diff --git a/board/hymod/bsp.c b/board/hymod/bsp.c
index 9a92941..2cd3707 100644
--- a/board/hymod/bsp.c
+++ b/board/hymod/bsp.c
@@ -75,14 +75,14 @@
  */
 
 int
-fpga_load (int mezz, uchar *addr, ulong size)
+fpga_load(int mezz, const uchar *addr, ulong size)
 {
 	hymod_conf_t *cp = &gd->bd->bi_hymod_conf;
 	xlx_info_t *fp;
 	xlx_iopins_t *fpgaio;
 	volatile uchar *fpgabase;
 	volatile uint cnt;
-	uchar *eaddr = addr + size;
+	const uchar *eaddr = addr + size;
 	int result;
 
 	if (mezz)
diff --git a/board/matrix_vision/mergerbox/fpga.c b/board/matrix_vision/mergerbox/fpga.c
index 673bc2c..021e9c4 100644
--- a/board/matrix_vision/mergerbox/fpga.c
+++ b/board/matrix_vision/mergerbox/fpga.c
@@ -161,7 +161,7 @@
 	return 0;
 }
 
-int fpga_wr_fn(void *buf, size_t len, int flush, int cookie)
+int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie)
 {
 	unsigned char *data = (unsigned char *) buf;
 	int i;
diff --git a/board/matrix_vision/mergerbox/fpga.h b/board/matrix_vision/mergerbox/fpga.h
index fccff9f..89f879a 100644
--- a/board/matrix_vision/mergerbox/fpga.h
+++ b/board/matrix_vision/mergerbox/fpga.h
@@ -26,5 +26,5 @@
 extern int fpga_config_fn(int assert, int flush, int cookie);
 extern int fpga_done_fn(int cookie);
 extern int fpga_clk_fn(int assert_clk, int flush, int cookie);
-extern int fpga_wr_fn(void *buf, size_t len, int flush, int cookie);
+extern int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie);
 extern int fpga_null_fn(int cookie);
diff --git a/board/matrix_vision/mvbc_p/fpga.c b/board/matrix_vision/mvbc_p/fpga.c
index 3ed46fe..6ce96ba 100644
--- a/board/matrix_vision/mvbc_p/fpga.c
+++ b/board/matrix_vision/mvbc_p/fpga.c
@@ -160,7 +160,7 @@
 	return 0;
 }
 
-int fpga_wr_fn(void *buf, size_t len, int flush, int cookie)
+int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie)
 {
 	unsigned char *data = (unsigned char *) buf;
 	int i;
diff --git a/board/matrix_vision/mvbc_p/fpga.h b/board/matrix_vision/mvbc_p/fpga.h
index 3723073..8f74a00 100644
--- a/board/matrix_vision/mvbc_p/fpga.h
+++ b/board/matrix_vision/mvbc_p/fpga.h
@@ -30,5 +30,5 @@
 extern int fpga_config_fn(int assert, int flush, int cookie);
 extern int fpga_done_fn(int cookie);
 extern int fpga_clk_fn(int assert_clk, int flush, int cookie);
-extern int fpga_wr_fn(void *buf, size_t len, int flush, int cookie);
+extern int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie);
 extern int fpga_null_fn(int cookie);
diff --git a/board/matrix_vision/mvblm7/fpga.c b/board/matrix_vision/mvblm7/fpga.c
index 7b03d6f..dc5a738 100644
--- a/board/matrix_vision/mvblm7/fpga.c
+++ b/board/matrix_vision/mvblm7/fpga.c
@@ -172,7 +172,7 @@
 	return 0;
 }
 
