diff --git a/src/Makefile b/src/Makefile
index 9430501..6c9d931 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -62,7 +62,7 @@ SRC =			\
 
 include $(PLATFORM_DIR)/Makefile.inc
 
-OPT_FLAGS ?= -O2
+OPT_FLAGS ?= -Og
 CFLAGS += $(OPT_FLAGS)
 LDFLAGS += $(OPT_FLAGS)
 
diff --git a/src/platforms/hosted/Makefile.inc b/src/platforms/hosted/Makefile.inc
index 7c96aa8..fc00abe 100644
--- a/src/platforms/hosted/Makefile.inc
+++ b/src/platforms/hosted/Makefile.inc
@@ -1,5 +1,5 @@
 SYS = $(shell $(CC) -dumpmachine)
-CFLAGS += -DSTLINKV2 -DJTAG_HL -DENABLE_DEBUG
+CFLAGS += -DENABLE_DEBUG -DPLATFORM_HAS_DEBUG
 CFLAGS +=-I ./target -I./platforms/pc
 LDFLAGS += -lusb-1.0
 ifneq (, $(findstring mingw, $(SYS)))
diff --git a/src/platforms/hosted/platform.c b/src/platforms/hosted/platform.c
index 3c7df6d..a10a7a3 100644
--- a/src/platforms/hosted/platform.c
+++ b/src/platforms/hosted/platform.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of the Black Magic Debug project.
  *
- * Copyright (C) 2019
+ * Copyright (C) 2020
  * Written by Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de)
  *
  * This program is free software: you can redistribute it and/or modify
@@ -24,19 +24,182 @@
 #include "general.h"
 #include "swdptap.h"
 #include "jtagtap.h"
+#include "timing.h"
+#include "cl_utils.h"
+#include <signal.h>
 
-typedef enum bmp_t{
-	BMP_TYPE_NONE = 0
-}bmp_t;
+#define VENDOR_ID_BMP            0x1d50
+#define PRODUCT_ID_BMP           0x6018
+
+#define VENDOR_ID_STLINK         0x0483
+#define PRODUCT_ID_STLINK_MASK   0xffe0
+#define PRODUCT_ID_STLINK_GROUP  0x3740
+#define PRODUCT_ID_STLINKV1      0x3744
+#define PRODUCT_ID_STLINKV2      0x3748
+#define PRODUCT_ID_STLINKV21     0x374b
+#define PRODUCT_ID_STLINKV21_MSD 0x3752
+#define PRODUCT_ID_STLINKV3      0x374f
+#define PRODUCT_ID_STLINKV3E     0x374e
+
+bmp_info_t info;
 
-bmp_t active_bmp = BMP_TYPE_NONE;
 swd_proc_t swd_proc;
 jtag_proc_t jtag_proc;
 
