John McCarthy <jgmcc@magma.ca> pic32mx flash fixups and speedups

git-svn-id: svn://svn.berlios.de/openocd/trunk@1301 b42882b7-edfa-0310-969c-e2dbd0fdcd60

4 files changed, 197 insertions, 61 deletions

diff --git a/src/flash/pic32mx.c b/src/flash/pic32mx.c
index c2593ce2..d9f71973 100644
--- a/src/flash/pic32mx.c
+++ b/src/flash/pic32mx.c
@@ -71,6 +71,8 @@ int pic32mx_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, cha
 int pic32mx_erase(struct flash_bank_s *bank, int first, int last);
 int pic32mx_protect(struct flash_bank_s *bank, int set, int first, int last);
 int pic32mx_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count);
+int pic32mx_write_row(struct flash_bank_s *bank, u32 address, u32 srcaddr);
+int pic32mx_write_word(struct flash_bank_s *bank, u32 address, u32 word);
 int pic32mx_probe(struct flash_bank_s *bank);
 int pic32mx_auto_probe(struct flash_bank_s *bank);
 int pic32mx_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
@@ -189,7 +191,6 @@ int pic32mx_nvm_exec(struct flash_bank_s *bank, u32 op, u32 timeout)
 int pic32mx_protect_check(struct flash_bank_s *bank)
 {
 	target_t *target = bank->target;
-	pic32mx_flash_bank_t *pic32mx_info = bank->driver_priv;
 
 	u32 devcfg0;
 	int s;
@@ -233,9 +234,9 @@ int pic32mx_erase(struct flash_bank_s *bank, int first, int last)
 		return ERROR_TARGET_NOT_HALTED;
 	}
 
-#if 0
 	if ((first == 0) && (last == (bank->num_sectors - 1)) && (bank->base == PIC32MX_KSEG0_PGM_FLASH || bank->base == PIC32MX_KSEG1_PGM_FLASH))
 	{
+		LOG_DEBUG("Erasing entire program flash");
 		status = pic32mx_nvm_exec(bank, NVMCON_OP_PFM_ERASE, 50);
 		if( status & NVMCON_NVMERR )
 			return ERROR_FLASH_OPERATION_FAILED;
@@ -243,11 +244,13 @@ int pic32mx_erase(struct flash_bank_s *bank, int first, int last)
 			return ERROR_FLASH_OPERATION_FAILED;
 		return ERROR_OK;
 	}
-#endif
 
 	for (i = first; i <= last; i++)
 	{
-		target_write_u32(target, PIC32MX_NVMADDR, bank->base + bank->sectors[i].offset);
+		if(bank->base >= PIC32MX_KSEG1_PGM_FLASH)
+			target_write_u32(target, PIC32MX_NVMADDR, KS1Virt2Phys(bank->base + bank->sectors[i].offset));
+		else
+			target_write_u32(target, PIC32MX_NVMADDR, KS0Virt2Phys(bank->base + bank->sectors[i].offset));
 
 		status = pic32mx_nvm_exec(bank, NVMCON_OP_PAGE_ERASE, 10);
 
@@ -354,15 +357,14 @@ int pic32mx_protect(struct flash_bank_s *bank, int set, int first, int last)
 
 int pic32mx_write_block(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 {
-	pic32mx_flash_bank_t *pic32mx_info = bank->driver_priv;
 	target_t *target = bank->target;
-	u32 buffer_size = 8192;
+	u32 buffer_size = 512;
 	working_area_t *source;
 	u32 address = bank->base + offset;
-	reg_param_t reg_params[4];
+	int retval = ERROR_OK;
 #if 0
+	pic32mx_flash_bank_t *pic32mx_info = bank->driver_priv;
 	armv7m_algorithm_t armv7m_info;
-	int retval = ERROR_OK;
 
 	u8 pic32mx_flash_write_code[] = {
 									/* write: */
@@ -395,40 +397,34 @@ int pic32mx_write_block(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 c
 
 	if ((retval=target_write_buffer(target, pic32mx_info->write_algorithm->address, sizeof(pic32mx_flash_write_code), pic32mx_flash_write_code))!=ERROR_OK)
 		return retval;
+#endif
 
