diff --git a/src/Makefile b/src/Makefile
index f223057..60d140c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -15,10 +15,10 @@ LDFLAGS	= -lm -lrt -lpthread
 CCP = g++ 
 CC = gcc 
 
-v2rpitx: gpio.h gpio.cpp dma.h dma.cpp mailbox.c raspberry_pi_revision.c v2rpitx.cpp
+v2rpitx: gpio.h gpio.cpp dma.h dma.cpp mailbox.c raspberry_pi_revision.c v2rpitx.cpp fmdmasync.h fmdmasync.cpp 
 	$(CC) $(CFLAGS) -c -o mailbox.o mailbox.c
 	$(CC) $(CFLAGS) -c -o raspberry_pi_revision.o raspberry_pi_revision.c
-	$(CCP) $(CFLAGS) -o v2rpitx  dma.cpp gpio.cpp mailbox.o raspberry_pi_revision.o v2rpitx.cpp $(LDFLAGS) 
+	$(CCP) $(CFLAGS) -o v2rpitx  fmdmasync.cpp  dma.cpp gpio.cpp mailbox.o raspberry_pi_revision.o v2rpitx.cpp $(LDFLAGS) 
 
 
 		
diff --git a/src/dma.cpp b/src/dma.cpp
index a0cd30b..5195ab2 100644
--- a/src/dma.cpp
+++ b/src/dma.cpp
@@ -4,13 +4,14 @@
 extern "C"
 {
 #include "mailbox.h"
+#include "raspberry_pi_revision.h"
 }
 #include <unistd.h>
 
 
 #define BUS_TO_PHYS(x) ((x)&~0xC0000000)
 
-dma::dma(int Channel,int CBSize,int UserMemSize,unsigned int mem_flag)
+dma::dma(int Channel,uint32_t CBSize,uint32_t UserMemSize)
 {
 	channel=Channel;
     mbox.handle = mbox_open();
@@ -19,7 +20,10 @@ dma::dma(int Channel,int CBSize,int UserMemSize,unsigned int mem_flag)
 		fprintf(stderr,"Failed to open mailbox\n");
 		
 	}
-	
+	cbsize=CBSize;
+	usermemsize=UserMemSize;
+
+	GetRpiInfo(); // Fill mem_flag and dram_phys_base
     unsigned int MemoryRequired=CBSize*sizeof(dma_cb_t)+UserMemSize*sizeof(unsigned int);
     int NumPages=(MemoryRequired/PAGE_SIZE)+1;
     fprintf(stderr,"%d Size NUM PAGES %d PAGE_SIZE %d\n",MemoryRequired,NumPages,PAGE_SIZE);
@@ -35,6 +39,31 @@ dma::dma(int Channel,int CBSize,int UserMemSize,unsigned int mem_flag)
     usermem= (unsigned int *)(virtbase+UserMemSize*sizeof(unsigned int)); // user memory is placed after
 }
 
+void dma::GetRpiInfo()
+{
+	RASPBERRY_PI_INFO_T info;
+	if (getRaspberryPiInformation(&info) > 0)
+	{
+		if(info.peripheralBase==RPI_BROADCOM_2835_PERIPHERAL_BASE)
+		{
+			
+			 dram_phys_base   =  0x40000000;
+			 mem_flag         =  MEM_FLAG_L1_NONALLOCATING|MEM_FLAG_HINT_PERMALOCK|MEM_FLAG_NO_INIT;//0x0c;
+		}
+
+		if((info.peripheralBase==RPI_BROADCOM_2836_PERIPHERAL_BASE)||(info.peripheralBase==RPI_BROADCOM_2837_PERIPHERAL_BASE))
+		{
+			
+			 dram_phys_base   =  0xc0000000;
+			 mem_flag         =  MEM_FLAG_L1_NONALLOCATING/*MEM_FLAG_DIRECT*/|MEM_FLAG_HINT_PERMALOCK|MEM_FLAG_NO_INIT;//0x04;
+		}
+	}
+	else
+	{
+		fprintf(stderr,"Unknown Raspberry architecture\n");
+	}
+}
+
 dma::~dma()
 {
         unmapmem(mbox.virt_addr, NumPages * PAGE_SIZE);
diff --git a/src/dma.h b/src/dma.h
index 128c910..0ed24c2 100644
--- a/src/dma.h
+++ b/src/dma.h
@@ -3,6 +3,34 @@
 #include "stdint.h"
 #include "gpio.h"
 
