X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e3ae0257834f7d134c7f80db6fa23668b5a5fa6d..5b1311fba2d422b0c4549097f8e9e0c635b1d9e1:/armsrc/fpgaloader.c

diff --git a/armsrc/fpgaloader.c b/armsrc/fpgaloader.c
index 58385588..077b378a 100644
--- a/armsrc/fpgaloader.c
+++ b/armsrc/fpgaloader.c
@@ -1,363 +1,460 @@
-//-----------------------------------------------------------------------------
-// Routines to load the FPGA image, and then to configure the FPGA's major
-// mode once it is configured.
-//
-// Jonathan Westhues, April 2006
-//-----------------------------------------------------------------------------
-#include <proxmark3.h>
-#include "apps.h"
-
-//-----------------------------------------------------------------------------
-// Set up the Serial Peripheral Interface as master
-// Used to write the FPGA config word
-// May also be used to write to other SPI attached devices like an LCD
-//-----------------------------------------------------------------------------
-void SetupSpi(int mode)
-{
-	// PA10 -> SPI_NCS2 chip select (LCD)
-	// PA11 -> SPI_NCS0 chip select (FPGA)
-	// PA12 -> SPI_MISO Master-In Slave-Out
-	// PA13 -> SPI_MOSI Master-Out Slave-In
-	// PA14 -> SPI_SPCK Serial Clock
-
-	// Disable PIO control of the following pins, allows use by the SPI peripheral
-	PIO_DISABLE			 =	(1 << GPIO_NCS0)	|
-							(1 << GPIO_NCS2) 	|
-							(1 << GPIO_MISO)	|
-							(1 << GPIO_MOSI)	|
-							(1 << GPIO_SPCK);
-
-	PIO_PERIPHERAL_A_SEL =	(1 << GPIO_NCS0)	|
-							(1 << GPIO_MISO)	|
-							(1 << GPIO_MOSI)	|
-							(1 << GPIO_SPCK);
-
-	PIO_PERIPHERAL_B_SEL =	(1 << GPIO_NCS2);
-
-	//enable the SPI Peripheral clock
-	PMC_PERIPHERAL_CLK_ENABLE = (1<<PERIPH_SPI);
-	// Enable SPI
-	SPI_CONTROL = SPI_CONTROL_ENABLE;
-
-	switch (mode) {
-		case SPI_FPGA_MODE:
-			SPI_MODE =
-				( 0 << 24)	|	// Delay between chip selects (take default: 6 MCK periods)
-				(14 << 16)	|	// Peripheral Chip Select (selects FPGA SPI_NCS0 or PA11)
-				( 0 << 7)	|	// Local Loopback Disabled
-				( 1 << 4)	|	// Mode Fault Detection disabled
-				( 0 << 2)	|	// Chip selects connected directly to peripheral
-				( 0 << 1) 	|	// Fixed Peripheral Select
-				( 1 << 0);		// Master Mode
-			SPI_FOR_CHIPSEL_0 =
-				( 1 << 24)	|	// Delay between Consecutive Transfers (32 MCK periods)
-				( 1 << 16)	|	// Delay Before SPCK (1 MCK period)
-				( 6 << 8)	|	// Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
-				( 8 << 4)	|	// Bits per Transfer (16 bits)
-				( 0 << 3)	|	// Chip Select inactive after transfer
-				( 1 << 1)	|	// Clock Phase data captured on leading edge, changes on following edge
-				( 0 << 0);		// Clock Polarity inactive state is logic 0
-			break;
-		case SPI_LCD_MODE:
-			SPI_MODE =
-				( 0 << 24)	|	// Delay between chip selects (take default: 6 MCK periods)
-				(11 << 16)	|	// Peripheral Chip Select (selects LCD SPI_NCS2 or PA10)
-				( 0 << 7)	|	// Local Loopback Disabled
-				( 1 << 4)	|	// Mode Fault Detection disabled
-				( 0 << 2)	|	// Chip selects connected directly to peripheral
-				( 0 << 1) 	|	// Fixed Peripheral Select
-				( 1 << 0);		// Master Mode
-			SPI_FOR_CHIPSEL_2 =
-				( 1 << 24)	|	// Delay between Consecutive Transfers (32 MCK periods)
-				( 1 << 16)	|	// Delay Before SPCK (1 MCK period)
-				( 6 << 8)	|	// Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
-				( 1 << 4)	|	// Bits per Transfer (9 bits)
-				( 0 << 3)	|	// Chip Select inactive after transfer
-				( 1 << 1)	|	// Clock Phase data captured on leading edge, changes on following edge
-				( 0 << 0);		// Clock Polarity inactive state is logic 0
-			break;
-		default:				// Disable SPI
-			SPI_CONTROL = SPI_CONTROL_DISABLE;
-			break;
-	}
-}
-
-//-----------------------------------------------------------------------------
-// Set up the synchronous serial port, with the one set of options that we
-// always use when we are talking to the FPGA. Both RX and TX are enabled.