 	/* memory buffer */
-	while (target_alloc_working_area(target, buffer_size, &source) != ERROR_OK)
+	if (target_alloc_working_area(target, buffer_size, &source) != ERROR_OK)
 	{
-		buffer_size /= 2;
-		if (buffer_size <= 256)
-		{
-			/* if we already allocated the writing code, but failed to get a buffer, free the algorithm */
-			if (pic32mx_info->write_algorithm)
-				target_free_working_area(target, pic32mx_info->write_algorithm);
-
-			LOG_WARNING("no large enough working area available, can't do block memory writes");
-			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
-		}
-	};
-
-	armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
-	armv7m_info.core_mode = ARMV7M_MODE_ANY;
+#if 0
+		/* if we already allocated the writing code, but failed to get a buffer, free the algorithm */
+		if (pic32mx_info->write_algorithm)
+			target_free_working_area(target, pic32mx_info->write_algorithm);
+#endif
 
-	init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
-	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
-	init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
-	init_reg_param(&reg_params[3], "r3", 32, PARAM_IN);
+		LOG_WARNING("no large enough working area available, can't do block memory writes");
+		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+	}
 
-	while (count > 0)
+	while (count >= buffer_size/4)
 	{
-		u32 thisrun_count = (count > (buffer_size / 2)) ? (buffer_size / 2) : count;
+		u32 status;
 
-		if ((retval = target_write_buffer(target, source->address, thisrun_count * 2, buffer))!=ERROR_OK)
+		if ((retval = target_write_buffer(target, source->address, buffer_size, buffer))!=ERROR_OK) {
+			LOG_ERROR("Failed to write row buffer (%d words) to RAM", buffer_size/4);
 			break;
+		}
 
+#if 0
 		buf_set_u32(reg_params[0].value, 0, 32, source->address);
 		buf_set_u32(reg_params[1].value, 0, 32, address);
-		buf_set_u32(reg_params[2].value, 0, 32, thisrun_count);
+		buf_set_u32(reg_params[2].value, 0, 32, buffer_size/4);
 
 		if ((retval = target->type->run_algorithm(target, 0, NULL, 4, reg_params, pic32mx_info->write_algorithm->address, \
 				pic32mx_info->write_algorithm->address + (sizeof(pic32mx_flash_write_code) - 10), 10000, &armv7m_info)) != ERROR_OK)
@@ -443,39 +439,86 @@ int pic32mx_write_block(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 c
 			retval = ERROR_FLASH_OPERATION_FAILED;
 			break;
 		}
+#endif
+		status = pic32mx_write_row(bank, address, source->address);
+		if( status & NVMCON_NVMERR ) {
+			LOG_ERROR("Flash write error NVMERR (status=0x%08x)", status);
+			retval = ERROR_FLASH_OPERATION_FAILED;
+			break;
+		}
+		if( status & NVMCON_LVDERR ) {
+			LOG_ERROR("Flash write error LVDERR (status=0x%08x)", status);
+			retval = ERROR_FLASH_OPERATION_FAILED;
+			break;
+		}
 
-		buffer += thisrun_count * 2;
-		address += thisrun_count * 2;
-		count -= thisrun_count;
+		buffer  += buffer_size;
+		address += buffer_size;
+		count   -= buffer_size/4;
 	}
 
 	target_free_working_area(target, source);
-	target_free_working_area(target, pic32mx_info->write_algorithm);
 
-	destroy_reg_param(&reg_params[0]);
-	destroy_reg_param(&reg_params[1]);
-	destroy_reg_param(&reg_params[2]);
-	destroy_reg_param(&reg_params[3]);
+	while(count > 0)
+	{
+		u32 status;
+
+		status = pic32mx_write_word(bank, address, *(u32*)buffer);
+		if( status & NVMCON_NVMERR ) {
+			LOG_ERROR("Flash write error NVMERR (status=0x%08x)", status);
+			retval = ERROR_FLASH_OPERATION_FAILED;
+			break;
+		}
+		if( status & NVMCON_LVDERR ) {
+			LOG_ERROR("Flash write error LVDERR (status=0x%08x)", status);
+			retval = ERROR_FLASH_OPERATION_FAILED;
+			break;
+		}
+
+		buffer  += 4;
+		address += 4;
+		count--;
+	}
 
 	return retval;
-#else
-	return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
-#endif
 }
 
 int pic32mx_write_word(struct flash_bank_s *bank, u32 address, u32 word)
 {
 	target_t *target = bank->target;
 
