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diff --git a/lib/chibios-contrib/ext/mcux-sdk/devices/MIMXRT685S/system_MIMXRT685S_cm33.h b/lib/chibios-contrib/ext/mcux-sdk/devices/MIMXRT685S/system_MIMXRT685S_cm33.h
new file mode 100644
index 000000000..3393fe49b
--- /dev/null
+++ b/lib/chibios-contrib/ext/mcux-sdk/devices/MIMXRT685S/system_MIMXRT685S_cm33.h
@@ -0,0 +1,119 @@
+/*
+** ###################################################################
+**     Processors:          MIMXRT685SFAWBR_cm33
+**                          MIMXRT685SFFOB_cm33
+**                          MIMXRT685SFVKB_cm33
+**
+**     Compilers:           GNU C Compiler
+**                          IAR ANSI C/C++ Compiler for ARM
+**                          Keil ARM C/C++ Compiler
+**                          MCUXpresso Compiler
+**
+**     Reference manual:    MIMXRT685 User manual Rev. 0.95 11 November 2019
+**     Version:             rev. 2.0, 2019-11-12
+**     Build:               b201016
+**
+**     Abstract:
+**         Provides a system configuration function and a global variable that
+**         contains the system frequency. It configures the device and initializes
+**         the oscillator (PLL) that is part of the microcontroller device.
+**
+**     Copyright 2016 Freescale Semiconductor, Inc.
+**     Copyright 2016-2020 NXP
+**     All rights reserved.
+**
+**     SPDX-License-Identifier: BSD-3-Clause
+**
+**     http:                 www.nxp.com
+**     mail:                 [email protected]
+**
+**     Revisions:
+**     - rev. 1.0 (2018-06-19)
+**         Initial version.
+**     - rev. 2.0 (2019-11-12)
+**         Base on rev 0.95 RM (B0 Header)
+**
+** ###################################################################
+*/
+
+/*!
+ * @file MIMXRT685S_cm33
+ * @version 2.0
+ * @date 2019-11-12
+ * @brief Device specific configuration file for MIMXRT685S_cm33 (header file)
+ *
+ * Provides a system configuration function and a global variable that contains
+ * the system frequency. It configures the device and initializes the oscillator
+ * (PLL) that is part of the microcontroller device.
+ */
+
+#ifndef _SYSTEM_MIMXRT685S_cm33_H_
+#define _SYSTEM_MIMXRT685S_cm33_H_               /**< Symbol preventing repeated inclusion */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+
+#define DEFAULT_SYSTEM_CLOCK           12000000u           /* Default System clock value */
+#ifndef CLK_XTAL_OSC_CLK
+#define CLK_XTAL_OSC_CLK               24000000u           /* Default XTAL OSC clock */
+#endif
+#define CLK_RTC_32K_CLK                   32768u           /* RTC oscillator 32 kHz (32k_clk) */
+#define CLK_LPOSC_1MHZ                  1000000u           /* Low power oscillator 1 MHz (1m_lposc) */
+#define CLK_FRO_16MHZ                  16000000u           /* Slow FRO 16 MHz (fro_16m) */
+#define CLK_FRO_48MHZ                  48000000u           /* Fast FRO 48 MHz (fro_48m) */
+#define CLK_FRO_60MHZ                  60000000u           /* Fast FRO 60 MHz (fro_60m) */
+#ifndef CLK_EXT_CLKIN
+#define CLK_EXT_CLKIN                         0u           /* Default external CLKIN pin clock */
+#endif
+
+
+/**
+ * @brief System clock frequency (core clock)
+ *
+ * The system clock frequency supplied to the SysTick timer and the processor
+ * core clock. This variable can be used by the user application to setup the
+ * SysTick timer or configure other parameters. It may also be used by debugger to
+ * query the frequency of the debug timer or configure the trace clock speed
+ * SystemCoreClock is initialized with a correct predefined value.
+ */
+extern uint32_t SystemCoreClock;
+
+/**
+ * @brief Setup the microcontroller system.
+ *
+ * Typically this function configures the oscillator (PLL) that is part of the
+ * microcontroller device. For systems with variable clock speed it also updates
+ * the variable SystemCoreClock. SystemInit is called from startup_device file.
+ */
+void SystemInit (void);
+
+/**
+ * @brief Updates the SystemCoreClock variable.
+ *
+ * It must be called whenever the core clock is changed during program
+ * execution. SystemCoreClockUpdate() evaluates the clock register settings and calculates
+ * the current core clock.
+ */
+void SystemCoreClockUpdate (void);
+
+/**
+ * @brief SystemInit function hook.
+ *
+ * This weak function allows to call specific initialization code during the
+ * SystemInit() execution.This can be used when an application specific code needs
+ * to be called as close to the reset entry as possible (for example the Multicore
+ * Manager MCMGR_EarlyInit() function call).
+ * NOTE: No global r/w variables can be used in this hook function because the
+ * initialization of these variables happens after this function.
+ */
+void SystemInitHook (void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* _SYSTEM_MIMXRT685S_cm33_H_ */