-//-----------------------------------------------------------------------------
-void FpgaSetupSsc(void)
-{
-	// First configure the GPIOs, and get ourselves a clock.
-	PIO_PERIPHERAL_A_SEL =	(1 << GPIO_SSC_FRAME)	|
-							(1 << GPIO_SSC_DIN)		|
-							(1 << GPIO_SSC_DOUT)	|
-							(1 << GPIO_SSC_CLK);
-	PIO_DISABLE = (1 << GPIO_SSC_DOUT);
-
-	PMC_PERIPHERAL_CLK_ENABLE = (1 << PERIPH_SSC);
-
-	// Now set up the SSC proper, starting from a known state.
-	SSC_CONTROL = SSC_CONTROL_RESET;
-
-	// RX clock comes from TX clock, RX starts when TX starts, data changes
-	// on RX clock rising edge, sampled on falling edge
-	SSC_RECEIVE_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(1) | SSC_CLOCK_MODE_START(1);
-
-	// 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
-	// pulse, no output sync, start on positive-going edge of sync
-	SSC_RECEIVE_FRAME_MODE = SSC_FRAME_MODE_BITS_IN_WORD(8) |
-		SSC_FRAME_MODE_MSB_FIRST | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
-
-	// clock comes from TK pin, no clock output, outputs change on falling
-	// edge of TK, start on rising edge of TF
-	SSC_TRANSMIT_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(2) |
-		SSC_CLOCK_MODE_START(5);
-
-	// tx framing is the same as the rx framing
-	SSC_TRANSMIT_FRAME_MODE = SSC_RECEIVE_FRAME_MODE;
-
-	SSC_CONTROL = SSC_CONTROL_RX_ENABLE | SSC_CONTROL_TX_ENABLE;
-}
-
-//-----------------------------------------------------------------------------
-// Set up DMA to receive samples from the FPGA. We will use the PDC, with
-// a single buffer as a circular buffer (so that we just chain back to
-// ourselves, not to another buffer). The stuff to manipulate those buffers
-// is in apps.h, because it should be inlined, for speed.
-//-----------------------------------------------------------------------------
-void FpgaSetupSscDma(BYTE *buf, int len)
-{
-	PDC_RX_POINTER(SSC_BASE) = (DWORD)buf;
-	PDC_RX_COUNTER(SSC_BASE) = len;
-	PDC_RX_NEXT_POINTER(SSC_BASE) = (DWORD)buf;
-	PDC_RX_NEXT_COUNTER(SSC_BASE) = len;
-	PDC_CONTROL(SSC_BASE) = PDC_RX_ENABLE;
-}
-
-// Download the fpga image starting at FpgaImage and with length FpgaImageLen DWORDs (e.g. 4 bytes)
-// If bytereversal is set: reverse the byte order in each 4-byte word
-static void DownloadFPGA(const DWORD *FpgaImage, DWORD FpgaImageLen, int bytereversal)
-{
-	int i, j;
-
-	PIO_OUTPUT_ENABLE = (1 << GPIO_FPGA_ON);
-	PIO_ENABLE = (1 << GPIO_FPGA_ON);
-	PIO_OUTPUT_DATA_SET = (1 << GPIO_FPGA_ON);
-
-	SpinDelay(50);
-
-	LED_D_ON();
-
-	HIGH(GPIO_FPGA_NPROGRAM);
-	LOW(GPIO_FPGA_CCLK);
-	LOW(GPIO_FPGA_DIN);
-	PIO_OUTPUT_ENABLE = (1 << GPIO_FPGA_NPROGRAM)	|
-						(1 << GPIO_FPGA_CCLK)		|
-						(1 << GPIO_FPGA_DIN);
-	SpinDelay(1);
-
-	LOW(GPIO_FPGA_NPROGRAM);
-	SpinDelay(50);
-	HIGH(GPIO_FPGA_NPROGRAM);
-
-	for(i = 0; i < FpgaImageLen; i++) {
-		DWORD v = FpgaImage[i];
-		unsigned char w;
-		for(j = 0; j < 4; j++) {
-			if(!bytereversal) 
-				w = v >>(j*8);
-			else
-				w = v >>((3-j)*8);
-#define SEND_BIT(x) { if(w & (1<<x) ) HIGH(GPIO_FPGA_DIN); else LOW(GPIO_FPGA_DIN); HIGH(GPIO_FPGA_CCLK); LOW(GPIO_FPGA_CCLK); }
-			SEND_BIT(7);
-			SEND_BIT(6);
-			SEND_BIT(5);
-			SEND_BIT(4);
-			SEND_BIT(3);
-			SEND_BIT(2);
-			SEND_BIT(1);
-			SEND_BIT(0);
-		}
-	}
-
-	LED_D_OFF();
-}
-
-static char *bitparse_headers_start;
-static char *bitparse_bitstream_end;
-static int bitparse_initialized;
-/* Simple Xilinx .bit parser. The file starts with the fixed opaque byte sequence
- * 00 09 0f f0 0f f0 0f f0 0f f0 00 00 01
- * After that the format is 1 byte section type (ASCII character), 2 byte length
- * (big endian), <length> bytes content. Except for section 'e' which has 4 bytes
+//-----------------------------------------------------------------------------
+// Jonathan Westhues, April 2006
+// iZsh <izsh at fail0verflow.com>, 2014
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Routines to load the FPGA image, and then to configure the FPGA's major
+// mode once it is configured.
