diff --git a/src/drivers/elphel/Kconfig b/src/drivers/elphel/Kconfig
index 889bc37283fb01544374c6ee19a78c4c0e5c38e8..da48a01fce713c0415a6d292b1cdf71c1fa84982 100644
--- a/src/drivers/elphel/Kconfig
+++ b/src/drivers/elphel/Kconfig
@@ -20,4 +20,10 @@ config ELPHEL393_INIT
 		default y
 		help
 			If unsure, say Y.
+
+config ELPHEL393_EXTERNAL
+		tristate "Compile circbuf as external module"
+		default m
+		help
+			If unsure, say Y.
 endmenu  
diff --git a/src/drivers/elphel/Makefile b/src/drivers/elphel/Makefile
index f71a25f87804f19b8361d4d76eacf1d422964931..22df3421e17f2396b72415bb36a69eed3f7059eb 100644
--- a/src/drivers/elphel/Makefile
+++ b/src/drivers/elphel/Makefile
@@ -7,7 +7,12 @@ obj-$(CONFIG_ELPHEL393)           += elphel393-mem.o
 obj-$(CONFIG_ELPHELDRVONMICROZED) += elphel393-mem.o
 obj-$(CONFIG_ELPHEL393_INIT)      += elphel393-init.o   
 
-obj-$(CONFIG_ELPHEL393)           += framepars.o
-obj-$(CONFIG_ELPHEL393)           += sensor_common.o
-obj-$(CONFIG_ELPHEL393)           += quantization_tables.o
-obj-$(CONFIG_ELPHEL393)           += circbuf.o jpeghead.o
\ No newline at end of file
+#obj-$(CONFIG_ELPHEL393)           += framepars.o
+#obj-$(CONFIG_ELPHEL393)           += sensor_common.o
+#obj-$(CONFIG_ELPHEL393)           += quantization_tables.o
+#obj-$(CONFIG_ELPHEL393)           += circbuf.o jpeghead.o
+
+obj-$(CONFIG_ELPHEL393_EXTERNAL)  += framepars.o
+obj-$(CONFIG_ELPHEL393_EXTERNAL)  += sensor_common.o
+obj-$(CONFIG_ELPHEL393_EXTERNAL)  += quantization_tables.o
+obj-$(CONFIG_ELPHEL393_EXTERNAL)  += circbuf.o jpeghead.o
\ No newline at end of file
diff --git a/src/drivers/elphel/circbuf.c b/src/drivers/elphel/circbuf.c
index 1a6f48eeea3799b9eb67176b57366d528ff4c0d9..e625a2273fa7303f2b1ef13685bf6bc3f465fb63 100644
--- a/src/drivers/elphel/circbuf.c
+++ b/src/drivers/elphel/circbuf.c
@@ -150,6 +150,8 @@
 #include <linux/init.h>
 #include <linux/time.h>
 #include <linux/wait.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
 
 //#include <asm/system.h>
 //#include <asm/arch/memmap.h>
@@ -206,14 +208,23 @@
 
 /* really huge static DMA buffer (1288+8)*1032/3=445824 long-s */
 // DMA_SIZE - in 32-bit words, not bytes
-static unsigned long ccam_dma_buf[CCAM_DMA_SIZE + (PAGE_SIZE>>2)] __attribute__ ((aligned (PAGE_SIZE)));
+//static unsigned long ccam_dma_buf[CCAM_DMA_SIZE + (PAGE_SIZE>>2)] __attribute__ ((aligned (PAGE_SIZE)));
+static unsigned long *ccam_dma_buf = NULL;
 //!Without "static" system hangs after "Uncompressing Linux...
 unsigned long  * ccam_dma_buf_ptr = NULL;
 unsigned long * ccam_dma =         NULL; //! still used in autoexposure or something - why is in needed there?
 
-void init_ccam_dma_buf_ptr(void) {
-    ccam_dma_buf_ptr = ccam_dma_buf;
-    ccam_dma =         ccam_dma_buf; //&ccam_dma_buf[0]; Use in autoexposure
+int init_ccam_dma_buf_ptr(void) {
+	dma_addr_t *dma_handle;
+    //ccam_dma_buf_ptr = ccam_dma_buf;
+    //ccam_dma =         ccam_dma_buf; //&ccam_dma_buf[0]; Use in autoexposure
+
+    ccam_dma_buf_ptr = dma_alloc_coherent(NULL, (CCAM_DMA_SIZE + (PAGE_SIZE >> 2)), dma_handle, GFP_KERNEL);
+    if (!ccam_dma_buf_ptr) {
+    	return -ENOMEM;
+    } else {
+    	printk(KERN_DEBUG "%s: dma memory allocated at 0x%08x", __func__, dma_handle);
+    }
 }
 extern struct interframe_params_t frame_params; // cc353.c
 /*!======================================================================================
@@ -679,6 +690,12 @@ static int __init circbuf_all_init(void) {
      return res;
    }
 