-int fpga_wr_fn(void *buf, size_t len, int flush, int cookie)
+int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie)
 {
 	unsigned char *data = (unsigned char *) buf;
 	int i;
diff --git a/board/matrix_vision/mvblm7/fpga.h b/board/matrix_vision/mvblm7/fpga.h
index 19277eb..f422f20 100644
--- a/board/matrix_vision/mvblm7/fpga.h
+++ b/board/matrix_vision/mvblm7/fpga.h
@@ -30,5 +30,5 @@
 extern int fpga_config_fn(int assert, int flush, int cookie);
 extern int fpga_done_fn(int cookie);
 extern int fpga_clk_fn(int assert_clk, int flush, int cookie);
-extern int fpga_wr_fn(void *buf, size_t len, int flush, int cookie);
+extern int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie);
 extern int fpga_null_fn(int cookie);
diff --git a/common/cmd_fpga.c b/common/cmd_fpga.c
index 0ad310f..8946345 100644
--- a/common/cmd_fpga.c
+++ b/common/cmd_fpga.c
@@ -289,7 +289,7 @@
 			{
 				const void *fit_hdr = (const void *)fpga_data;
 				int noffset;
-				void *fit_data;
+				const void *fit_data;
 
 				if (fit_uname == NULL) {
 					puts ("No FIT subimage unit name\n");
diff --git a/drivers/fpga/ACEX1K.c b/drivers/fpga/ACEX1K.c
index 06b4247..4703fc1 100644
--- a/drivers/fpga/ACEX1K.c
+++ b/drivers/fpga/ACEX1K.c
@@ -48,13 +48,13 @@
 #define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/10		/* 100 ms */
 #endif
 
-static int ACEX1K_ps_load( Altera_desc *desc, void *buf, size_t bsize );
-static int ACEX1K_ps_dump( Altera_desc *desc, void *buf, size_t bsize );
-/* static int ACEX1K_ps_info( Altera_desc *desc ); */
+static int ACEX1K_ps_load(Altera_desc *desc, const void *buf, size_t bsize);
+static int ACEX1K_ps_dump(Altera_desc *desc, const void *buf, size_t bsize);
+/* static int ACEX1K_ps_info(Altera_desc *desc); */
 
 /* ------------------------------------------------------------------------- */
 /* ACEX1K Generic Implementation */
-int ACEX1K_load (Altera_desc * desc, void *buf, size_t bsize)
+int ACEX1K_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -74,7 +74,7 @@
 	return ret_val;
 }
 
-int ACEX1K_dump (Altera_desc * desc, void *buf, size_t bsize)
+int ACEX1K_dump(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -103,7 +103,7 @@
 /* ------------------------------------------------------------------------- */
 /* ACEX1K Passive Serial Generic Implementation                                  */
 
-static int ACEX1K_ps_load (Altera_desc * desc, void *buf, size_t bsize)
+static int ACEX1K_ps_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Altera_ACEX1K_Passive_Serial_fns *fn = desc->iface_fns;
@@ -256,7 +256,7 @@
 	return ret_val;
 }
 
-static int ACEX1K_ps_dump (Altera_desc * desc, void *buf, size_t bsize)
+static int ACEX1K_ps_dump(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	/* Readback is only available through the Slave Parallel and         */
 	/* boundary-scan interfaces.                                         */
diff --git a/drivers/fpga/altera.c b/drivers/fpga/altera.c
index 103d81c..f087d01 100644
--- a/drivers/fpga/altera.c
+++ b/drivers/fpga/altera.c
@@ -45,7 +45,7 @@
 static int altera_validate (Altera_desc * desc, const char *fn);
 
 /* ------------------------------------------------------------------------- */
-int altera_load( Altera_desc *desc, void *buf, size_t bsize )
+int altera_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume a failure */
 
@@ -85,7 +85,7 @@
 	return ret_val;
 }
 
-int altera_dump( Altera_desc *desc, void *buf, size_t bsize )
+int altera_dump(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume a failure */
 
diff --git a/drivers/fpga/cyclon2.c b/drivers/fpga/cyclon2.c
index 567099e..26494a3 100644
--- a/drivers/fpga/cyclon2.c
+++ b/drivers/fpga/cyclon2.c
@@ -47,13 +47,13 @@
 #define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/10		/* 100 ms */
 #endif
 
-static int CYC2_ps_load( Altera_desc *desc, void *buf, size_t bsize );
-static int CYC2_ps_dump( Altera_desc *desc, void *buf, size_t bsize );
+static int CYC2_ps_load(Altera_desc *desc, const void *buf, size_t bsize);
+static int CYC2_ps_dump(Altera_desc *desc, const void *buf, size_t bsize);
 /* static int CYC2_ps_info( Altera_desc *desc ); */
 