+//-----------------------------------------------------------------------------
+#include "proxmark3.h"
+#include "apps.h"
+#include "util.h"
+#include "string.h"
+
+//-----------------------------------------------------------------------------
+// Set up the Serial Peripheral Interface as master
+// Used to write the FPGA config word
+// May also be used to write to other SPI attached devices like an LCD
+//-----------------------------------------------------------------------------
+void SetupSpi(int mode)
+{
+	// PA10 -> SPI_NCS2 chip select (LCD)
+	// PA11 -> SPI_NCS0 chip select (FPGA)
+	// PA12 -> SPI_MISO Master-In Slave-Out
+	// PA13 -> SPI_MOSI Master-Out Slave-In
+	// PA14 -> SPI_SPCK Serial Clock
+
+	// Disable PIO control of the following pins, allows use by the SPI peripheral
+	AT91C_BASE_PIOA->PIO_PDR =
+		GPIO_NCS0	|
+		GPIO_NCS2 	|
+		GPIO_MISO	|
+		GPIO_MOSI	|
+		GPIO_SPCK;
+
+	AT91C_BASE_PIOA->PIO_ASR =
+		GPIO_NCS0	|
+		GPIO_MISO	|
+		GPIO_MOSI	|
+		GPIO_SPCK;
+
+	AT91C_BASE_PIOA->PIO_BSR = GPIO_NCS2;
+
+	//enable the SPI Peripheral clock
+	AT91C_BASE_PMC->PMC_PCER = (1<<AT91C_ID_SPI);
+	// Enable SPI
+	AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SPIEN;
+
+	switch (mode) {
+		case SPI_FPGA_MODE:
+			AT91C_BASE_SPI->SPI_MR =
+				( 0 << 24)	|	// Delay between chip selects (take default: 6 MCK periods)
+				(14 << 16)	|	// Peripheral Chip Select (selects FPGA SPI_NCS0 or PA11)
+				( 0 << 7)	|	// Local Loopback Disabled
+				( 1 << 4)	|	// Mode Fault Detection disabled
+				( 0 << 2)	|	// Chip selects connected directly to peripheral
+				( 0 << 1) 	|	// Fixed Peripheral Select
+				( 1 << 0);		// Master Mode
+			AT91C_BASE_SPI->SPI_CSR[0] =
+				( 1 << 24)	|	// Delay between Consecutive Transfers (32 MCK periods)
+				( 1 << 16)	|	// Delay Before SPCK (1 MCK period)
+				( 6 << 8)	|	// Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
+				( 8 << 4)	|	// Bits per Transfer (16 bits)
+				( 0 << 3)	|	// Chip Select inactive after transfer
+				( 1 << 1)	|	// Clock Phase data captured on leading edge, changes on following edge
+				( 0 << 0);		// Clock Polarity inactive state is logic 0
+			break;
+		case SPI_LCD_MODE:
+			AT91C_BASE_SPI->SPI_MR =
+				( 0 << 24)	|	// Delay between chip selects (take default: 6 MCK periods)
+				(11 << 16)	|	// Peripheral Chip Select (selects LCD SPI_NCS2 or PA10)
+				( 0 << 7)	|	// Local Loopback Disabled
+				( 1 << 4)	|	// Mode Fault Detection disabled
+				( 0 << 2)	|	// Chip selects connected directly to peripheral
+				( 0 << 1) 	|	// Fixed Peripheral Select
+				( 1 << 0);		// Master Mode
+			AT91C_BASE_SPI->SPI_CSR[2] =
+				( 1 << 24)	|	// Delay between Consecutive Transfers (32 MCK periods)
+				( 1 << 16)	|	// Delay Before SPCK (1 MCK period)
+				( 6 << 8)	|	// Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
+				( 1 << 4)	|	// Bits per Transfer (9 bits)
+				( 0 << 3)	|	// Chip Select inactive after transfer
+				( 1 << 1)	|	// Clock Phase data captured on leading edge, changes on following edge
+				( 0 << 0);		// Clock Polarity inactive state is logic 0
+			break;
+		default:				// Disable SPI
+			AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SPIDIS;
+			break;
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Set up the synchronous serial port, with the one set of options that we
+// always use when we are talking to the FPGA. Both RX and TX are enabled.