-	target_write_u32(target, PIC32MX_NVMADDR, address);
+	if(bank->base >= PIC32MX_KSEG1_PGM_FLASH)
+		target_write_u32(target, PIC32MX_NVMADDR, KS1Virt2Phys(address));
+	else
+		target_write_u32(target, PIC32MX_NVMADDR, KS0Virt2Phys(address));
 	target_write_u32(target, PIC32MX_NVMDATA, word);
 
 	return pic32mx_nvm_exec(bank, NVMCON_OP_WORD_PROG, 5);
 }
 
-int pic32mx_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
+/*
+ * Write a 128 word (512 byte) row to flash address from RAM srcaddr.
+ */
+int pic32mx_write_row(struct flash_bank_s *bank, u32 address, u32 srcaddr)
 {
 	target_t *target = bank->target;
+
+	LOG_DEBUG("addr: 0x%08x srcaddr: 0x%08x", address, srcaddr);
+
+	if(address >= PIC32MX_KSEG1_PGM_FLASH)
+		target_write_u32(target, PIC32MX_NVMADDR,    KS1Virt2Phys(address));
+	else
+		target_write_u32(target, PIC32MX_NVMADDR,    KS0Virt2Phys(address));
+	if(srcaddr >= PIC32MX_KSEG1_RAM)
+		target_write_u32(target, PIC32MX_NVMSRCADDR, KS1Virt2Phys(srcaddr));
+	else
+		target_write_u32(target, PIC32MX_NVMSRCADDR, KS0Virt2Phys(srcaddr));
+
+	return pic32mx_nvm_exec(bank, NVMCON_OP_ROW_PROG, 100);
+}
+
+int pic32mx_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
+{
 	u32 words_remaining = (count / 4);
 	u32 bytes_remaining = (count & 0x00000003);
 	u32 address = bank->base + offset;
@@ -862,7 +905,6 @@ int pic32mx_handle_pgm_word_command(struct command_context_s *cmd_ctx, char *cmd
 {
 	flash_bank_t *bank;
 	u32 address, value;
-	int i;
 	int status, res;
 
 	if (argc != 3)
diff --git a/src/flash/pic32mx.h b/src/flash/pic32mx.h
index 28921f5e..f799a467 100644
--- a/src/flash/pic32mx.h
+++ b/src/flash/pic32mx.h
@@ -42,22 +42,31 @@ typedef struct pic32mx_flash_bank_s
 /* pic32mx memory locations */
 
 #define PIC32MX_KUSEG_PGM_FLASH		0x7D000000
-#define PIC32MX_KUSEG_RAM		0x7F000000
+#define PIC32MX_KUSEG_RAM			0x7F000000
 
-#define PIC32MX_KSEG0_RAM		0x80000000
+#define PIC32MX_KSEG0_RAM			0x80000000
 #define PIC32MX_KSEG0_PGM_FLASH		0x9D000000
 #define PIC32MX_KSEG0_BOOT_FLASH	0x9FC00000
 
-#define PIC32MX_KSEG1_RAM		0xA0000000
+#define PIC32MX_KSEG1_RAM			0xA0000000
 #define PIC32MX_KSEG1_PGM_FLASH		0xBD000000
 #define PIC32MX_KSEG1_PERIPHERAL	0xBF800000
 #define PIC32MX_KSEG1_BOOT_FLASH	0xBFC00000
 
-#define PIC32MX_PHYS_RAM		0x00000000
+#define PIC32MX_PHYS_RAM			0x00000000
 #define PIC32MX_PHYS_PGM_FLASH		0x1D000000
 #define PIC32MX_PHYS_PERIPHERALS	0x1F800000
 #define PIC32MX_PHYS_BOOT_FLASH		0x1FC00000
 
+/*
+ * Translate Virtual and Physical addresses.
+ * Note: These macros only work for KSEG0/KSEG1 addresses.
+ */
+#define KS1Virt2Phys(vaddr)			((vaddr)-0xA0000000)
+#define Phys2KS1Virt(paddr)			((paddr)+0xA0000000)
+#define KS0Virt2Phys(vaddr)			((vaddr)-0x80000000)
+#define Phys2KS0Virt(paddr)			((paddr)+0x80000000)
+
 /* pic32mx configuration register locations */
 
