- moved flash erase_check target code to target.c

git-svn-id: svn://svn.berlios.de/openocd/trunk@694 b42882b7-edfa-0310-969c-e2dbd0fdcd60

19 files changed, 210 insertions, 210 deletions

diff --git a/src/flash/flash.c b/src/flash/flash.c
index 1e4edd62..91a94db7 100644
--- a/src/flash/flash.c
+++ b/src/flash/flash.c
@@ -1090,11 +1090,11 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
 	return retval;
 }
 
-int default_flash_blank_check(struct flash_bank_s *bank)
+int default_flash_mem_blank_check(struct flash_bank_s *bank)
 {
 	target_t *target = bank->target;
 	u8 buffer[1024];
-	int buffer_size=sizeof(buffer);
+	int buffer_size = sizeof(buffer);
 	int i;
 	int nBytes;
 	
@@ -1103,227 +1103,73 @@ int default_flash_blank_check(struct flash_bank_s *bank)
 		return ERROR_TARGET_NOT_HALTED;
 	}
 	
-	int retval;
-	int fast_check=0;
-	working_area_t *erase_check_algorithm;
-#if 0
-	/* FIX! doesn't work yet... */
-	/*
-	char test(char *a, int len, char t)
+	for (i = 0; i < bank->num_sectors; i++)
 	{
-	  int i=0;
-	
-	  for (i=0; i<len; i++)
+		int j;
+		bank->sectors[i].is_erased = 1;
+		
+		for (j = 0; j < bank->sectors[i].size; j += buffer_size)
 		{
-		  t&=a[i];
-	
+			int chunk;
+			int retval;
+			chunk = buffer_size;
+			if (chunk > (j - bank->sectors[i].size))
+			{
+				chunk = (j - bank->sectors[i].size);
+			}
+			
+			retval = target->type->read_memory(target, bank->base + bank->sectors[i].offset + j, 4, chunk/4, buffer);
+			if (retval != ERROR_OK)
+				return retval;
+		
+			for (nBytes = 0; nBytes < chunk; nBytes++)
+			{
+				if (buffer[nBytes] != 0xFF)
+				{
+					bank->sectors[i].is_erased = 0;
+					break;
+				}
+			}
 		}
 	}
 	
-	$ arm-elf-gcc -c -mthumb -O3 test.c
-	
-	$ arm-elf-objdump --disassemble test.o
-	
-	test.o:     file format elf32-littlearm
-	
-	Disassembly of section .text:
-	
-	00000000 <test>:
-	   0:   b510            push    {r4, lr}
-	   2:   0612            lsl     r2, r2, #24
-	   4:   1c04            mov     r4, r0          (add r4, r0, #0)
-	   6:   0e10            lsr     r0, r2, #24
-	   8:   2200            mov     r2, #0
-	   a:   2900            cmp     r1, #0
-	   c:   dd04            ble     18 <test+0x18>
-	   e:   5ca3            ldrb    r3, [r4, r2]
-	  10:   3201            add     r2, #1
-	  12:   4018            and     r0, r3
-	  14:   428a            cmp     r2, r1
-	  16:   dbfa            blt     e <test+0xe>
-	  18:   bd10            pop     {r4, pc}
-	  1a:   46c0            nop                     (mov r8, r8)
-	
-
-	*/
-	u16 erase_check_code[] =
-	{
-		 0x0612,//            lsl     r2, r2, #24
-		 0x1c04,//            mov     r4, r0          (add r4, r0, #0)
-		 0x0e10,//            lsr     r0, r2, #24
-		 0x2200,//            mov     r2, #0
-		 0x2900,//            cmp     r1, #0
-		 0xdd04,//            ble     18 <test+0x18>
-		 0x5ca3,//            ldrb    r3, [r4, r2]
-		 0x3201,//            add     r2, #1
-		 0x4018,//            and     r0, r3
-		 0x428a,//            cmp     r2, r1
-		 0xdbfa,//            blt     e <test+0xe>
-		 0x46c0,//            nop                     (mov r8, r8)
-		 
-	};
-
+	return ERROR_OK;
+}
 
+int default_flash_blank_check(struct flash_bank_s *bank)
+{
+	target_t *target = bank->target;
+	int i;
+	int retval;
+	int fast_check = 0;
+	int blank;
 	