+//-----------------------------------------------------------------------------
+void FpgaSetupSsc(void)
+{
+	// First configure the GPIOs, and get ourselves a clock.
+	AT91C_BASE_PIOA->PIO_ASR =
+		GPIO_SSC_FRAME	|
+		GPIO_SSC_DIN	|
+		GPIO_SSC_DOUT	|
+		GPIO_SSC_CLK;
+	AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DOUT;
+
+	AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_SSC);
+
+	// Now set up the SSC proper, starting from a known state.
+	AT91C_BASE_SSC->SSC_CR = AT91C_SSC_SWRST;
+
+	// RX clock comes from TX clock, RX starts when TX starts, data changes
+	// on RX clock rising edge, sampled on falling edge
+	AT91C_BASE_SSC->SSC_RCMR = SSC_CLOCK_MODE_SELECT(1) | SSC_CLOCK_MODE_START(1);
+
+	// 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
+	// pulse, no output sync
+	AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) |	AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
+
+	// clock comes from TK pin, no clock output, outputs change on falling
+	// edge of TK, sample on rising edge of TK, start on positive-going edge of sync
+	AT91C_BASE_SSC->SSC_TCMR = SSC_CLOCK_MODE_SELECT(2) |	SSC_CLOCK_MODE_START(5);
+
+	// tx framing is the same as the rx framing
+	AT91C_BASE_SSC->SSC_TFMR = AT91C_BASE_SSC->SSC_RFMR;
+
+	AT91C_BASE_SSC->SSC_CR = AT91C_SSC_RXEN | AT91C_SSC_TXEN;
+}
+
+//-----------------------------------------------------------------------------
+// Set up DMA to receive samples from the FPGA. We will use the PDC, with
+// a single buffer as a circular buffer (so that we just chain back to
+// ourselves, not to another buffer). The stuff to manipulate those buffers
+// is in apps.h, because it should be inlined, for speed.
+//-----------------------------------------------------------------------------
+bool FpgaSetupSscDma(uint8_t *buf, int len)
+{
+	if (buf == NULL) {
+        return false;
+    }
+
+	AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;	// Disable DMA Transfer
+	AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf;		// transfer to this memory address
+	AT91C_BASE_PDC_SSC->PDC_RCR = len;					// transfer this many bytes
+	AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf;		// next transfer to same memory address
+	AT91C_BASE_PDC_SSC->PDC_RNCR = len;					// ... with same number of bytes
+	AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN;		// go!