 #define PIC32MX_DEVCFG0		0xBFC02FFC
@@ -77,11 +86,11 @@ typedef struct pic32mx_flash_bank_s
 #define NVMCON_NVMERR		(1<<13)
 #define NVMCON_LVDERR		(1<<12)
 #define NVMCON_LVDSTAT		(1<<11)
-#define NVMCON_OP_PFM_ERASE	0x5
+#define NVMCON_OP_PFM_ERASE		0x5
 #define NVMCON_OP_PAGE_ERASE	0x4
-#define NVMCON_OP_ROW_PROG	0x3
-#define NVMCON_OP_WORD_PROG	0x1
-#define NVMCON_OP_NOP		0x0
+#define NVMCON_OP_ROW_PROG		0x3
+#define NVMCON_OP_WORD_PROG		0x1
+#define NVMCON_OP_NOP			0x0
 
 #define PIC32MX_NVMKEY		0xBF80F410
 #define PIC32MX_NVMADDR		0xBF80F420
diff --git a/src/target/mips32_pracc.c b/src/target/mips32_pracc.c
index d641956d..2511b078 100644
--- a/src/target/mips32_pracc.c
+++ b/src/target/mips32_pracc.c
@@ -218,7 +218,10 @@ int mips32_pracc_read_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int coun
 		case 2:
 			return mips32_pracc_read_mem16(ejtag_info, addr, count, (u16*)buf);
 		case 4:
-			return mips32_pracc_read_mem32(ejtag_info, addr, count, (u32*)buf);
+			if(count==1)
+				return mips32_pracc_read_u32(ejtag_info, addr, (u32*)buf);
+			else
+				return mips32_pracc_read_mem32(ejtag_info, addr, count, (u32*)buf);
 	}
 	
 	return ERROR_OK;
@@ -247,8 +250,8 @@ int mips32_pracc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *
 		MIPS32_BEQ(0,10,9),									/* beq 0, $10, end */
 		MIPS32_NOP,
 		
-		MIPS32_LW(12,0,9), 									/* lw $12,0($9), Load $12 with the word @mem[$9] */
-		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		MIPS32_LW(8,0,9), 									/* lw $8,0($9), Load $8 with the word @mem[$9] */
+		MIPS32_SW(8,0,11), 									/* sw $8,0($11) */
 		
 		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
 		MIPS32_ADDI(9,9,4), 								/* $1+=4 */
@@ -298,6 +301,47 @@ int mips32_pracc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *
 	return retval;
 }
 
+int mips32_pracc_read_u32(mips_ejtag_t *ejtag_info, u32 addr, u32 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+
+		MIPS32_LUI(8,UPPER16(MIPS32_PRACC_PARAM_IN)),		/* $8 = MIPS32_PRACC_PARAM_IN */
+		MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_PARAM_IN)),
+		MIPS32_LW(8,0,8),									/* $8=mem[$8]; read addr */
+		MIPS32_LUI(9,UPPER16(MIPS32_PRACC_PARAM_OUT)), 		/* $9=MIPS32_PRACC_PARAM_OUT */
+		MIPS32_ORI(9,9,LOWER16(MIPS32_PRACC_PARAM_OUT)),
+
+		MIPS32_LW(8,0,8), 									/* lw $8,0($8), Load $8 with the word @mem[$8] */
+		MIPS32_SW(8,0,9), 									/* sw $8,0($9) */
+
+		MIPS32_LW(9,0,15), 									/* lw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* lw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(17)),								/* b start */
+		MIPS32_NOP,
+	};
+
+	int retval = ERROR_OK;
+	u32 param_in[1];
+
+	param_in[0] = addr;
+
+	if ((retval = mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, 
+		sizeof(param_in)/sizeof(param_in[0]), param_in, sizeof(u32), buf, 1)) != ERROR_OK)
+	{
+		return retval;
+	}
+
+	return retval;
+}
+
 int mips32_pracc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
 {
 	u32 code[] = {
@@ -321,8 +365,8 @@ int mips32_pracc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *
 		MIPS32_BEQ(0,10,9), 								/* beq 0, $10, end */
 		MIPS32_NOP,
 		
-		MIPS32_LHU(12,0,9), 								/* lw $12,0($9), Load $12 with the halfword @mem[$9] */
-		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		MIPS32_LHU(8,0,9), 									/* lw $8,0($9), Load $8 with the halfword @mem[$9] */
+		MIPS32_SW(8,0,11), 									/* sw $8,0($11) */
 		
 		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
 		MIPS32_ADDI(9,9,2), 								/* $9+=2 */
@@ -400,8 +444,8 @@ int mips32_pracc_read_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *bu
 		MIPS32_BEQ(0,10,9), 								/* beq 0, $10, end */
 		MIPS32_NOP,
 		