-	/* make sure we have a working area */
-	if (target_alloc_working_area(target, ((sizeof(erase_check_code)+3)/4)*4, &erase_check_algorithm) != ERROR_OK)
+	if (bank->target->state != TARGET_HALTED)
 	{
-		erase_check_algorithm = NULL;
+		return ERROR_TARGET_NOT_HALTED;
 	}
-	
-	if (erase_check_algorithm)
-	{
-		u8 erase_check_code_buf[((sizeof(erase_check_code)+3)/4)*4];
-		LOG_DEBUG("Running fast flash erase check");
 		
-		for (i = 0; i < sizeof(erase_check_code)/sizeof(*erase_check_code); i++)
-			target_buffer_set_u16(target, erase_check_code_buf + (i*2), erase_check_code[i]);
-
-		/* write algorithm code to working area */
-		if ((retval=target->type->write_memory(target, erase_check_algorithm->address, 2, sizeof(erase_check_code)/sizeof(*erase_check_code), erase_check_code_buf))==ERROR_OK)
-		{
-			for (i = 0; i < bank->num_sectors; i++)
-			{
-				u32 address = bank->base + bank->sectors[i].offset;
-				u32 size = bank->sectors[i].size;
-	
-				reg_param_t reg_params[3];
-				armv7m_algorithm_t arm_info;
-	
-				arm_info.common_magic = ARMV7M_COMMON_MAGIC;
-				arm_info.core_mode = ARMV7M_MODE_ANY;
-				arm_info.core_state = ARMV7M_STATE_THUMB;
-	
-				init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
-				buf_set_u32(reg_params[0].value, 0, 32, address);
-	
-				init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
-				buf_set_u32(reg_params[1].value, 0, 32, size);
-	
-				init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
-				buf_set_u32(reg_params[2].value, 0, 32, 0xff);
-	
-				if ((retval = target->type->run_algorithm(target, 0, NULL, 3, reg_params, erase_check_algorithm->address, 
-						erase_check_algorithm->address + sizeof(erase_check_code) - 2, 10000, &arm_info)) != ERROR_OK)
-					break;
-	
-				if (buf_get_u32(reg_params[2].value, 0, 32) == 0xff)
-					bank->sectors[i].is_erased = 1;
-				else
-					bank->sectors[i].is_erased = 0;
-	
-				destroy_reg_param(&reg_params[0]);
-				destroy_reg_param(&reg_params[1]);
-				destroy_reg_param(&reg_params[2]);
-			}
-			if (i == bank->num_sectors)
-			{
-				fast_check = 1;
-			}
-		} 
-		target_free_working_area(target, erase_check_algorithm);
-	}
-#endif
-	if (!fast_check)
+	for (i = 0; i < bank->num_sectors; i++)
 	{
-		/* try ARM7 instead */
-	
-		u32 erase_check_code[] =
-		{
-			0xe4d03001,	/* ldrb r3, [r0], #1	*/
-			0xe0022003, /* and r2, r2, r3 		*/
-			0xe2511001, /* subs r1, r1, #1		*/
-			0x1afffffb,	/* b -4 				*/
-			0xeafffffe	/* b 0 					*/
-		};
-
-		/* make sure we have a working area */
-		if (target_alloc_working_area(target, 20, &erase_check_algorithm) == ERROR_OK)
+		u32 address = bank->base + bank->sectors[i].offset;
+		u32 size = bank->sectors[i].size;
+		
+		if ((retval = target_blank_check_memory(target, address, size, &blank)) != ERROR_OK)
 		{
-			u8 erase_check_code_buf[5 * 4];
-
-			for (i = 0; i < 5; i++)
-				target_buffer_set_u32(target, erase_check_code_buf + (i*4), erase_check_code[i]);
-
-			/* write algorithm code to working area */
-			if ((retval=target->type->write_memory(target, erase_check_algorithm->address, 4, 5, erase_check_code_buf))==ERROR_OK)
-			{
-				for (i = 0; i < bank->num_sectors; i++)
-				{
-					u32 address = bank->base + bank->sectors[i].offset;
-					u32 size = bank->sectors[i].size;
-			
-					reg_param_t reg_params[3];
-					armv4_5_algorithm_t armv4_5_info;
-			
-					armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
-					armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
-					armv4_5_info.core_state = ARMV4_5_STATE_ARM;
-			
-					init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
-					buf_set_u32(reg_params[0].value, 0, 32, address);
-			
-					init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
-					buf_set_u32(reg_params[1].value, 0, 32, size);
-			
-					init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
-					buf_set_u32(reg_params[2].value, 0, 32, 0xff);
-			
-					if ((retval = target->type->run_algorithm(target, 0, NULL, 3, reg_params, 
-							erase_check_algorithm->address, erase_check_algorithm->address + 0x10, 10000, &armv4_5_info)) != ERROR_OK)
-						break;
-			
-					if (buf_get_u32(reg_params[2].value, 0, 32) == 0xff)
-						bank->sectors[i].is_erased = 1;
-					else
-						bank->sectors[i].is_erased = 0;
-			
-					destroy_reg_param(&reg_params[0]);
-					destroy_reg_param(&reg_params[1]);
-					destroy_reg_param(&reg_params[2]);
-				}
-				if (i == bank->num_sectors)
-				{
-					fast_check = 1;
-				}
-			} 
-			target_free_working_area(target, erase_check_algorithm);
+			fast_check = 0;
+			break;
 		}
+		if (blank == 0xFF)
+			bank->sectors[i].is_erased = 1;
+		else
+			bank->sectors[i].is_erased = 0;
+		fast_check = 1;
 	}
-
-	
+		
 	if (!fast_check)
 	{
 		LOG_USER("Running slow fallback erase check - add working memory");
-		for (i = 0; i < bank->num_sectors; i++)
-		{
-			int j;
-			bank->sectors[i].is_erased = 1;
-			
-			for (j=0; j<bank->sectors[i].size; j+=buffer_size)
-			{
-				int chunk;
-				int retval;
-				chunk=buffer_size;
-				if (chunk>(j-bank->sectors[i].size))
-				{
-					chunk=(j-bank->sectors[i].size);
-				}
-				
-				retval=target->type->read_memory(target, bank->base + bank->sectors[i].offset + j, 4, chunk/4, buffer);
-				if (retval!=ERROR_OK)
-					return retval;
-			
-				for (nBytes = 0; nBytes < chunk; nBytes++)
-				{
-					if (buffer[nBytes] != 0xFF)
-					{
-						bank->sectors[i].is_erased = 0;
-						break;
-					}
-				}
-			}
-		}
+		return default_flash_mem_blank_check(bank);
 	}
 	