+    
+    return true;
+}
+
+static void DownloadFPGA_byte(unsigned char w)
+{
+#define SEND_BIT(x) { if(w & (1<<x) ) HIGH(GPIO_FPGA_DIN); else LOW(GPIO_FPGA_DIN); HIGH(GPIO_FPGA_CCLK); LOW(GPIO_FPGA_CCLK); }
+	SEND_BIT(7);
+	SEND_BIT(6);
+	SEND_BIT(5);
+	SEND_BIT(4);
+	SEND_BIT(3);
+	SEND_BIT(2);
+	SEND_BIT(1);
+	SEND_BIT(0);
+}
+
+// Download the fpga image starting at FpgaImage and with length FpgaImageLen bytes
+// If bytereversal is set: reverse the byte order in each 4-byte word
+static void DownloadFPGA(const char *FpgaImage, int FpgaImageLen, int bytereversal)
+{
+	int i=0;
+
+	AT91C_BASE_PIOA->PIO_OER = GPIO_FPGA_ON;
+	AT91C_BASE_PIOA->PIO_PER = GPIO_FPGA_ON;
+	HIGH(GPIO_FPGA_ON);		// ensure everything is powered on
+
+	SpinDelay(50);
+
+	LED_D_ON();
+
+	// These pins are inputs
+    AT91C_BASE_PIOA->PIO_ODR =
+    	GPIO_FPGA_NINIT |
+    	GPIO_FPGA_DONE;
+	// PIO controls the following pins
+    AT91C_BASE_PIOA->PIO_PER =
+    	GPIO_FPGA_NINIT |
+    	GPIO_FPGA_DONE;
+	// Enable pull-ups
+	AT91C_BASE_PIOA->PIO_PPUER =
+		GPIO_FPGA_NINIT |
+		GPIO_FPGA_DONE;
+
+	// setup initial logic state
+	HIGH(GPIO_FPGA_NPROGRAM);
+	LOW(GPIO_FPGA_CCLK);
+	LOW(GPIO_FPGA_DIN);
+	// These pins are outputs
+	AT91C_BASE_PIOA->PIO_OER =
+		GPIO_FPGA_NPROGRAM	|
+		GPIO_FPGA_CCLK		|
+		GPIO_FPGA_DIN;
+
+	// enter FPGA configuration mode
+	LOW(GPIO_FPGA_NPROGRAM);
+	SpinDelay(50);
+	HIGH(GPIO_FPGA_NPROGRAM);
+
+	i=100000;
+	// wait for FPGA ready to accept data signal
+	while ((i) && ( !(AT91C_BASE_PIOA->PIO_PDSR & GPIO_FPGA_NINIT ) ) ) {
+		i--;
+	}
+
+	// crude error indicator, leave both red LEDs on and return
+	if (i==0){
+		LED_C_ON();
+		LED_D_ON();
+		return;
+	}
+
+	if(bytereversal) {
+		/* This is only supported for uint32_t aligned images */
+		if( ((int)FpgaImage % sizeof(uint32_t)) == 0 ) {
+			i=0;
+			while(FpgaImageLen-->0)
+				DownloadFPGA_byte(FpgaImage[(i++)^0x3]);
+			/* Explanation of the magic in the above line:
+			 * i^0x3 inverts the lower two bits of the integer i, counting backwards
+			 * for each 4 byte increment. The generated sequence of (i++)^3 is
+			 * 3 2 1 0 7 6 5 4 11 10 9 8 15 14 13 12 etc. pp.
+			 */
+		}
+	} else {
+		while(FpgaImageLen-->0)
+			DownloadFPGA_byte(*FpgaImage++);
+	}
+
+	// continue to clock FPGA until ready signal goes high
+	i=100000;
+	while ( (i--) && ( !(AT91C_BASE_PIOA->PIO_PDSR & GPIO_FPGA_DONE ) ) ) {
+		HIGH(GPIO_FPGA_CCLK);
+		LOW(GPIO_FPGA_CCLK);
+	}
+	// crude error indicator, leave both red LEDs on and return
+	if (i==0){
+		LED_C_ON();
+		LED_D_ON();
+		return;
+	}
+	LED_D_OFF();
+}
+
+static char *bitparse_headers_start;
+static char *bitparse_bitstream_end;
+static int bitparse_initialized = 0;
+/* Simple Xilinx .bit parser. The file starts with the fixed opaque byte sequence
+ * 00 09 0f f0 0f f0 0f f0 0f f0 00 00 01
+ * After that the format is 1 byte section type (ASCII character), 2 byte length
+ * (big endian), <length> bytes content. Except for section 'e' which has 4 bytes
  * length.
