diff --git a/platform/embedded/hci_transport_h4_ehcill_embedded.c b/platform/embedded/hci_transport_h4_ehcill_embedded.c
index fd95eb3f1..2738367f0 100644
--- a/platform/embedded/hci_transport_h4_ehcill_embedded.c
+++ b/platform/embedded/hci_transport_h4_ehcill_embedded.c
@@ -158,6 +158,7 @@ static const hci_transport_h4_t hci_transport_h4_ehcill_dma = {
   /*  .transport.can_send_packet_now           = */  h4_can_send_packet_now,
   /*  .transport.send_packet                   = */  ehcill_send_packet,
   /*  .transport.set_baudrate                  = */  h4_set_baudrate,
+  /*  .transport.reset_link                    = */  NULL,    
     },
   /*  .ds                                      = */  &hci_transport_h4_dma_ds
 };
diff --git a/platform/embedded/hci_transport_h4_embedded.c b/platform/embedded/hci_transport_h4_embedded.c
index 103ac0c58..b9a8d1959 100644
--- a/platform/embedded/hci_transport_h4_embedded.c
+++ b/platform/embedded/hci_transport_h4_embedded.c
@@ -122,6 +122,7 @@ static const hci_transport_h4_t hci_transport_h4_dma = {
   /*  .transport.can_send_packet_now           = */  h4_can_send_packet_now,
   /*  .transport.send_packet                   = */  h4_send_packet,
   /*  .transport.set_baudrate                  = */  h4_set_baudrate,
+  /*  .transport.reset_link                    = */  NULL,    
     },
   /*  .ds                                      = */  &hci_transport_h4_dma_ds
 };
diff --git a/platform/posix/hci_transport_h5_posix.c b/platform/posix/hci_transport_h5_posix.c
index 53e68abf3..b6dc0e18d 100644
--- a/platform/posix/hci_transport_h5_posix.c
+++ b/platform/posix/hci_transport_h5_posix.c
@@ -630,6 +630,7 @@ const hci_transport_t * hci_transport_h5_instance(void) {
         hci_transport_h5->can_send_packet_now           = &hci_transport_h5_can_send_packet_now;
         hci_transport_h5->send_packet                   = &hci_transport_h5_send_packet;
         hci_transport_h5->set_baudrate                  = &hci_transport_h5_set_baudrate;
+        hci_transport_h5->reset_link                    = &hci_transport_h5_reset_link;
     }
     return (const hci_transport_t *) hci_transport_h5;
 }
diff --git a/src/hci_transport.h b/src/hci_transport.h
index 8ee11b2ae..66986edb1 100644
--- a/src/hci_transport.h
+++ b/src/hci_transport.h
@@ -94,10 +94,15 @@ typedef struct {
     int    (*send_packet)(uint8_t packet_type, uint8_t *packet, int size);
 
     /**
-     *  extension for UART transport implementations
+     * extension for UART transport implementations
      */
     int    (*set_baudrate)(uint32_t baudrate);
 
+    /**
+     * extension for UART H5 on CSR: reset BCSP/H5 Link
+     */
+    void   (*reset_link)(void);
+
 } hci_transport_t;
 
 typedef enum {