 	return ERROR_OK;
diff --git a/src/flash/flash.h b/src/flash/flash.h
index e2f78855..e7a79f8f 100644
--- a/src/flash/flash.h
+++ b/src/flash/flash.h
@@ -78,7 +78,8 @@ extern int flash_erase_address_range(target_t *target, u32 addr, u32 length);
 extern int flash_write(target_t *target, image_t *image, u32 *written, int erase);
 extern void flash_set_dirty(void);
 extern int flash_get_bank_count();
-int default_flash_blank_check(struct flash_bank_s *bank);
+extern int default_flash_blank_check(struct flash_bank_s *bank);
+extern int default_flash_mem_blank_check(struct flash_bank_s *bank);
 
 extern flash_bank_t *get_flash_bank_by_num(int num);
 extern flash_bank_t *get_flash_bank_by_num_noprobe(int num);
diff --git a/src/flash/stellaris.c b/src/flash/stellaris.c
index e8c0a1c1..57049faa 100644
--- a/src/flash/stellaris.c
+++ b/src/flash/stellaris.c
@@ -70,7 +70,7 @@ flash_driver_t stellaris_flash =
 	.write = stellaris_write,
 	.probe = stellaris_probe,
 	.auto_probe = stellaris_auto_probe,
-	.erase_check = default_flash_blank_check,
+	.erase_check = default_flash_mem_blank_check,
 	.protect_check = stellaris_protect_check,
 	.info = stellaris_info
 };
diff --git a/src/flash/stm32x.c b/src/flash/stm32x.c
index 9ce16f7d..dcd59d2d 100644
--- a/src/flash/stm32x.c
+++ b/src/flash/stm32x.c
@@ -61,7 +61,7 @@ flash_driver_t stm32x_flash =
 	.write = stm32x_write,
 	.probe = stm32x_probe,
 	.auto_probe = stm32x_auto_probe,
-	.erase_check = default_flash_blank_check,
+	.erase_check = default_flash_mem_blank_check,
 	.protect_check = stm32x_protect_check,
 	.info = stm32x_info
 };
diff --git a/src/target/arm720t.c b/src/target/arm720t.c
index 9645db85..cc45c9e6 100644
--- a/src/target/arm720t.c
+++ b/src/target/arm720t.c
@@ -70,6 +70,7 @@ target_type_t arm720t_target =
 	.write_memory = arm720t_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 
diff --git a/src/target/arm7_9_common.c b/src/target/arm7_9_common.c
index 517badfd..b4ab4ef9 100644
--- a/src/target/arm7_9_common.c
+++ b/src/target/arm7_9_common.c
@@ -2305,6 +2305,69 @@ int arm7_9_checksum_memory(struct target_s *target, u32 address, u32 count, u32*
 	return ERROR_OK;
 }
 