 /* ------------------------------------------------------------------------- */
 /* CYCLON2 Generic Implementation */
-int CYC2_load (Altera_desc * desc, void *buf, size_t bsize)
+int CYC2_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -83,7 +83,7 @@
 	return ret_val;
 }
 
-int CYC2_dump (Altera_desc * desc, void *buf, size_t bsize)
+int CYC2_dump(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -110,7 +110,7 @@
 
 /* ------------------------------------------------------------------------- */
 /* CYCLON2 Passive Serial Generic Implementation                                  */
-static int CYC2_ps_load (Altera_desc * desc, void *buf, size_t bsize)
+static int CYC2_ps_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Altera_CYC2_Passive_Serial_fns *fn = desc->iface_fns;
@@ -210,7 +210,7 @@
 	return ret_val;
 }
 
-static int CYC2_ps_dump (Altera_desc * desc, void *buf, size_t bsize)
+static int CYC2_ps_dump(Altera_desc *desc, const void *buf, size_t bsize)
 {
 	/* Readback is only available through the Slave Parallel and         */
 	/* boundary-scan interfaces.                                         */
diff --git a/drivers/fpga/fpga.c b/drivers/fpga/fpga.c
index a669039..26d2443 100644
--- a/drivers/fpga/fpga.c
+++ b/drivers/fpga/fpga.c
@@ -52,7 +52,7 @@
 
 /* Local static functions */
 static __attribute__((__const__)) fpga_desc * __attribute__((__const__)) fpga_get_desc( int devnum );
-static __attribute__((__const__)) fpga_desc * __attribute__((__const__)) fpga_validate( int devnum, void *buf,
+static __attribute__((__const__)) fpga_desc * __attribute__((__const__)) fpga_validate(int devnum, const void *buf,
 					 size_t bsize, char *fn );
 static int fpga_dev_info( int devnum );
 
@@ -94,7 +94,7 @@
 /* fpga_validate
  *	generic parameter checking code
  */
-static __attribute__((__const__)) fpga_desc * __attribute__((__const__)) fpga_validate( int devnum, void *buf,
+static __attribute__((__const__)) fpga_desc * __attribute__((__const__)) fpga_validate(int devnum, const void *buf,
 					 size_t bsize, char *fn )
 {
 	fpga_desc * desc = fpga_get_desc( devnum );
@@ -212,7 +212,7 @@
 /*
  *	Generic multiplexing code
  */
-int fpga_load( int devnum, void *buf, size_t bsize )
+int fpga_load(int devnum, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;           /* assume failure */
 	fpga_desc * desc = fpga_validate( devnum, buf, bsize, (char *)__FUNCTION__ );
@@ -252,7 +252,7 @@
 /* fpga_dump
  *	generic multiplexing code
  */
-int fpga_dump( int devnum, void *buf, size_t bsize )
+int fpga_dump(int devnum, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;           /* assume failure */
 	fpga_desc * desc = fpga_validate( devnum, buf, bsize, (char *)__FUNCTION__ );
diff --git a/drivers/fpga/spartan2.c b/drivers/fpga/spartan2.c
index cd16a9c..4bc7070 100644
--- a/drivers/fpga/spartan2.c
+++ b/drivers/fpga/spartan2.c
@@ -48,17 +48,17 @@
 #define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/100	/* 10 ms */
 #endif
 
-static int Spartan2_sp_load( Xilinx_desc *desc, void *buf, size_t bsize );
-static int Spartan2_sp_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-/* static int Spartan2_sp_info( Xilinx_desc *desc ); */
+static int Spartan2_sp_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Spartan2_sp_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+/* static int Spartan2_sp_info(Xilinx_desc *desc ); */
 
-static int Spartan2_ss_load( Xilinx_desc *desc, void *buf, size_t bsize );
-static int Spartan2_ss_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-/* static int Spartan2_ss_info( Xilinx_desc *desc ); */
+static int Spartan2_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Spartan2_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+/* static int Spartan2_ss_info(Xilinx_desc *desc ); */
 
 /* ------------------------------------------------------------------------- */
 /* Spartan-II Generic Implementation */
-int Spartan2_load (Xilinx_desc * desc, void *buf, size_t bsize)
+int Spartan2_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -81,7 +81,7 @@
 	return ret_val;
 }
 