- */
-static const char _bitparse_fixed_header[] = {0x00, 0x09, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x00, 0x00, 0x01};
-static int bitparse_init(void * start_address, void *end_address)
-{
-	bitparse_initialized = 0;
-	
-	if(memcmp(_bitparse_fixed_header, start_address, sizeof(_bitparse_fixed_header)) != 0) {
-		return 0; /* Not matched */
-	} else {
-		bitparse_headers_start= ((char*)start_address) + sizeof(_bitparse_fixed_header);
-		bitparse_bitstream_end= (char*)end_address;
-		bitparse_initialized = 1;
-		return 1;
-	}
-}
-
-int bitparse_find_section(char section_name, void **section_start, unsigned int *section_length)
-{
-	char *pos = bitparse_headers_start;
-	int result = 0;
-
-	if(!bitparse_initialized) return 0;
-
-	while(pos < bitparse_bitstream_end) {
-		char current_name = *pos++;
-		unsigned int current_length = 0;
-		if(current_name < 'a' || current_name > 'e') {
-			/* Strange section name, abort */
-			break;
-		}
-		current_length = 0;
-		switch(current_name) {
-		case 'e':
-			/* Four byte length field */
-			current_length += (*pos++) << 24;
-			current_length += (*pos++) << 16;
-		default: /* Fall through, two byte length field */
-			current_length += (*pos++) << 8;
-			current_length += (*pos++) << 0;
-		}
-		
-		if(current_name != 'e' && current_length > 255) {
-			/* Maybe a parse error */
-			break;
-		}
-		
-		if(current_name == section_name) {
-			/* Found it */
-			*section_start = pos;
-			*section_length = current_length;
-			result = 1;
-			break;
-		}
-		
-		pos += current_length; /* Skip section */
-	}
-	
-	return result;
-}
-
-//-----------------------------------------------------------------------------
-// Find out which FPGA image format is stored in flash, then call DownloadFPGA
-// with the right parameters to download the image
-//-----------------------------------------------------------------------------
-extern char _binary_fpga_bit_start, _binary_fpga_bit_end;
-void FpgaDownloadAndGo(void)
-{
+ */
+static const char _bitparse_fixed_header[] = {0x00, 0x09, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x00, 0x00, 0x01};
+static int bitparse_init(void * start_address, void *end_address)
+{
+	bitparse_initialized = 0;
+
+	if(memcmp(_bitparse_fixed_header, start_address, sizeof(_bitparse_fixed_header)) != 0) {
+		return 0; /* Not matched */
+	} else {
+		bitparse_headers_start= ((char*)start_address) + sizeof(_bitparse_fixed_header);
+		bitparse_bitstream_end= (char*)end_address;
+		bitparse_initialized = 1;
+		return 1;
+	}
+}
+
+int bitparse_find_section(char section_name, char **section_start, unsigned int *section_length)
+{
+	char *pos = bitparse_headers_start;
+	int result = 0;
+
+	if(!bitparse_initialized) return 0;
+
+	while(pos < bitparse_bitstream_end) {
+		char current_name = *pos++;
+		unsigned int current_length = 0;
+		if(current_name < 'a' || current_name > 'e') {
+			/* Strange section name, abort */
+			break;
+		}
+		current_length = 0;
+		switch(current_name) {
+		case 'e':
+			/* Four byte length field */
+			current_length += (*pos++) << 24;
+			current_length += (*pos++) << 16;
+		default: /* Fall through, two byte length field */
+			current_length += (*pos++) << 8;
+			current_length += (*pos++) << 0;
+		}
+
+		if(current_name != 'e' && current_length > 255) {
+			/* Maybe a parse error */
+			break;
+		}
+
+		if(current_name == section_name) {
+			/* Found it */
+			*section_start = pos;
+			*section_length = current_length;
+			result = 1;
+			break;
+		}
+
+		pos += current_length; /* Skip section */
+	}
+
+	return result;
+}
+
+//-----------------------------------------------------------------------------
+// Find out which FPGA image format is stored in flash, then call DownloadFPGA
+// with the right parameters to download the image
+//-----------------------------------------------------------------------------
+extern char _binary_fpga_lf_bit_start, _binary_fpga_lf_bit_end;
+extern char _binary_fpga_hf_bit_start, _binary_fpga_hf_bit_end;
+void FpgaDownloadAndGo(int bitstream_version)
+{
+	void *bit_start;
+	void *bit_end;
+
+	// check whether or not the bitstream is already loaded
+	if (FpgaGatherBitstreamVersion() == bitstream_version)
+		return;
+
+	if (bitstream_version == FPGA_BITSTREAM_LF) {
+		bit_start = &_binary_fpga_lf_bit_start;
+		bit_end = &_binary_fpga_lf_bit_end;
+	} else if (bitstream_version == FPGA_BITSTREAM_HF) {
+		bit_start = &_binary_fpga_hf_bit_start;
+		bit_end = &_binary_fpga_hf_bit_end;
+	} else
+		return;
 	/* Check for the new flash image format: Should have the .bit file at &_binary_fpga_bit_start
-	 */
-	if(bitparse_init(&_binary_fpga_bit_start, &_binary_fpga_bit_end)) {
-		/* Successfully initialized the .bit parser. Find the 'e' section and
+	 */
+	if(bitparse_init(bit_start, bit_end)) {
+		/* Successfully initialized the .bit parser. Find the 'e' section and
 		 * send its contents to the FPGA.