+int arm7_9_blank_check_memory(struct target_s *target, u32 address, u32 count, u32* blank)
+{
+	working_area_t *erase_check_algorithm;
+	reg_param_t reg_params[3];
+	armv4_5_algorithm_t armv4_5_info;
+	int retval;
+	int i;
+	
+	u32 erase_check_code[] =
+	{
+						/* loop: */
+		0xe4d03001,		/* ldrb r3, [r0], #1	*/
+		0xe0022003,		/* and r2, r2, r3 		*/
+		0xe2511001, 	/* subs r1, r1, #1		*/
+		0x1afffffb,		/* bne loop				*/
+						/* end: */
+		0xeafffffe		/* b end				*/
+	};
+
+	/* make sure we have a working area */
+	if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
+	{
+		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+	}
+	
+	/* convert flash writing code into a buffer in target endianness */
+	for (i = 0; i < (sizeof(erase_check_code)/sizeof(u32)); i++)
+		target_write_u32(target, erase_check_algorithm->address + i*sizeof(u32), erase_check_code[i]);
+	
+	armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
+	armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
+	armv4_5_info.core_state = ARMV4_5_STATE_ARM;
+
+	init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
+	buf_set_u32(reg_params[0].value, 0, 32, address);
+
+	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
+	buf_set_u32(reg_params[1].value, 0, 32, count);
+
+	init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
+	buf_set_u32(reg_params[2].value, 0, 32, 0xff);
+	
+	if ((retval = target->type->run_algorithm(target, 0, NULL, 3, reg_params, 
+			erase_check_algorithm->address, erase_check_algorithm->address + (sizeof(erase_check_code) - 4), 10000, &armv4_5_info)) != ERROR_OK)
+	{
+		destroy_reg_param(&reg_params[0]);
+		destroy_reg_param(&reg_params[1]);
+		destroy_reg_param(&reg_params[2]);
+		target_free_working_area(target, erase_check_algorithm);
+		return 0;
+	}
+	
+	*blank = buf_get_u32(reg_params[2].value, 0, 32);
+	
+	destroy_reg_param(&reg_params[0]);
+	destroy_reg_param(&reg_params[1]);
+	destroy_reg_param(&reg_params[2]);
+	
+	target_free_working_area(target, erase_check_algorithm);
+	
+	return ERROR_OK;
+}
+
 int arm7_9_register_commands(struct command_context_s *cmd_ctx)
 {
 	command_t *arm7_9_cmd;
diff --git a/src/target/arm7_9_common.h b/src/target/arm7_9_common.h
index 21992faf..d6052f85 100644
--- a/src/target/arm7_9_common.h
+++ b/src/target/arm7_9_common.h
@@ -123,6 +123,7 @@ int arm7_9_read_memory(struct target_s *target, u32 address, u32 size, u32 count
 int arm7_9_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
 int arm7_9_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer);
 int arm7_9_checksum_memory(struct target_s *target, u32 address, u32 count, u32* checksum);
+int arm7_9_blank_check_memory(struct target_s *target, u32 address, u32 count, u32* blank);
 
 int arm7_9_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_prams, reg_param_t *reg_param, u32 entry_point, void *arch_info);
 
