TIMER
-
-# If RTOS timer is not enabled we use ARM Cortex-M
-# SYSTICK. SYSTICK frequency is 96 MHz divided down by the MEC172x PCR
-# processor clock divider register. We assume PCR processor clock divider
-# is set to 1. Refer to SOC_MEC_PROC_CLK_DIV
-#
-
-config SYS_CLOCK_HW_CYCLES_PER_SEC
-	default 96000000
-
-config SYS_CLOCK_TICKS_PER_SEC
-	default 1000
-
-endif # RTOS_TIMER
-
-endif # BOARD_MEC172XEVB_ASSY6906
diff --git a/boards/microchip/mec172xevb_assy6906/mec172xevb_assy6906_defconfig b/boards/microchip/mec172xevb_assy6906/mec172xevb_assy6906_defconfig
index d1aeaeaac58..f2b72ae4282 100644
--- a/boards/microchip/mec172xevb_assy6906/mec172xevb_assy6906_defconfig
+++ b/boards/microchip/mec172xevb_assy6906/mec172xevb_assy6906_defconfig
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-CONFIG_RTOS_TIMER=y
-
 CONFIG_CLOCK_CONTROL=y
 CONFIG_GPIO=y
 CONFIG_SERIAL=y