diff --git a/src/adiv5_swdp.c b/src/adiv5_swdp.c
index b6e8d28..f88b283 100644
--- a/src/adiv5_swdp.c
+++ b/src/adiv5_swdp.c
@@ -63,6 +63,7 @@ int adiv5_swdp_scan(void)
 	swdptap_seq_out(0b10100101, 8);
 	ack = swdptap_seq_in(3);
 	if((ack != SWDP_ACK_OK) || swdptap_seq_in_parity(&dp->idcode, 32)) {
+		DEBUG("\n");
 		morse("NO TARGETS.", 1);
 		free(dp);
 		return -1;
diff --git a/src/linux/Makefile.inc b/src/linux/Makefile.inc
new file mode 100644
index 0000000..0968764
--- /dev/null
+++ b/src/linux/Makefile.inc
@@ -0,0 +1 @@
+LDFLAGS = -lftdi
diff --git a/src/linux/gdb_if.c b/src/linux/gdb_if.c
new file mode 100644
index 0000000..1fb3491
--- /dev/null
+++ b/src/linux/gdb_if.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011  Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This file implements a transparent channel over which the GDB Remote
+ * Serial Debugging protocol is implemented.  This implementation for Linux
+ * uses a TCP server on port 2000.
+ */
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <sys/select.h>
+
+#include <assert.h>
+
+#include "general.h"
+#include "gdb_if.h"
+
+static int gdb_if_serv, gdb_if_conn;
+
+int gdb_if_init(void)
+{
+	struct sockaddr_in addr;
+
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(2000);
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+	assert((gdb_if_serv = socket(PF_INET, SOCK_STREAM, 0)) != -1);
+	assert(bind(gdb_if_serv, (void*)&addr, sizeof(addr)) != -1);
+	assert(listen(gdb_if_serv, 1) != -1);
+
+	DEBUG("Listening on TCP:2000\n");
+
+	return 0;
+}
+
+
+unsigned char gdb_if_getchar(void)
+{
+	unsigned char ret;
+	int i = 0;
+
+	while(i <= 0) {
+		if(gdb_if_conn <= 0) {
+			gdb_if_conn = accept(gdb_if_serv, NULL, NULL);
+			DEBUG("Got connection\n");
+		}
+		i = recv(gdb_if_conn, &ret, 1, 0);
+		if(i <= 0) {
+			gdb_if_conn = -1;
+			DEBUG("Dropped broken connection\n");
+			/* Return '+' in case we were waiting for an ACK */
+			return '+';
+		}
+	}
+	return ret;
+}
+
+unsigned char gdb_if_getchar_to(int timeout)
+{
+	fd_set fds;
+	struct timeval tv;
+
+	if(gdb_if_conn == -1) return -1;
+
+	tv.tv_sec = timeout / 1000;
+	tv.tv_usec = (timeout % 1000) * 1000;
+
+	FD_ZERO(&fds);
+	FD_SET(gdb_if_conn, &fds);
+
+	if(select(gdb_if_conn+1, &fds, NULL, NULL, &tv) > 0)
+		return gdb_if_getchar();
+
+	return -1;
+}
+
+void gdb_if_putchar(unsigned char c, int flush)
+{
+	if(gdb_if_conn > 0) 
+		send(gdb_if_conn, &c, 1, 0);
+}
+
diff --git a/src/linux/jtagtap.c b/src/linux/jtagtap.c
new file mode 100644
index 0000000..a8f06a9
--- /dev/null
+++ b/src/linux/jtagtap.c
@@ -0,0 +1,255 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2008  Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Low level JTAG implementation using FT2232 with libftdi.
+ *
+ * Issues:
+ * This code is old, rotten and unsupported.
+ * Magic numbers everywhere.
+ * Should share interface with swdptap.c or at least clean up...