diff --git a/src/target/arm7tdmi.c b/src/target/arm7tdmi.c
index 549f6a67..16d1b136 100644
--- a/src/target/arm7tdmi.c
+++ b/src/target/arm7tdmi.c
@@ -75,6 +75,7 @@ target_type_t arm7tdmi_target =
 	.write_memory = arm7_9_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 	
diff --git a/src/target/arm920t.c b/src/target/arm920t.c
index 9e9bf1a5..3a3c2f1f 100644
--- a/src/target/arm920t.c
+++ b/src/target/arm920t.c
@@ -79,6 +79,7 @@ target_type_t arm920t_target =
 	.write_memory = arm920t_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 
diff --git a/src/target/arm926ejs.c b/src/target/arm926ejs.c
index f46760e5..ffa2b0d6 100644
--- a/src/target/arm926ejs.c
+++ b/src/target/arm926ejs.c
@@ -79,6 +79,7 @@ target_type_t arm926ejs_target =
 	.write_memory = arm926ejs_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 
diff --git a/src/target/arm966e.c b/src/target/arm966e.c
index 3112e0fc..af699cfa 100644
--- a/src/target/arm966e.c
+++ b/src/target/arm966e.c
@@ -70,6 +70,7 @@ target_type_t arm966e_target =
 	.write_memory = arm7_9_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 	
diff --git a/src/target/arm9tdmi.c b/src/target/arm9tdmi.c
index 24f3b2eb..90fb45aa 100644
--- a/src/target/arm9tdmi.c
+++ b/src/target/arm9tdmi.c
@@ -73,6 +73,7 @@ target_type_t arm9tdmi_target =
 	.write_memory = arm7_9_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 	
diff --git a/src/target/armv7m.c b/src/target/armv7m.c
index 950c5cda..b862cf38 100644
--- a/src/target/armv7m.c
+++ b/src/target/armv7m.c
@@ -596,4 +596,64 @@ int armv7m_checksum_memory(struct target_s *target, u32 address, u32 count, u32*
 	return ERROR_OK;
 }
 
+int armv7m_blank_check_memory(struct target_s *target, u32 address, u32 count, u32* blank)
+{
+	working_area_t *erase_check_algorithm;
+	reg_param_t reg_params[3];
+	armv7m_algorithm_t armv7m_info;
+	int retval;
+	int i;
+	
+	u16 erase_check_code[] =
+	{
+							/* loop: */
+		 0xF810, 0x3B01,	/* ldrb 	r3, [r0], #1 */
+		 0xEA02, 0x0203,	/* and 	r2, r2, r3 */
+		 0x3901,			/* subs 	r1, r1, #1 */
+		 0xD1F9,			/* bne		loop */
+		 					/* end: */
+		 0xE7FE,			/* b		end */
+	};
+
+	/* make sure we have a working area */
+	if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
+	{
+		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+	}
+	
+	/* convert flash writing code into a buffer in target endianness */
+	for (i = 0; i < (sizeof(erase_check_code)/sizeof(u16)); i++)
+		target_write_u16(target, erase_check_algorithm->address + i*sizeof(u16), erase_check_code[i]);
+	
+	armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
+	armv7m_info.core_mode = ARMV7M_MODE_ANY;
+
+	init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
+	buf_set_u32(reg_params[0].value, 0, 32, address);
+
+	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
+	buf_set_u32(reg_params[1].value, 0, 32, count);
+
+	init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
+	buf_set_u32(reg_params[2].value, 0, 32, 0xff);
 
+	if ((retval = target->type->run_algorithm(target, 0, NULL, 3, reg_params, 
+			erase_check_algorithm->address, erase_check_algorithm->address + (sizeof(erase_check_code)-2), 10000, &armv7m_info)) != ERROR_OK)
+	{
+		destroy_reg_param(&reg_params[0]);
+		destroy_reg_param(&reg_params[1]);
+		destroy_reg_param(&reg_params[2]);
+		target_free_working_area(target, erase_check_algorithm);
+		return 0;
+	}
+	
+	*blank = buf_get_u32(reg_params[2].value, 0, 32);
+	
+	destroy_reg_param(&reg_params[0]);
+	destroy_reg_param(&reg_params[1]);
+	destroy_reg_param(&reg_params[2]);
+	
+	target_free_working_area(target, erase_check_algorithm);
+	
+	return ERROR_OK;
+}
diff --git a/src/target/armv7m.h b/src/target/armv7m.h
index ebbf437f..d7d24adb 100644
--- a/src/target/armv7m.h
+++ b/src/target/armv7m.h
@@ -129,6 +129,7 @@ extern int armv7m_invalidate_core_regs(target_t *target);
 extern int armv7m_restore_context(target_t *target);
 
 extern int armv7m_checksum_memory(struct target_s *target, u32 address, u32 count, u32* checksum);
+extern int armv7m_blank_check_memory(struct target_s *target, u32 address, u32 count, u32* blank);
 
