diff --git a/core/mbedtls/targets/TARGET_MCU_K64F/entropy_hardware_poll.c b/core/mbedtls/targets/TARGET_MCU_K64F/entropy_hardware_poll.c
deleted file mode 100644
index 7c7853573e..0000000000
--- a/core/mbedtls/targets/TARGET_MCU_K64F/entropy_hardware_poll.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- *  Hardware entropy collector for the K64F, using Freescale's RNGA
- *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if defined(TARGET_LIKE_K64F)
-
-/*
- * Reference: "K64 Sub-Family Reference Manual, Rev. 2", chapter 34
- */
-
-#include "fsl_clock_manager.h"
-
-/*
- * Get one byte of entropy from the RNG, assuming it is up and running.
- * As recommended (34.1.1), get only one bit of each output.
- */
-static void rng_get_byte( unsigned char *byte )
-{
-    size_t bit;
-
-    /* 34.5 Steps 3-4-5: poll SR and read from OR when ready */
-    for( bit = 0; bit < 8; bit++ )
-    {
-        while( ( RNG->SR & RNG_SR_OREG_LVL_MASK ) == 0 );
-        *byte |= ( RNG->OR & 1 ) << bit;
-    }
-}
-
-/*
- * Get len bytes of entropy from the hardware RNG.
- */
-int mbedtls_hardware_poll( void *data,
-                    unsigned char *output, size_t len, size_t *olen )
-{
-    size_t i;
-    int ret;
-    ((void) data);
-
-    CLOCK_SYS_EnableRngaClock( 0 );
-
-    /* Set "Interrupt Mask", "High Assurance" and "Go",
-     * unset "Clear interrupt" and "Sleep" */
-    RNG->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
-
-    for( i = 0; i < len; i++ )
-        rng_get_byte( output + i );
-
-    /* Just be extra sure that we didn't do it wrong */
-    if( ( RNG->SR & RNG_SR_SECV_MASK ) != 0 )
-    {
-        ret = -1;
-        goto cleanup;
-    }
-
-    *olen = len;
-    ret = 0;
-
-cleanup:
-    /* Disable clock to save power - assume we're the only users of RNG */
-    CLOCK_SYS_DisableRngaClock( 0 );
-
-    return( ret );
-}
-
-#endif
diff --git a/core/mbedtls/targets/TARGET_MCU_K64F/mbedtls/target_config.h b/core/mbedtls/targets/TARGET_MCU_K64F/mbedtls/target_config.h
deleted file mode 100644
index 372b6dc3c3..0000000000
--- a/core/mbedtls/targets/TARGET_MCU_K64F/mbedtls/target_config.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- *  Temporary target-specific config.h for entropy collection
- *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if defined(TARGET_LIKE_MBED)
-#define MBEDTLS_NO_PLATFORM_ENTROPY
-#undef MBEDTLS_HAVE_TIME_DATE
-#undef MBEDTLS_FS_IO
-#endif
-
-#if defined(TARGET_LIKE_K64F)
-#define MBEDTLS_ENTROPY_HARDWARE_ALT
-#endif