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <assert.h>
+#include <alloca.h>
+
+#include <ftdi.h>
+
+#include "general.h"
+
+#define PROVIDE_GENERIC_TAP_SEQ
+//#define PROVIDE_GENERIC_TAP_TMS_SEQ
+//#define PROVIDE_GENERIC_TAP_TDI_TDO_SEQ
+//#define PROVIDE_GENERIC_TAP_TDI_SEQ
+#include "jtagtap.h"
+
+#define ALL_ZERO 0xA0
+#define TCK 	0x01
+#define TDI 	0x02
+#define TDO 	0x04
+#define TMS 	0x08
+#define nSRST 	0x20
+
+static struct ftdi_context ftdic;
+static int f;
+
+#define BUF_SIZE 4096
+static uint8_t outbuf[BUF_SIZE];
+static uint16_t bufptr = 0;
+
+static void buffer_flush(void)
+{
+	assert(ftdi_write_data(&ftdic, outbuf, bufptr) == bufptr);
+//	printf("FT2232 buffer flush: %d bytes\n", bufptr);
+	bufptr = 0;
+}
+
+static int buffer_write(const uint8_t *data, int size)
+{
+	if((bufptr + size) / BUF_SIZE > 0) buffer_flush();
+	memcpy(outbuf + bufptr, data, size);
+	bufptr += size;
+	return size;
+}
+
+static int buffer_read(uint8_t *data, int size)
+{
+	int index = 0;
+	buffer_flush();
+	while((index += ftdi_read_data(&ftdic, data + index, size-index)) != size);
+	return size;
+}
+
+
+int jtagtap_init(void)
+{
+	ftdi_init(&ftdic);
+	ftdi_set_interface(&ftdic, INTERFACE_A);
+	f = ftdi_usb_open(&ftdic, FT2232_VID, FT2232_PID);
+	if(f < 0 && f != -5) {
+		fprintf(stderr, "unable to open ftdi device: %d (%s)\n", 
+			f, ftdi_get_error_string(&ftdic));
+		return -1;
+	}
+	fprintf(stderr, "ftdi open succeeded(channel 1): %d\n",f);
+
+	ftdi_set_latency_timer(&ftdic, 1);
+	ftdi_set_baudrate(&ftdic, 480000000);
+	ftdi_usb_purge_buffers(&ftdic);
+
+	fprintf(stderr, "enabling bitbang mode(channel 1)\n");
+	assert(ftdi_set_bitmode(&ftdic, 0xAB, BITMODE_MPSSE) == 0);
+	assert(ftdi_write_data(&ftdic, "\x86\x00\x00\x80\xA8\xAB", 6) == 6);
+	ftdi_write_data_set_chunksize(&ftdic, BUF_SIZE);
+
+	return 0;
+}
+
+void jtagtap_reset(void)
+{
+	jtagtap_soft_reset();
+}
+
+void jtagtap_srst(void)
+{
+	buffer_flush();
+	//ftdi_write_data(&ftdic, "\x80\x88\xAB", 3);
+	//usleep(1000);
+	//ftdi_write_data(&ftdic, "\x80\xA8\xAB", 3);
+}
+
+#ifndef PROVIDE_GENERIC_TAP_TMS_SEQ
+void
+jtagtap_tms_seq(uint32_t MS, int ticks)
+{
+	uint8_t tmp[3] = "\x4B";
+	while(ticks >= 0) {
+		//jtagtap_next(MS & 1, 1);
+		tmp[1] = ticks<7?ticks-1:6;
+		tmp[2] = 0x80 | (MS & 0x7F);
+		
+//		assert(ftdi_write_data(&ftdic, tmp, 3) == 3);
+		buffer_write(tmp, 3);
+		MS >>= 7; ticks -= 7;
+	}
+}
+#endif
+
+#ifndef PROVIDE_GENERIC_TAP_TDI_SEQ
+void 
+jtagtap_tdi_seq(const uint8_t final_tms, const uint8_t *DI, int ticks)
+{
+	char *tmp;
+	int index = 0;
+	int rticks;
+
+	if(!ticks) return;
+
+	if(final_tms) ticks--;
+	rticks = ticks & 7;
+	ticks >>= 3;
+	tmp = alloca(ticks + 9);
+
+	if(ticks) {
+		tmp[index++] = 0x19;
+		tmp[index++] = ticks - 1;
+		tmp[index++] = 0;
+		while(ticks--) tmp[index++] = *DI++;
+	}
+
+	if(rticks) {
+		tmp[index++] = 0x1B;
+		tmp[index++] = rticks - 1;
+		tmp[index++] = *DI;
+	}
+	
+	if(final_tms) {
+		tmp[index++] = 0x4B;
+		tmp[index++] = 0;
+		tmp[index++] = (*DI)>>rticks?0x81:0x01;
+	}
+//	assert(ftdi_write_data(&ftdic, tmp, index) == index);