+   res = init_ccam_dma_buf_ptr();
+   if (res < 0) {
+	   printk(KERN_ERR "%s: ERROR allocating coherent DMA buffer\n", __func__);
+	   return -ENOMEM;
+   }
+
    MDF19(printk("init_waitqueue_head()\n"));
    init_waitqueue_head(&circbuf_wait_queue);
    MDF19(printk("jpeg_htable_init()\n"));
@@ -689,7 +706,7 @@ static int __init circbuf_all_init(void) {
 
 
 module_init(circbuf_all_init);
-MODULE_LICENSE("GPLv3.0");
+MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Andrey Filippov <andrey@elphel.com>.");
 MODULE_DESCRIPTION(CIRCBUF_DRIVER_NAME);
 
diff --git a/src/drivers/elphel/circbuf.h b/src/drivers/elphel/circbuf.h
index 09ec0d72d198818dca2d0a855a05407c66609b3e..e68ec9e651dc8bdf8db33127bf0121f88457a020 100644
--- a/src/drivers/elphel/circbuf.h
+++ b/src/drivers/elphel/circbuf.h
@@ -25,10 +25,12 @@ ssize_t      circbuf_read  (struct file * file, char * buf, size_t count, loff_t
 int          circbuf_mmap  (struct file *file, struct vm_area_struct *vma);
 unsigned int circbuf_poll  (struct file *file,    poll_table *wait);
 
-void init_ccam_dma_buf_ptr(void);
+int init_ccam_dma_buf_ptr(void);
 /*!======================================================================================
  *! Wait queue for the processes waiting for a new frame to appear in the circular buffer
  *!======================================================================================*/
 extern wait_queue_head_t circbuf_wait_queue;
 
+unsigned long  *ccam_dma_buf_ptr;
+
 #endif /* _CIRCBUF_H */
diff --git a/src/drivers/elphel/framepars.c b/src/drivers/elphel/framepars.c
index 1ea9ce724bb08a5d2d411928e359caceb417c3c5..61077f20cdc75f684b6d6d4dbcdd621d96ef0bff 100644
--- a/src/drivers/elphel/framepars.c
+++ b/src/drivers/elphel/framepars.c
@@ -302,6 +302,7 @@ unsigned long           *multiSensIndex= NULL; /// index for per-sensor alternat
 unsigned long           *multiSensRvrsIndex=NULL; /// reverse index (to parent) for the multiSensIndex
 wait_queue_head_t framepars_wait_queue; /// used to wait for the frame to be acquired
 
+extern struct sensorproc_t * sensorproc;
 
 /**
  * @brief file private data
@@ -433,6 +434,7 @@ int initMultiPars(void) {
 inline unsigned long get_imageParamsThis    (int n) {
    return framepars[thisFrameNumber & PARS_FRAMES_MASK].pars[n] ;
 }
+EXPORT_SYMBOL_GPL(get_imageParamsThis);
 
 /**
  * @brief reads parameters from the previous frame (matching hardware index) - used to determine if historam was needed
@@ -462,6 +464,7 @@ inline void set_imageParamsThis    (int n,unsigned long d) {
 inline unsigned long get_globalParam  (int n) {
    return GLOBALPARS(n) ;
 }
+EXPORT_SYMBOL_GPL(get_globalParam);
 /**
  * @brief sets global (not related to particular frames) parameters
  * @param n number of a parameter to set  (numbers start from FRAMEPAR_GLOBALS)
@@ -471,6 +474,7 @@ inline unsigned long get_globalParam  (int n) {
 inline void          set_globalParam   (int n, unsigned long d) {
   GLOBALPARS(n)=d;
 }
+EXPORT_SYMBOL_GPL(set_globalParam);
 