 /* Thumb mode instructions
  */
diff --git a/src/target/cortex_m3.c b/src/target/cortex_m3.c
index 58b620b5..845cca5f 100644
--- a/src/target/cortex_m3.c
+++ b/src/target/cortex_m3.c
@@ -81,6 +81,7 @@ target_type_t cortexm3_target =
 	.write_memory = cortex_m3_write_memory,
 	.bulk_write_memory = cortex_m3_bulk_write_memory,
 	.checksum_memory = armv7m_checksum_memory,
+	.blank_check_memory = armv7m_blank_check_memory,
 	
 	.run_algorithm = armv7m_run_algorithm,
 	
diff --git a/src/target/feroceon.c b/src/target/feroceon.c
index dc216292..a912dbd3 100644
--- a/src/target/feroceon.c
+++ b/src/target/feroceon.c
@@ -83,6 +83,7 @@ target_type_t feroceon_target =
 	.write_memory = arm926ejs_write_memory,
 	.bulk_write_memory = feroceon_bulk_write_memory,
 	.checksum_memory = arm7_9_checksum_memory,
+	.blank_check_memory = arm7_9_blank_check_memory,
 	
 	.run_algorithm = armv4_5_run_algorithm,
 
diff --git a/src/target/target.c b/src/target/target.c
index 8c479189..0a44e7b3 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -1136,6 +1136,23 @@ int target_checksum_memory(struct target_s *target, u32 address, u32 size, u32*
 	return retval;
 }
 
+int target_blank_check_memory(struct target_s *target, u32 address, u32 size, u32* blank)
+{
+	int retval;
+	if (!target->type->examined)
+	{
+		LOG_ERROR("Target not examined yet");
+		return ERROR_FAIL;
+	}
+	
+	if (target->type->blank_check_memory == 0)
+		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+	
+	retval = target->type->blank_check_memory(target, address, size, blank);
+			
+	return retval;
+}
+
 int target_read_u32(struct target_s *target, u32 address, u32 *value)
 {
 	u8 value_buf[4];
diff --git a/src/target/target.h b/src/target/target.h
index dd70170d..17ac94a5 100644
--- a/src/target/target.h
+++ b/src/target/target.h
@@ -159,6 +159,7 @@ typedef struct target_type_s
 	int (*bulk_write_memory)(struct target_s *target, u32 address, u32 count, u8 *buffer);
 	
 	int (*checksum_memory)(struct target_s *target, u32 address, u32 count, u32* checksum);
+	int (*blank_check_memory)(struct target_s *target, u32 address, u32 count, u32* blank);
 	
 	/* target break-/watchpoint control 
 	* rw: 0 = write, 1 = read, 2 = access
@@ -283,6 +284,7 @@ extern target_t* get_target_by_num(int num);
 extern int target_write_buffer(struct target_s *target, u32 address, u32 size, u8 *buffer);
 extern int target_read_buffer(struct target_s *target, u32 address, u32 size, u8 *buffer);
 extern int target_checksum_memory(struct target_s *target, u32 address, u32 size, u32* crc);
+extern int target_blank_check_memory(struct target_s *target, u32 address, u32 size, u32* blank);
 
 /* DANGER!!!!!
  * 
diff --git a/src/target/xscale.c b/src/target/xscale.c
index 48233243..a83ab70d 100644
--- a/src/target/xscale.c
+++ b/src/target/xscale.c
@@ -111,7 +111,8 @@ target_type_t xscale_target =
 	.write_memory = xscale_write_memory,
 	.bulk_write_memory = xscale_bulk_write_memory,
 	.checksum_memory = xscale_checksum_memory,
-
+	.blank_check_memory = NULL,
+	
 	.run_algorithm = armv4_5_run_algorithm,
 
 	.add_breakpoint = xscale_add_breakpoint,