+	buffer_write(tmp, index);
+}
+#endif
+
+#ifndef PROVIDE_GENERIC_TAP_TDI_TDO_SEQ
+void 
+jtagtap_tdi_tdo_seq(uint8_t *DO, const uint8_t final_tms, const uint8_t *DI, int ticks)
+{
+	uint8_t *tmp;
+	int index = 0, rsize;
+	int rticks;
+
+	if(!ticks) return;
+
+//	printf("ticks: %d\n", ticks);
+	if(final_tms) ticks--;
+	rticks = ticks & 7;
+	ticks >>= 3;
+	tmp = alloca(ticks + 9);
+	rsize = ticks;
+	if(ticks) {
+		tmp[index++] = 0x39;
+		tmp[index++] = ticks - 1;
+		tmp[index++] = 0;
+		while(ticks--) tmp[index++] = *DI++;
+	}
+
+	if(rticks) {
+		rsize++;
+		tmp[index++] = 0x3B;
+		tmp[index++] = rticks - 1;
+		tmp[index++] = *DI;
+	}
+	
+	if(final_tms) {
+		rsize++;
+		tmp[index++] = 0x6B;
+		tmp[index++] = 0;
+		tmp[index++] = (*DI)>>rticks?0x81:0x01;
+	}
+//	assert(ftdi_write_data(&ftdic, tmp, index) == index);
+	buffer_write(tmp, index);
+//	index = 0;
+//	while((index += ftdi_read_data(&ftdic, tmp + index, rsize-index)) != rsize);
+	buffer_read(tmp, rsize);
+	/*for(index = 0; index < rsize; index++)
+		printf("%02X ", tmp[index]);
+	printf("\n");*/
+	index = 0;
+	if(final_tms) rsize--;
+	
+	while(rsize--) {
+		/*if(rsize) printf("%02X ", tmp[index]);*/
+		*DO++ = tmp[index++];
+	}
+	if(final_tms) {
+		rticks++;
+		*(--DO) >>= 1;
+		*DO |= tmp[index] & 0x80;
+	} else DO--;
+	if(rticks) {
+		*DO >>= (8-rticks);
+	}
+	/*printf("%02X\n", *DO);*/
+}
+#endif
+
+uint8_t jtagtap_next(uint8_t dTMS, uint8_t dTDO)
+{
+	uint8_t ret;
+	uint8_t tmp[3] = "\x6B\x00\x00";
+	tmp[2] = (dTDO?0x80:0) | (dTMS?0x01:0);
+//	assert(ftdi_write_data(&ftdic, tmp, 3) == 3);
+//	while(ftdi_read_data(&ftdic, &ret, 1) != 1);
+	buffer_write(tmp, 3);
+	buffer_read(&ret, 1);
+
+	ret &= 0x80;
+
+//	DEBUG("jtagtap_next(TMS = %d, TDO = %d) = %02X\n", dTMS, dTDO, ret);
+
+	return ret;
+}
+
diff --git a/src/linux/platform.c b/src/linux/platform.c
new file mode 100644
index 0000000..c18d8a6
--- /dev/null
+++ b/src/linux/platform.c
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011  Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "platform.h"
+
+int platform_init(void) { return 0; }
+
diff --git a/src/linux/platform.h b/src/linux/platform.h
new file mode 100644
index 0000000..866ffc6
--- /dev/null
+++ b/src/linux/platform.h
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011  Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PLATFORM_H
+#define __PLATFORM_H
+
+#include <stdint.h>
+
+#define FT2232_VID	0x0403
+#define FT2232_PID	0xbcd9
+
+#define SET_RUN_STATE(state)
+#define SET_IDLE_STATE(state)
+#define SET_ERROR_STATE(state)
+
+#define PLATFORM_FATAL_ERROR(error)	abort()
+#define PLATFORM_SET_FATAL_ERROR_RECOVERY()
+
+#define morse(x, y) do {} while(0)
+#define morse_msg 0
+
+int platform_init(void);
+
+#endif
+
diff --git a/src/linux/swdptap.c b/src/linux/swdptap.c
new file mode 100644
index 0000000..1185564
--- /dev/null
+++ b/src/linux/swdptap.c
@@ -0,0 +1,182 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011  Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Quick hack for bit-banging SW-DP interface over FT2232.