 /**
  * @brief set same parameters in all frames
@@ -1340,6 +1344,6 @@ static int __init framepars_init(void) {
 
 
 module_init(framepars_init);
-MODULE_LICENSE("GPLv3.0");
+MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Andrey Filippov <andrey@elphel.com>.");
 MODULE_DESCRIPTION(X3X3_FRAMEPARS_DRIVER_NAME);
diff --git a/src/drivers/elphel/framepars.h b/src/drivers/elphel/framepars.h
index e91d7a8b1605da35c56981fb187ba8631563a8c0..506ab2b7afe3d18b1e18489f9ec974bd158117eb 100644
--- a/src/drivers/elphel/framepars.h
+++ b/src/drivers/elphel/framepars.h
@@ -4,7 +4,7 @@
 //extern struct framepars_t (*framepars)[PARS_FRAMES];
 extern struct framepars_t      *framepars;
 extern struct framepars_past_t *pastpars;
-extern unsigned long           *globalPars;
+unsigned long           *globalPars;
 extern unsigned long           *multiSensIndex;
 extern unsigned long           *multiSensRvrsIndex;
 
diff --git a/src/drivers/elphel/jpeghead.c b/src/drivers/elphel/jpeghead.c
index 9d5840319b11e9c4077af72800a89e60cd3a4e4b..4fb32ffa3a5d3997a56644ce7eea11355f7a0eea 100644
--- a/src/drivers/elphel/jpeghead.c
+++ b/src/drivers/elphel/jpeghead.c
@@ -118,6 +118,8 @@
 
 #define JPEG_HEADER_MAX_SIZE    0x300
 static int huffman_fpga_programmed=0;
+extern unsigned long *ccam_dma_buf_ptr;
+
 /// All huffman tabels data to be read/written from the application
 static struct huff_tables_t {
   struct huffman_encoded_t   header_huffman_tables[4]; 
@@ -369,6 +371,7 @@ int jpeghead_open(struct inode *inode, struct file *filp) { // set filesize
    inode->i_size=JPEG_HEADER_MAXSIZE; /// not the actual size
   return 0;
 }
+EXPORT_SYMBOL_GPL(jpeghead_open);
 
 /*!=================================================================
  *! Overloading lseek with additional functionality (to avoid ioctls)
@@ -439,6 +442,7 @@ loff_t  jpeghead_lseek(struct file * file, loff_t offset, int orig){
   }
   return ( file->f_pos );
 }
+EXPORT_SYMBOL_GPL(jpeghead_lseek);
 
 ssize_t jpeghead_read(struct file * file, char * buf, size_t count, loff_t *off) {
   unsigned long p;
@@ -457,6 +461,7 @@ ssize_t jpeghead_read(struct file * file, char * buf, size_t count, loff_t *off)
     }
     return count;
 }
+EXPORT_SYMBOL_GPL(jpeghead_read);
 
 
 /**huffman_* file operations
@@ -477,6 +482,7 @@ int huffman_open(struct inode *inode, struct file *filp) { // set filesize
 
   return 0;
 }
+EXPORT_SYMBOL_GPL(huffman_open);
 
 /*!=================================================================
  *! Overloading lseek with additional functionality
@@ -537,6 +543,7 @@ loff_t  huffman_lseek(struct file * file, loff_t offset, int orig){
   if (file->f_pos > sizeof(huff_tables)) file->f_pos = sizeof(huff_tables);
   return ( file->f_pos );
 }
+EXPORT_SYMBOL_GPL(huffman_lseek);
 
 
 ssize_t huffman_read(struct file * file, char * buf, size_t count, loff_t *off) {
@@ -552,6 +559,7 @@ ssize_t huffman_read(struct file * file, char * buf, size_t count, loff_t *off)
   }
   return count;
 }
+EXPORT_SYMBOL_GPL(huffman_read);
 
 
 ssize_t huffman_write(struct file * file, const char * buf, size_t count, loff_t *off) {
@@ -567,6 +575,7 @@ ssize_t huffman_write(struct file * file, const char * buf, size_t count, loff_t
 
   return count;
 }
+EXPORT_SYMBOL_GPL(huffman_write);
 
 /**
  * @brief Initialize Huffman tables with default data
@@ -637,6 +646,7 @@ void jpeg_htable_init (void) {
    MDF17(printk("jpeg_htable_fpga_encode ()\n"));
   jpeg_htable_fpga_encode ();
 }
+EXPORT_SYMBOL_GPL(jpeg_htable_init);
 
 /**
  * @brief encode all 4 Huffman tables into FPGA format
diff --git a/src/drivers/elphel/jpeghead.h b/src/drivers/elphel/jpeghead.h
index 092eba7548191d5c083c63a2ec7019803215fe22..45e1ca17784301828be8d655d23efeafc9334443 100644
--- a/src/drivers/elphel/jpeghead.h
+++ b/src/drivers/elphel/jpeghead.h
@@ -19,7 +19,7 @@ ssize_t huffman_write  (struct file * file, const char * buf, size_t count, loff
 
 
 extern unsigned long  * ccam_dma_buf_ptr;
-void init_ccam_dma_buf_ptr(void);
+//void init_ccam_dma_buf_ptr(void);
 #define JPEG_HEADER_MAXSIZE    0x300
 struct jpeghead_pd {
     int                minor;/// should be the first, same as in circbuf_pd
diff --git a/src/drivers/elphel/quantization_tables.c b/src/drivers/elphel/quantization_tables.c
index f5c741f87cc26888270d387cd1939b86efea5a66..bb5dda1c851b173d3be5bd2f7ffbba341c95f9c7 100644
--- a/src/drivers/elphel/quantization_tables.c
+++ b/src/drivers/elphel/quantization_tables.c
@@ -191,14 +191,14 @@ static unsigned long coring_tables[];
 