-		 */
-		void *bitstream_start;
-		unsigned int bitstream_length;
-		if(bitparse_find_section('e', &bitstream_start, &bitstream_length)) {
-			DownloadFPGA((DWORD *)bitstream_start, bitstream_length/4, 0);
-			
-			return; /* All done */
-		}
-	}
-	
-	/* Fallback for the old flash image format: Check for the magic marker 0xFFFFFFFF
-	 * 0xAA995566 at address 0x102000. This is raw bitstream with a size of 336,768 bits 
-	 * = 10,524 DWORDs, stored as DWORDS e.g. little-endian in memory, but each DWORD
-	 * is still to be transmitted in MSBit first order. Set the invert flag to indicate
-	 * that the DownloadFPGA function should invert every 4 byte sequence when doing
+		 */
+		char *bitstream_start;
+		unsigned int bitstream_length;
+		if(bitparse_find_section('e', &bitstream_start, &bitstream_length)) {
+			DownloadFPGA(bitstream_start, bitstream_length, 0);
+
+			return; /* All done */
+		}
+	}
+
+	/* Fallback for the old flash image format: Check for the magic marker 0xFFFFFFFF
+	 * 0xAA995566 at address 0x102000. This is raw bitstream with a size of 336,768 bits
+	 * = 10,524 uint32_t, stored as uint32_t e.g. little-endian in memory, but each DWORD
+	 * is still to be transmitted in MSBit first order. Set the invert flag to indicate
+	 * that the DownloadFPGA function should invert every 4 byte sequence when doing
 	 * the bytewise download.
-	 */
-	if( *(DWORD*)0x102000 == 0xFFFFFFFF && *(DWORD*)0x102004 == 0xAA995566 )
-		DownloadFPGA((DWORD *)0x102000, 10524, 1);
-}
-
-void FpgaGatherVersion(char *dst, int len)
-{
-	char *fpga_info; 
-	unsigned int fpga_info_len;
-	dst[0] = 0;
-	if(!bitparse_find_section('e', (void**)&fpga_info, &fpga_info_len)) {
-		strncat(dst, "FPGA image: legacy image without version information", len-1);
-	} else {
-		strncat(dst, "FPGA image built", len-1);
-		/* USB packets only have 48 bytes data payload, so be terse */
-#if 0
-		if(bitparse_find_section('a', (void**)&fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
-			strncat(dst, " from ", len-1);
-			strncat(dst, fpga_info, len-1);
-		}
-		if(bitparse_find_section('b', (void**)&fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
-			strncat(dst, " for ", len-1);
-			strncat(dst, fpga_info, len-1);
-		}
-#endif
-		if(bitparse_find_section('c', (void**)&fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
-			strncat(dst, " on ", len-1);
-			strncat(dst, fpga_info, len-1);
-		}
-		if(bitparse_find_section('d', (void**)&fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
-			strncat(dst, " at ", len-1);
-			strncat(dst, fpga_info, len-1);
-		}
-	}
-}
-
-//-----------------------------------------------------------------------------
-// Send a 16 bit command/data pair to the FPGA.
-// The bit format is:  C3 C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
-// where C is the 4 bit command and D is the 12 bit data
-//-----------------------------------------------------------------------------
-void FpgaSendCommand(WORD cmd, WORD v)
-{
-	SetupSpi(SPI_FPGA_MODE);
-	while ((SPI_STATUS & SPI_STATUS_TX_EMPTY) == 0);		// wait for the transfer to complete
-	SPI_TX_DATA = SPI_CONTROL_LAST_TRANSFER | cmd | v;		// send the data
-}
-//-----------------------------------------------------------------------------
-// Write the FPGA setup word (that determines what mode the logic is in, read
-// vs. clone vs. etc.). This is now a special case of FpgaSendCommand() to
-// avoid changing this function's occurence everywhere in the source code.
-//-----------------------------------------------------------------------------
-void FpgaWriteConfWord(BYTE v)
-{
-	FpgaSendCommand(FPGA_CMD_SET_CONFREG, v);
-}
-
-//-----------------------------------------------------------------------------
-// Set up the CMOS switches that mux the ADC: four switches, independently
-// closable, but should only close one at a time. Not an FPGA thing, but
-// the samples from the ADC always flow through the FPGA.