-int Spartan2_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+int Spartan2_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -113,7 +113,7 @@
 /* ------------------------------------------------------------------------- */
 /* Spartan-II Slave Parallel Generic Implementation */
 
-static int Spartan2_sp_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan2_sp_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan2_Slave_Parallel_fns *fn = desc->iface_fns;
@@ -265,7 +265,7 @@
 	return ret_val;
 }
 
-static int Spartan2_sp_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan2_sp_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan2_Slave_Parallel_fns *fn = desc->iface_fns;
@@ -313,7 +313,7 @@
 
 /* ------------------------------------------------------------------------- */
 
-static int Spartan2_ss_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan2_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan2_Slave_Serial_fns *fn = desc->iface_fns;
@@ -456,7 +456,7 @@
 	return ret_val;
 }
 
-static int Spartan2_ss_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan2_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	/* Readback is only available through the Slave Parallel and         */
 	/* boundary-scan interfaces.                                         */
diff --git a/drivers/fpga/spartan3.c b/drivers/fpga/spartan3.c
index 1dd6f26..9207391 100644
--- a/drivers/fpga/spartan3.c
+++ b/drivers/fpga/spartan3.c
@@ -53,17 +53,17 @@
 #define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/100	/* 10 ms */
 #endif
 
-static int Spartan3_sp_load( Xilinx_desc *desc, void *buf, size_t bsize );
-static int Spartan3_sp_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-/* static int Spartan3_sp_info( Xilinx_desc *desc ); */
+static int Spartan3_sp_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Spartan3_sp_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+/* static int Spartan3_sp_info(Xilinx_desc *desc ); */
 
-static int Spartan3_ss_load( Xilinx_desc *desc, void *buf, size_t bsize );
-static int Spartan3_ss_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-/* static int Spartan3_ss_info( Xilinx_desc *desc ); */
+static int Spartan3_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Spartan3_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+/* static int Spartan3_ss_info(Xilinx_desc *desc); */
 
 /* ------------------------------------------------------------------------- */
 /* Spartan-II Generic Implementation */
-int Spartan3_load (Xilinx_desc * desc, void *buf, size_t bsize)
+int Spartan3_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -86,7 +86,7 @@
 	return ret_val;
 }
 
-int Spartan3_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+int Spartan3_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -118,7 +118,7 @@
 /* ------------------------------------------------------------------------- */
 /* Spartan-II Slave Parallel Generic Implementation */
 
-static int Spartan3_sp_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan3_sp_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan3_Slave_Parallel_fns *fn = desc->iface_fns;
@@ -272,7 +272,7 @@
 	return ret_val;
 }
 
-static int Spartan3_sp_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan3_sp_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan3_Slave_Parallel_fns *fn = desc->iface_fns;
@@ -320,7 +320,7 @@
 
 /* ------------------------------------------------------------------------- */
 
-static int Spartan3_ss_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan3_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	Xilinx_Spartan3_Slave_Serial_fns *fn = desc->iface_fns;
@@ -475,7 +475,7 @@
 	return ret_val;
 }
 
-static int Spartan3_ss_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Spartan3_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	/* Readback is only available through the Slave Parallel and         */
 	/* boundary-scan interfaces.                                         */
diff --git a/drivers/fpga/virtex2.c b/drivers/fpga/virtex2.c
index d1b4d15..b26d231 100644
--- a/drivers/fpga/virtex2.c
+++ b/drivers/fpga/virtex2.c
@@ -101,13 +101,13 @@
 #define CONFIG_SYS_FPGA_WAIT_CONFIG	CONFIG_SYS_HZ/5	/* 200 ms */
 #endif
 
-static int Virtex2_ssm_load (Xilinx_desc * desc, void *buf, size_t bsize);
-static int Virtex2_ssm_dump (Xilinx_desc * desc, void *buf, size_t bsize);
+static int Virtex2_ssm_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Virtex2_ssm_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
 
-static int Virtex2_ss_load (Xilinx_desc * desc, void *buf, size_t bsize);
-static int Virtex2_ss_dump (Xilinx_desc * desc, void *buf, size_t bsize);
+static int Virtex2_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize);
+static int Virtex2_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
 