 
 
-
 /**
- * @brief force (re-)initilaization of quantization tables cache and FPGA qunatization table (in FPGA) when next used.
+ * @brief force (re-)initialization of quantization tables cache and FPGA quantization table (in FPGA) when next used.
  */
 void reset_qtables(void) {
  qtable_cache_initialized=0;
  qtable_fpga_initialized=0;
 }
+EXPORT_SYMBOL_GPL(reset_qtables);
 
 
 /**
diff --git a/src/drivers/elphel/sensor_common.c b/src/drivers/elphel/sensor_common.c
index b9411f4e2448be7cb5bde547181a2dc90d79fd55..d369b20ff68c840dd24f8618b8aea29cc07172ee 100644
--- a/src/drivers/elphel/sensor_common.c
+++ b/src/drivers/elphel/sensor_common.c
@@ -271,6 +271,9 @@ void camSeqSetJPEG_rp(int p) {
                                        get_globalParam(G_CIRCBUFSIZE):0)+ get_globalParam(G_CIRCBUFRP))
                                        - get_globalParam(G_CIRCBUFWP));
                                }
+EXPORT_SYMBOL_GPL(camSeqGetJPEG_wp);
+EXPORT_SYMBOL_GPL(camSeqGetJPEG_rp);
+EXPORT_SYMBOL_GPL(camSeqSetJPEG_rp);
 
 /*!
    End of compressor-related code - TODO: move to a separate file?
@@ -671,6 +674,7 @@ void reset_compressor(void) {
   fpga_counter_prev=0;
   local_irq_restore(flags);
 }
+EXPORT_SYMBOL_GPL(reset_compressor);
 
 /**
  * @brief Camera interrupts on/off  (currently both in the FPGA and in the CPU)
@@ -693,6 +697,7 @@ void camera_interrupts (int on) {
   REG_WR(intr_vect, regi_irq, rw_mask, intr_mask); 
 #endif /* TEST_DISABLE_CODE */
 }
+EXPORT_SYMBOL_GPL(camera_interrupts);
 
 
 int image_acq_open(struct inode *inode, struct file *filp) ;
@@ -715,7 +720,7 @@ static int __init image_acq_init(void) {
    int res;
    sensorproc= &s_sensorproc;
    MDD1(printk("sensorproc=0x%x\n",(int) sensorproc));
-   init_ccam_dma_buf_ptr();  /// should it be done here? Why not in circbuf.c?
+   //init_ccam_dma_buf_ptr();  /// should it be done here? Why not in circbuf.c?
 ///   init_histograms(); - other initializations?
    res = register_chrdev(ELPHEL_MAJOR, elphel_cam_name, &image_acq_fops);
    if(res < 0) {
@@ -770,6 +775,6 @@ int image_acq_mmap (struct file *file, struct vm_area_struct *vma) {
 
 
 module_init(image_acq_init);
-MODULE_LICENSE("GPLv3.0");
+MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Andrey Filippov <andrey@elphel.com>.");
 MODULE_DESCRIPTION(X3X3_IMAGEACQ_DRIVER_NAME);
diff --git a/src/drivers/elphel/sensor_common.h b/src/drivers/elphel/sensor_common.h
index ea9c1c04ad03d714cc43b09747e0bdd5ccaf31aa..4d07097c6230b35114b63e282d8611180e4dab71 100644
--- a/src/drivers/elphel/sensor_common.h
+++ b/src/drivers/elphel/sensor_common.h
@@ -2,7 +2,7 @@
 #define _SENSOR_COMMON_H
 
 //extern struct sensor_t sensor; // current sensor (will be copied to by sensor driver), made external for the cc353.c to read/write i2c
-extern struct sensorproc_t * sensorproc;
+struct sensorproc_t * sensorproc;
 /// IRQ-safe "nice" FPGA table write and histogram read functions - they split the data in chunks of fixed size,
 /// disable IRQ, transfer a chunk, then reenable interrupt before proceedg to the next chunk
 #define FPGA_TABLE_CHUNK 64 // up to 64 words to send to the table/from histogram on a single IRQ-off transfer