-		MIPS32_LBU(12,0,9), 								/* lw $12,0($9), Load t4 with the byte @mem[t1] */
-		MIPS32_SW(12,0,11), 								/* sw $12,0($11) */
+		MIPS32_LBU(8,0,9), 									/* lw $8,0($9), Load t4 with the byte @mem[t1] */
+		MIPS32_SW(8,0,11), 									/* sw $8,0($11) */
 		
 		MIPS32_ADDI(10,10,NEG16(1)), 						/* $10-- */
 		MIPS32_ADDI(9,9,1), 								/* $9+=1 */
@@ -465,7 +509,10 @@ int mips32_pracc_write_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int cou
 		case 2:
 			return mips32_pracc_write_mem16(ejtag_info, addr, count,(u16*)buf);
 		case 4:
-			return mips32_pracc_write_mem32(ejtag_info, addr, count, (u32*)buf);
+			if(count==1)
+				return mips32_pracc_write_u32(ejtag_info, addr, (u32*)buf);
+			else
+				return mips32_pracc_write_mem32(ejtag_info, addr, count, (u32*)buf);
 	}
 	
 	return ERROR_OK;
@@ -526,6 +573,42 @@ int mips32_pracc_write_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32
 	return ERROR_OK;
 }
 
+int mips32_pracc_write_u32(mips_ejtag_t *ejtag_info, u32 addr, u32 *buf)
+{
+	u32 code[] = {
+															/* start: */
+		MIPS32_MTC0(15,31,0),								/* move $15 to COP0 DeSave */
+		MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), 		/* $15 = MIPS32_PRACC_STACK */
+		MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
+		MIPS32_SW(8,0,15), 									/* sw $8,($15) */
+		MIPS32_SW(9,0,15), 									/* sw $9,($15) */
+
+		MIPS32_LUI(8,UPPER16((MIPS32_PRACC_PARAM_IN+4))), 	/* $8 = MIPS32_PRACC_PARAM_IN+4 */
+		MIPS32_ORI(8,8,LOWER16((MIPS32_PRACC_PARAM_IN+4))),
+		MIPS32_LW(9,NEG16(4),8), 							/* Load write addr to $9 */
+
+		MIPS32_LW(8,0,8), 									/* lw $8,0($8), Load $8 with the word @mem[$8] */
+		MIPS32_SW(8,0,9), 									/* sw $8,0($9) */
+
+		MIPS32_LW(9,0,15), 									/* lw $9,($15) */
+		MIPS32_LW(8,0,15), 									/* lw $8,($15) */
+		MIPS32_MFC0(15,31,0),								/* move COP0 DeSave to $15 */
+		MIPS32_NOP,
+		MIPS32_B(NEG16(15)),								/* b start */
+		MIPS32_NOP,
+	};
+
+	/* TODO remove array */
+	u32 param_in[1+1];
+	param_in[0] = addr;
+	param_in[1] = *buf;
+
+	mips32_pracc_exec(ejtag_info, sizeof(code)/sizeof(code[0]), code, \
+		sizeof(param_in)/sizeof(param_in[0]),param_in, 0, NULL, 1);
+
+	return ERROR_OK;
+}
+
 int mips32_pracc_write_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
 {
 	u32 code[] = {
diff --git a/src/target/mips32_pracc.h b/src/target/mips32_pracc.h
index d452964c..31a91fdc 100644
--- a/src/target/mips32_pracc.h
+++ b/src/target/mips32_pracc.h
@@ -42,10 +42,12 @@ extern int mips32_pracc_write_mem(mips_ejtag_t *ejtag_info, u32 addr, int size,
 extern int mips32_pracc_read_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf);
 extern int mips32_pracc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf);
 extern int mips32_pracc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf);
+extern int mips32_pracc_read_u32(mips_ejtag_t *ejtag_info, u32 addr, u32 *buf);
 
 extern int mips32_pracc_write_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf);
 extern int mips32_pracc_write_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf);
 extern int mips32_pracc_write_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf);
+extern int mips32_pracc_write_u32(mips_ejtag_t *ejtag_info, u32 addr, u32 *buf);
 
 extern int mips32_pracc_read_regs(mips_ejtag_t *ejtag_info, u32 *regs);
 extern int mips32_pracc_write_regs(mips_ejtag_t *ejtag_info, u32 *regs);