-int Virtex2_load (Xilinx_desc * desc, void *buf, size_t bsize)
+int Virtex2_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -129,7 +129,7 @@
 	return ret_val;
 }
 
-int Virtex2_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+int Virtex2_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 
@@ -170,7 +170,7 @@
  *    INIT_B and DONE lines.  If both are high, configuration has
  *    succeeded. Congratulations!
  */
-static int Virtex2_ssm_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Virtex2_ssm_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 	Xilinx_Virtex2_Slave_SelectMap_fns *fn = desc->iface_fns;
@@ -369,7 +369,7 @@
 /*
  * Read the FPGA configuration data
  */
-static int Virtex2_ssm_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Virtex2_ssm_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;
 	Xilinx_Virtex2_Slave_SelectMap_fns *fn = desc->iface_fns;
@@ -421,13 +421,13 @@
 	return ret_val;
 }
 
-static int Virtex2_ss_load (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Virtex2_ss_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	printf ("%s: Slave Serial Loading is unsupported\n", __FUNCTION__);
 	return FPGA_FAIL;
 }
 
-static int Virtex2_ss_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+static int Virtex2_ss_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	printf ("%s: Slave Serial Dumping is unsupported\n", __FUNCTION__);
 	return FPGA_FAIL;
diff --git a/drivers/fpga/xilinx.c b/drivers/fpga/xilinx.c
index 08dfdec..4072cb4 100644
--- a/drivers/fpga/xilinx.c
+++ b/drivers/fpga/xilinx.c
@@ -48,7 +48,7 @@
 
 /* ------------------------------------------------------------------------- */
 
-int xilinx_load (Xilinx_desc * desc, void *buf, size_t bsize)
+int xilinx_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume a failure */
 
@@ -95,7 +95,7 @@
 	return ret_val;
 }
 
-int xilinx_dump (Xilinx_desc * desc, void *buf, size_t bsize)
+int xilinx_dump(Xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume a failure */
 
diff --git a/include/ACEX1K.h b/include/ACEX1K.h
index 2bb9226..e2e96d2 100644
--- a/include/ACEX1K.h
+++ b/include/ACEX1K.h
@@ -30,13 +30,13 @@
 
 #include <altera.h>
 
-extern int ACEX1K_load( Altera_desc *desc, void *image, size_t size );
-extern int ACEX1K_dump( Altera_desc *desc, void *buf, size_t bsize );
-extern int ACEX1K_info( Altera_desc *desc );
+extern int ACEX1K_load(Altera_desc *desc, const void *image, size_t size);
+extern int ACEX1K_dump(Altera_desc *desc, const void *buf, size_t bsize);
+extern int ACEX1K_info(Altera_desc *desc);
 
-extern int CYC2_load( Altera_desc *desc, void *image, size_t size );
-extern int CYC2_dump( Altera_desc *desc, void *buf, size_t bsize );
-extern int CYC2_info( Altera_desc *desc );
+extern int CYC2_load(Altera_desc *desc, const void *image, size_t size);
+extern int CYC2_dump(Altera_desc *desc, const void *buf, size_t bsize);
+extern int CYC2_info(Altera_desc *desc);
 
 /* Slave Serial Implementation function table */
 typedef struct {
diff --git a/include/altera.h b/include/altera.h
index f28a6a8..7a2bece 100644
--- a/include/altera.h
+++ b/include/altera.h
@@ -76,9 +76,9 @@
 
 /* Generic Altera Functions
  *********************************************************************/
-extern int altera_load( Altera_desc *desc, void *image, size_t size );
-extern int altera_dump( Altera_desc *desc, void *buf, size_t bsize );
-extern int altera_info( Altera_desc *desc );
+extern int altera_load(Altera_desc *desc, const void *image, size_t size);
+extern int altera_dump(Altera_desc *desc, const void *buf, size_t bsize);
+extern int altera_info(Altera_desc *desc);
 