-//-----------------------------------------------------------------------------
-void SetAdcMuxFor(int whichGpio)
-{
-	PIO_OUTPUT_ENABLE = (1 << GPIO_MUXSEL_HIPKD) |
-						(1 << GPIO_MUXSEL_LOPKD) |
-						(1 << GPIO_MUXSEL_LORAW) |
-						(1 << GPIO_MUXSEL_HIRAW);
-
-	PIO_ENABLE		=	(1 << GPIO_MUXSEL_HIPKD) |
-						(1 << GPIO_MUXSEL_LOPKD) |
-						(1 << GPIO_MUXSEL_LORAW) |
-						(1 << GPIO_MUXSEL_HIRAW);
-
-	LOW(GPIO_MUXSEL_HIPKD);
-	LOW(GPIO_MUXSEL_HIRAW);
-	LOW(GPIO_MUXSEL_LORAW);
-	LOW(GPIO_MUXSEL_LOPKD);
-
-	HIGH(whichGpio);
-}
+	 */
+	if( *(uint32_t*)0x102000 == 0xFFFFFFFF && *(uint32_t*)0x102004 == 0xAA995566 )
+		DownloadFPGA((char*)0x102000, 10524*4, 1);
+}
+
+int FpgaGatherBitstreamVersion()
+{
+	char temp[256];
+	FpgaGatherVersion(temp, sizeof (temp));
+	if (!memcmp("LF", temp, 2))
+		return FPGA_BITSTREAM_LF;
+	else if (!memcmp("HF", temp, 2))
+		return FPGA_BITSTREAM_HF;
+	return FPGA_BITSTREAM_ERR;
+}
+
+void FpgaGatherVersion(char *dst, int len)
+{
+	char *fpga_info;
+	unsigned int fpga_info_len;
+	dst[0] = 0;
+	if(!bitparse_find_section('e', &fpga_info, &fpga_info_len)) {
+		strncat(dst, "FPGA image: legacy image without version information", len-1);
+	} else {
+		/* USB packets only have 48 bytes data payload, so be terse */
+		if(bitparse_find_section('a', &fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
+			if (!memcmp("fpga_lf", fpga_info, 7))
+				strncat(dst, "LF ", len-1);
+			else if (!memcmp("fpga_hf", fpga_info, 7))
+				strncat(dst, "HF ", len-1);
+		}
+		strncat(dst, "FPGA image built", len-1);
+#if 0
+		if(bitparse_find_section('b', &fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
+			strncat(dst, " for ", len-1);
+			strncat(dst, fpga_info, len-1);
+		}
+#endif
+		if(bitparse_find_section('c', &fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
+			strncat(dst, " on ", len-1);
+			strncat(dst, fpga_info, len-1);
+		}
+		if(bitparse_find_section('d', &fpga_info, &fpga_info_len) && fpga_info[fpga_info_len-1] == 0 ) {
+			strncat(dst, " at ", len-1);
+			strncat(dst, fpga_info, len-1);
+		}
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Send a 16 bit command/data pair to the FPGA.
+// The bit format is:  C3 C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
+// where C is the 4 bit command and D is the 12 bit data
+//-----------------------------------------------------------------------------
+void FpgaSendCommand(uint16_t cmd, uint16_t v)
+{
+	SetupSpi(SPI_FPGA_MODE);
+	while ((AT91C_BASE_SPI->SPI_SR & AT91C_SPI_TXEMPTY) == 0);		// wait for the transfer to complete
+	AT91C_BASE_SPI->SPI_TDR = AT91C_SPI_LASTXFER | cmd | v;		// send the data
+}
+//-----------------------------------------------------------------------------
+// Write the FPGA setup word (that determines what mode the logic is in, read
+// vs. clone vs. etc.). This is now a special case of FpgaSendCommand() to
+// avoid changing this function's occurence everywhere in the source code.
+//-----------------------------------------------------------------------------
+void FpgaWriteConfWord(uint8_t v)
+{
+	FpgaSendCommand(FPGA_CMD_SET_CONFREG, v);
+}
+
+//-----------------------------------------------------------------------------
+// Set up the CMOS switches that mux the ADC: four switches, independently
+// closable, but should only close one at a time. Not an FPGA thing, but
+// the samples from the ADC always flow through the FPGA.
+//-----------------------------------------------------------------------------
+void SetAdcMuxFor(uint32_t whichGpio)
+{
+	AT91C_BASE_PIOA->PIO_OER =
+		GPIO_MUXSEL_HIPKD |
+		GPIO_MUXSEL_LOPKD |
+		GPIO_MUXSEL_LORAW |
+		GPIO_MUXSEL_HIRAW;
+
+	AT91C_BASE_PIOA->PIO_PER =
+		GPIO_MUXSEL_HIPKD |
+		GPIO_MUXSEL_LOPKD |
+		GPIO_MUXSEL_LORAW |
+		GPIO_MUXSEL_HIRAW;
+
+	LOW(GPIO_MUXSEL_HIPKD);
+	LOW(GPIO_MUXSEL_HIRAW);
+	LOW(GPIO_MUXSEL_LORAW);
+	LOW(GPIO_MUXSEL_LOPKD);
+
+	HIGH(whichGpio);
+}