+static void exit_function(void)
+{
+	libusb_exit(info.libusb_ctx);
+	fprintf(stderr, "INFO: Cleanup\n");
+}
+
+/* SIGTERM handler. */
+static void sigterm_handler(int sig)
+{
+	(void)sig;
+	exit(0);
+}
+
+static int find_debuggers(	BMP_CL_OPTIONS_t *cl_opts,bmp_info_t *info)
+{
+	libusb_device **devs;
+	int n_devs = libusb_get_device_list(info->libusb_ctx, &devs);
+    if (n_devs < 0) {
+        fprintf(stderr, "WARN:libusb_get_device_list() failed");
+		return -1;
+	}
+	bool report = false;
+	int found_debuggers;
+	struct libusb_device_descriptor desc;
+	char serial[64];
+	char manufacturer[128];
+	char product[128];
+	bmp_type_t type = BMP_TYPE_NONE;
+  rescan:
+	found_debuggers = 0;
+	for (int i = 0;  devs[i]; i++) {
+		libusb_device *dev =  devs[i];
+		int res = libusb_get_device_descriptor(dev, &desc);
+		if (res < 0) {
+            fprintf(stderr, "WARN: libusb_get_device_descriptor() failed: %s",
+					libusb_strerror(res));
+			libusb_free_device_list(devs, 0);
+			continue;
+		}
+		libusb_device_handle *handle;
+		res = libusb_open(dev, &handle);
+		if (res != LIBUSB_SUCCESS) {
+			fprintf(stderr,"WARN: Open failed\n");
+			continue;
+		}
+		res = libusb_get_string_descriptor_ascii(
+			handle, desc.iSerialNumber, (uint8_t*)serial,
+			sizeof(serial));
+		if (res <= 0) {
+			/* This can fail for many devices. Continue silent!*/
+			libusb_close(handle);
+			continue;
+		}
+		if (cl_opts->opt_serial && !strstr(serial, cl_opts->opt_serial)) {
+			libusb_close(handle);
+			continue;
+		}
+		res = libusb_get_string_descriptor_ascii(
+			handle, desc.iManufacturer, (uint8_t*)manufacturer,
+			sizeof(manufacturer));
+		if (res > 0) {
+			res = libusb_get_string_descriptor_ascii(
+				handle, desc.iProduct, (uint8_t*)product,
+				sizeof(product));
+			if (res <= 0) {
+				fprintf(stderr, "WARN:"
+						"libusb_get_string_descriptor_ascii "
+						"for ident_string failed: %s\n",
+						libusb_strerror(res));
+				libusb_close(handle);
+				continue;
+			}
+		}
+		if (cl_opts->opt_ident_string) {
+			char *match_manu = NULL;
+			char *match_product = NULL;
+			match_manu = strstr(manufacturer,	cl_opts->opt_ident_string);
+			match_product = strstr(product, cl_opts->opt_ident_string);
+			if (!match_manu && !match_product) {
+				libusb_close(handle);
+				continue;
+			}
+		}
+		/* Either serial and/or ident_string match or are not given.
+		 * Check type.*/
+		if ((desc.idVendor == VENDOR_ID_BMP) &&
+			(desc.idProduct == PRODUCT_ID_BMP)) {
+			type = BMP_TYPE_BMP;
+		} else if (desc.idVendor ==  VENDOR_ID_STLINK) {
+			if (desc.idProduct == PRODUCT_ID_STLINKV1) {
+				fprintf(stderr, "INFO: STLINKV1 not supported\n");
+				continue;
+			}
+			if ((desc.idProduct == PRODUCT_ID_STLINKV2) ||
+				(desc.idProduct == PRODUCT_ID_STLINKV21) ||
+				(desc.idProduct == PRODUCT_ID_STLINKV21_MSD) ||
+				(desc.idProduct == PRODUCT_ID_STLINKV3) ||
+				(desc.idProduct == PRODUCT_ID_STLINKV3E)) {
+				type = BMP_TYPE_STLINKV2;
+			}
+		} else {
+			continue;
+		}
+		found_debuggers ++;
+		if (report) {
+			printf("%2d: %s, %s, %s\n", found_debuggers,
+				   serial,
+				   manufacturer,product);
+		}
+		info->vid = desc.idVendor;
+		info->pid = desc.idProduct;
+		info->bmp_type = type;
+		strncpy(info->serial, serial, sizeof(info->serial));
+		strncpy(info->product, product, sizeof(info->product));
+		strncpy(info->manufacturer, manufacturer, sizeof(info->manufacturer));
+		if (cl_opts->opt_position &&
+			(cl_opts->opt_position == found_debuggers)) {
+			found_debuggers = 1;
+			break;
+		}
+	}
+	if (found_debuggers > 1) {
+		if (!report) {
+			printf("%d debuggers found! Select with -P <num>, -s <string> "
+				   "and/or -S <string>\n",
+				   found_debuggers);
+			report = true;
+			goto rescan;
+		}
+	}
+	libusb_free_device_list(devs, 0);
+	return 0;
+}
+
 void platform_init(int argc, char **argv)
 {
-	(void) argc;
-	(void) argv;
+	BMP_CL_OPTIONS_t cl_opts = {0};
+	cl_opts.opt_idstring = "Blackmagic PC-Hosted";
+	cl_init(&cl_opts, argc, argv);
+	atexit(exit_function);
+	signal(SIGTERM, sigterm_handler);
+	signal(SIGINT, sigterm_handler);
+	int res = libusb_init(&info.libusb_ctx);
+	if (res) {
+		fprintf(stderr, "Fatal: Failed to get USB context: %s\n",
+				libusb_strerror(res));
+		exit(-1);
+	}
+	if (find_debuggers(&cl_opts, &info)) {
+		exit(-1);
+	}
+	printf("Using %s %s %s\n", info.serial,
+		   info.manufacturer,
+		   info.product);
 	exit(-1);
 }
 
@@ -74,9 +237,19 @@ int platform_jtag_dp_init()
 
 char *platform_ident(void)
 {
-	switch (active_bmp) {
+	switch (info.bmp_type) {
 	  case BMP_TYPE_NONE:
 		return "NONE";
+	  case BMP_TYPE_BMP:
+		return "BMP";
+	  case BMP_TYPE_STLINKV2:
+		return "STLINKV2";
+	  case BMP_TYPE_LIBFTDI:
+		return "LIBFTDI";
+	  case BMP_TYPE_CMSIS_DAP:
+		return "CMSIS_DAP";
+	  case BMP_TYPE_JLINK:
+		return "JLINK";
 	}
 	return NULL;
 }
diff --git a/src/platforms/hosted/platform.h b/src/platforms/hosted/platform.h
index 545d7c1..0a28110 100644
--- a/src/platforms/hosted/platform.h
+++ b/src/platforms/hosted/platform.h
@@ -1,4 +1,6 @@
 #ifndef __PLATFORM_H
+#define __PLATFORM_H
+#include <libusb-1.0/libusb.h>
 #include "timing.h"
 
 char *platform_ident(void);
@@ -8,4 +10,24 @@ void platform_buffer_flush(void);
 #define SET_IDLE_STATE(x)
 #define SET_RUN_STATE(x)
 
+typedef enum bmp_type_s {
+	BMP_TYPE_NONE = 0,
+	BMP_TYPE_BMP,
+	BMP_TYPE_STLINKV2,
+	BMP_TYPE_LIBFTDI,
+	BMP_TYPE_CMSIS_DAP,
+	BMP_TYPE_JLINK
+} bmp_type_t;
+
+typedef struct bmp_info_s {
+	bmp_type_t bmp_type;
+	libusb_context *libusb_ctx;
+	unsigned int vid;
+	unsigned int pid;
+	char dev;
+	char serial[64];
+	char manufacturer[128];
+	char product[128];
+} bmp_info_t;
+
 #endif