 /* Board specific implementation specific function types
  *********************************************************************/
@@ -88,7 +88,7 @@
 typedef int (*Altera_done_fn)( int cookie );
 typedef int (*Altera_clk_fn)( int assert_clk, int flush, int cookie );
 typedef int (*Altera_data_fn)( int assert_data, int flush, int cookie );
-typedef int (*Altera_write_fn)(void *buf, size_t len, int flush, int cookie);
+typedef int(*Altera_write_fn)(const void *buf, size_t len, int flush, int cookie);
 typedef int (*Altera_abort_fn)( int cookie );
 typedef int (*Altera_post_fn)( int cookie );
 
diff --git a/include/fpga.h b/include/fpga.h
index ac24f2b..e0b1fe7 100644
--- a/include/fpga.h
+++ b/include/fpga.h
@@ -72,11 +72,11 @@
 
 
 /* root function definitions */
-extern void fpga_init( void );
-extern int fpga_add( fpga_type devtype, void *desc );
-extern int fpga_count( void );
-extern int fpga_load( int devnum, void *buf, size_t bsize );
-extern int fpga_dump( int devnum, void *buf, size_t bsize );
-extern int fpga_info( int devnum );
+extern void fpga_init(void);
+extern int fpga_add(fpga_type devtype, void *desc);
+extern int fpga_count(void);
+extern int fpga_load(int devnum, const void *buf, size_t bsize);
+extern int fpga_dump(int devnum, const void *buf, size_t bsize);
+extern int fpga_info(int devnum);
 
 #endif	/* _FPGA_H_ */
diff --git a/include/spartan2.h b/include/spartan2.h
index 8959f90..e257a67 100644
--- a/include/spartan2.h
+++ b/include/spartan2.h
@@ -27,9 +27,9 @@
 
 #include <xilinx.h>
 
-extern int Spartan2_load( Xilinx_desc *desc, void *image, size_t size );
-extern int Spartan2_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-extern int Spartan2_info( Xilinx_desc *desc );
+extern int Spartan2_load(Xilinx_desc *desc, const void *image, size_t size);
+extern int Spartan2_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+extern int Spartan2_info(Xilinx_desc *desc);
 
 /* Slave Parallel Implementation function table */
 typedef struct {
diff --git a/include/spartan3.h b/include/spartan3.h
index 0f0b400..67ede4b 100644
--- a/include/spartan3.h
+++ b/include/spartan3.h
@@ -27,9 +27,9 @@
 
 #include <xilinx.h>
 
-extern int Spartan3_load( Xilinx_desc *desc, void *image, size_t size );
-extern int Spartan3_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-extern int Spartan3_info( Xilinx_desc *desc );
+extern int Spartan3_load(Xilinx_desc *desc, const void *image, size_t size);
+extern int Spartan3_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+extern int Spartan3_info(Xilinx_desc *desc);
 
 /* Slave Parallel Implementation function table */
 typedef struct {
diff --git a/include/virtex2.h b/include/virtex2.h
index 89d7d76..4717e0c 100644
--- a/include/virtex2.h
+++ b/include/virtex2.h
@@ -28,9 +28,9 @@
 
 #include <xilinx.h>
 
-extern int Virtex2_load( Xilinx_desc *desc, void *image, size_t size );
-extern int Virtex2_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-extern int Virtex2_info( Xilinx_desc *desc );
+extern int Virtex2_load(Xilinx_desc *desc, const void *image, size_t size);
+extern int Virtex2_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+extern int Virtex2_info(Xilinx_desc *desc);
 
 /*
  * Slave SelectMap Implementation function table.
diff --git a/include/xilinx.h b/include/xilinx.h
index 2cb2e5b..5f25b7a 100644
--- a/include/xilinx.h
+++ b/include/xilinx.h
@@ -81,9 +81,9 @@
 
 /* Generic Xilinx Functions
  *********************************************************************/
-extern int xilinx_load( Xilinx_desc *desc, void *image, size_t size );
-extern int xilinx_dump( Xilinx_desc *desc, void *buf, size_t bsize );
-extern int xilinx_info( Xilinx_desc *desc );
+extern int xilinx_load(Xilinx_desc *desc, const void *image, size_t size);
+extern int xilinx_dump(Xilinx_desc *desc, const void *buf, size_t bsize);
+extern int xilinx_info(Xilinx_desc *desc);
 
 /* Board specific implementation specific function types
  *********************************************************************/