+// ---- Memory allocating defines
+// https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
+#define MEM_FLAG_DISCARDABLE  (1 << 0) /* can be resized to 0 at any time. Use for cached data */
+#define MEM_FLAG_NORMAL  (0 << 2) /* normal allocating alias. Don't use from ARM */
+#define MEM_FLAG_DIRECT  (1 << 2) /* 0xC alias uncached */
+#define MEM_FLAG_COHERENT  (2 << 2) /* 0x8 alias. Non-allocating in L2 but coherent */
+#define MEM_FLAG_L1_NONALLOCATING  (MEM_FLAG_DIRECT | MEM_FLAG_COHERENT) /* Allocating in L2 */
+#define MEM_FLAG_ZERO  ( 1 << 4)  /* initialise buffer to all zeros */
+#define MEM_FLAG_NO_INIT  ( 1 << 5) /* don't initialise (default is initialise to all ones */
+#define MEM_FLAG_HINT_PERMALOCK  (1 << 6) /* Likely to be locked for long periods of time. */
+
+#define BCM2708_DMA_SRC_IGNOR           (1<<11)
+#define BCM2708_DMA_SRC_INC		(1<<8)
+#define BCM2708_DMA_DST_IGNOR           (1<<7)
+#define BCM2708_DMA_NO_WIDE_BURSTS	(1<<26)
+#define BCM2708_DMA_WAIT_RESP		(1<<3)
+
+
+#define BCM2708_DMA_D_DREQ		(1<<6)
+#define BCM2708_DMA_PER_MAP(x)		((x)<<16)
+#define BCM2708_DMA_END			(1<<1)
+#define BCM2708_DMA_RESET		(1<<31)
+#define BCM2708_DMA_INT			(1<<2)
+
+#define DMA_CS			(0x00/4)
+#define DMA_CONBLK_AD		(0x04/4)
+#define DMA_DEBUG		(0x20/4)
+
 class dma
 {
     protected:
@@ -29,17 +57,21 @@ class dma
     int NumPages=0;
 	int channel; //DMA Channel
 	dmagpio dma_reg;
+
+	uint32_t mem_flag; //Cache or not depending on Rpi1 or 2/3
+	uint32_t dram_phys_base;
     public:
     dma_cb_t *cbarray;
+	uint32_t cbsize;
     unsigned int *usermem;
+	uint32_t usermemsize;
 
 
-
-    dma(int Channel,int CBSize,int UserMemSize,unsigned int mem_flag);
+    dma(int Channel,uint32_t CBSize,uint32_t UserMemSize);
     ~dma();
     uint32_t mem_virt_to_phys(volatile void *virt);
     uint32_t mem_phys_to_virt(volatile uint32_t phys);
-
+	void GetRpiInfo();
     int start();
     int stop();
     
diff --git a/src/fmdmasync.cpp b/src/fmdmasync.cpp
new file mode 100644
index 0000000..fcb4891
--- /dev/null
+++ b/src/fmdmasync.cpp
@@ -0,0 +1,12 @@
+#include "stdio.h"
+#include "fmdmasync.h"
+
+fmdmasync::fmdmasync(int Channel,uint32_t FifoSize):dma(Channel,FifoSize*2,FifoSize)
+{
+	
+}
+
+fmdmasync::~fmdmasync()
+{
+}
+
diff --git a/src/fmdmasync.h b/src/fmdmasync.h
new file mode 100644
index 0000000..a56e082
--- /dev/null
+++ b/src/fmdmasync.h
@@ -0,0 +1,14 @@
+#ifndef DEF_FMDMASYNC
+#define DEF_FMDMASYNC
+
+#include "stdint.h"
+#include "dma.h"
+
+class fmdmasync:public dma
+{
+	public:
+	fmdmasync(int Channel,uint32_t FifoSize);
+	~fmdmasync();
+}; 
+
+#endif