diff --git a/chipset-csr/bt_control_csr.c b/chipset-csr/bt_control_csr.c
index f0117ef5f..7e4375ad7 100644
--- a/chipset-csr/bt_control_csr.c
+++ b/chipset-csr/bt_control_csr.c
@@ -48,6 +48,7 @@
 #include <string.h>   /* memcpy */
 
 #include "bt_control.h"
+#include <btstack/utils.h>
 
 // minimal CSR init script
 static const uint8_t init_script[] = { 
@@ -102,6 +103,13 @@ static int bt_control_csr_next_cmd(void *config, uint8_t *hci_cmd_buffer){
 
     init_script_offset += payload_len;
 
+    // support for warm boot command
+    uint16_t varid = READ_BT_16(hci_cmd_buffer, 10);
+    printf("csr: varid 0x%04x\n", varid);
+    if (varid == 0x4002){
+        return 2;
+    }
+
     return 1; 
 }