+ * Intended as proof of concept, not for production.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <ftdi.h>
+
+#include "platform.h"
+#include "swdptap.h"
+
+static struct ftdi_context ftdic;
+static int f;
+
+#define BUF_SIZE 4096
+
+int swdptap_init(void)
+{
+	ftdi_init(&ftdic);
+	ftdi_set_interface(&ftdic, INTERFACE_A);
+	f = ftdi_usb_open(&ftdic, FT2232_VID, FT2232_PID);
+	if(f < 0 && f != -5) {
+		fprintf(stderr, "unable to open ftdi device: %d (%s)\n", 
+			f, ftdi_get_error_string(&ftdic));
+		return -1;
+	}
+	printf("ftdi open succeeded(channel 1): %d\n",f);
+
+	ftdi_set_latency_timer(&ftdic, 1);
+	ftdi_set_baudrate(&ftdic, 10000000);
+	ftdi_usb_purge_buffers(&ftdic);
+
+	printf("enabling bitbang mode(channel 1)\n");
+	assert(ftdi_set_bitmode(&ftdic, 0xAB, BITMODE_BITBANG) == 0);
+	//assert(ftdi_write_data(&ftdic, "\x86\x00\x00\x80\xA8\xAB", 6) == 6);
+	ftdi_write_data(&ftdic, "\xAB\xA8", 2);
+	ftdi_write_data_set_chunksize(&ftdic, BUF_SIZE);
+
+	/* This must be investigated in more detail.
+	 * As described in STM32 Reference Manual... */
+	swdptap_reset();
+	swdptap_seq_out(0xE79E, 16); /* 0b0111100111100111 */ 
+	swdptap_reset();
+	swdptap_seq_out(0, 16); 
+
+	return 0;
+}
+
+void swdptap_reset(void)
+{
+        swdptap_turnaround(0);
+        /* 50 clocks with TMS high */
+        for(int i = 0; i < 50; i++) swdptap_bit_out(1);
+}
+
+void swdptap_turnaround(uint8_t dir)
+{
+	static uint8_t olddir = 0;
+
+        DEBUG("%s", dir ? "\n-> ":"\n<- ");
+
+	if(dir == olddir) return;
+	olddir = dir;
+
+	if(dir)	/* SWDIO goes to input */
+		assert(ftdi_set_bitmode(&ftdic, 0xA3, BITMODE_BITBANG) == 0);
+
+	/* One clock cycle */
+	ftdi_write_data(&ftdic, "\xAB\xA8", 2);
+
+	if(!dir) /* SWDIO goes to output */
+		assert(ftdi_set_bitmode(&ftdic, 0xAB, BITMODE_BITBANG) == 0);
+}
+
+uint8_t swdptap_bit_in(void) 
+{
+	uint8_t ret;
+
+	//ftdi_read_data(&ftdic, &ret, 1);
+	ftdi_read_pins(&ftdic, &ret);
+	//ret &= 0x08;
+	ftdi_write_data(&ftdic, "\xA1\xA0", 2);
+
+	DEBUG("%x\n", ret);
+
+	return ret & 0x08;
+}
+
+void swdptap_bit_out(uint8_t val)
+{
+	uint8_t buf[3] = "\xA0\xA1\xA0";
+
+	DEBUG("%d", val);
+
+	if(val) {
+		for(int i = 0; i < 3; i++)
+			buf[i] |= 0x08;
+	}
+	ftdi_write_data(&ftdic, buf, 3);
+}
+
+uint32_t swdptap_seq_in(int ticks)
+{
+	uint32_t index = 1;
+	uint32_t ret = 0;
+
+	swdptap_turnaround(1);
+
+	while (ticks--) {
+		if (swdptap_bit_in())
+			ret |= index;
+		index <<= 1;
+	}
+
+	return ret;
+}
+
+uint8_t swdptap_seq_in_parity(uint32_t *ret, int ticks)
+{
+	uint32_t index = 1;
+	uint8_t parity = 0;
+	*ret = 0;
+
+	swdptap_turnaround(1);
+
+	while (ticks--) {
+		if (swdptap_bit_in()) {
+			*ret |= index;
+			parity ^= 1;
+		}
+		index <<= 1;
+	}
+	if (swdptap_bit_in())
+		parity ^= 1;
+
+	return parity;
+}
+
+void swdptap_seq_out(uint32_t MS, int ticks)
+{
+	swdptap_turnaround(0);
+
+	while (ticks--) {
+		swdptap_bit_out(MS & 1);
+		MS >>= 1;
+	}
+}
+
+void swdptap_seq_out_parity(uint32_t MS, int ticks)
+{
+	uint8_t parity = 0;
+
+	swdptap_turnaround(0);
+
+	while (ticks--) {
+		swdptap_bit_out(MS & 1);
+		parity ^= MS;
+		MS >>= 1;
+	}
+	swdptap_bit_out(parity & 1);
+}
+