diff --git a/ports/mimxrt/mbedtls/mbedtls_config.h b/ports/mimxrt/mbedtls/mbedtls_config.h
index 1ab748d8e5..8e054ed517 100644
--- a/ports/mimxrt/mbedtls/mbedtls_config.h
+++ b/ports/mimxrt/mbedtls/mbedtls_config.h
@@ -88,10 +88,10 @@
 // Memory allocation hooks
 #include <stdlib.h>
 #include <stdio.h>
-void *m_calloc_mbedtls(size_t nmemb, size_t size);
-void m_free_mbedtls(void *ptr);
-#define MBEDTLS_PLATFORM_STD_CALLOC m_calloc_mbedtls
-#define MBEDTLS_PLATFORM_STD_FREE m_free_mbedtls
+void *m_tracked_calloc(size_t nmemb, size_t size);
+void m_tracked_free(void *ptr);
+#define MBEDTLS_PLATFORM_STD_CALLOC m_tracked_calloc
+#define MBEDTLS_PLATFORM_STD_FREE m_tracked_free
 #define MBEDTLS_PLATFORM_SNPRINTF_MACRO snprintf
 
 #include "mbedtls/check_config.h"
diff --git a/ports/mimxrt/mbedtls/mbedtls_port.c b/ports/mimxrt/mbedtls/mbedtls_port.c
index 928f12f3f1..e2002274b1 100644
--- a/ports/mimxrt/mbedtls/mbedtls_port.c
+++ b/ports/mimxrt/mbedtls/mbedtls_port.c
@@ -26,64 +26,9 @@
 
 #ifdef MICROPY_SSL_MBEDTLS
 
-#include "py/runtime.h"
-#include "py/gc.h"
 #include "fsl_trng.h"
 #include "mbedtls_config.h"
 
-#define DEBUG (0)
-
-#if DEBUG
-static size_t count_links(uint32_t *nb) {
-    void **p = MP_STATE_PORT(mbedtls_memory);
-    size_t n = 0;
-    *nb = 0;
-    while (p != NULL) {
-        ++n;
-        *nb += gc_nbytes(p);
-        p = (void **)p[1];
-    }
-    return n;
-}
-#endif
-
-void *m_calloc_mbedtls(size_t nmemb, size_t size) {
-    void **ptr = m_malloc0(nmemb * size + 2 * sizeof(uintptr_t));
-    #if DEBUG
-    uint32_t nb;
-    size_t n = count_links(&nb);
-    printf("mbed_alloc(%u, %u) -> (%u;%u) %p\n", nmemb, size, n, (uint)nb, ptr);
-    #endif
-    if (MP_STATE_PORT(mbedtls_memory) != NULL) {
-        MP_STATE_PORT(mbedtls_memory)[0] = ptr;
-    }
-    ptr[0] = NULL;
-    ptr[1] = MP_STATE_PORT(mbedtls_memory);
-    MP_STATE_PORT(mbedtls_memory) = ptr;
-    return &ptr[2];
-}
-
-void m_free_mbedtls(void *ptr_in) {
-    if (ptr_in == NULL) {
-        return;
-    }
-    void **ptr = &((void **)ptr_in)[-2];
-    #if DEBUG
-    uint32_t nb;
-    size_t n = count_links(&nb);
-    printf("mbed_free(%p, [%p, %p], nbytes=%u, links=%u;%u)\n", ptr, ptr[0], ptr[1], gc_nbytes(ptr), n, (uint)nb);
-    #endif
-    if (ptr[1] != NULL) {
-        ((void **)ptr[1])[0] = ptr[0];
-    }
-    if (ptr[0] != NULL) {
-        ((void **)ptr[0])[1] = ptr[1];
-    } else {
-        MP_STATE_PORT(mbedtls_memory) = ptr[1];
-    }
-    m_free(ptr);
-}
-
 int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
 
     // assumes that TRNG_Init was called during startup
diff --git a/ports/mimxrt/mpconfigport.h b/ports/mimxrt/mpconfigport.h
index 8572f69354..0fe6e298e2 100644
--- a/ports/mimxrt/mpconfigport.h
+++ b/ports/mimxrt/mpconfigport.h
@@ -48,6 +48,7 @@ uint32_t trng_random_u32(void);
 #define MICROPY_OPT_MAP_LOOKUP_CACHE        (1)
 
 // Python internal features
+#define MICROPY_TRACKED_ALLOC               (MICROPY_SSL_MBEDTLS)
 #define MICROPY_READER_VFS                  (1)
 #define MICROPY_ENABLE_GC                   (1)
 #define MICROPY_ENABLE_FINALISER            (1)
@@ -250,12 +251,6 @@ extern const struct _mp_obj_module_t mp_module_network;
 #define SOCKET_BUILTIN_MODULE
 #endif
 
-#if MICROPY_SSL_MBEDTLS
-#define MICROPY_PORT_ROOT_POINTER_MBEDTLS void **mbedtls_memory;
-#else
-#define MICROPY_PORT_ROOT_POINTER_MBEDTLS
-#endif
-
 #if defined(MICROPY_HW_ETH_MDC)
 extern const struct _mp_obj_type_t network_lan_type;
 #define MICROPY_HW_NIC_ETH                  { MP_ROM_QSTR(MP_QSTR_LAN), MP_ROM_PTR(&network_lan_type) },
@@ -290,10 +285,8 @@ extern const struct _mp_obj_type_t network_lan_type;
     void *machine_pin_irq_objects[MICROPY_HW_NUM_PIN_IRQS]; \
     /* list of registered NICs */ \
     mp_obj_list_t mod_network_nic_list; \
-    /* root pointers for sub-systems */ \
-    MICROPY_PORT_ROOT_POINTER_MBEDTLS \
     /* root pointers defined by a board */ \
-        MICROPY_BOARD_ROOT_POINTERS \
+    MICROPY_BOARD_ROOT_POINTERS \
 
 #define MP_STATE_PORT MP_STATE_VM