1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2006 by Magnus Lundin *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
11 * Copyright (C) 2007,2008 Øyvind Harboe *
12 * oyvind.harboe@zylin.com *
14 * This program is free software; you can redistribute it and/or modify *
15 * it under the terms of the GNU General Public License as published by *
16 * the Free Software Foundation; either version 2 of the License, or *
17 * (at your option) any later version. *
19 * This program is distributed in the hope that it will be useful, *
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
22 * GNU General Public License for more details. *
24 * You should have received a copy of the GNU General Public License *
25 * along with this program; if not, write to the *
26 * Free Software Foundation, Inc., *
27 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
28 ***************************************************************************/
33 #include "replacements.h"
46 #define _DEBUG_INSTRUCTION_EXECUTION_
49 char* armv7m_mode_strings[] =
51 "Thread", "Thread (User)", "Handler",
54 char* armv7m_exception_strings[] =
56 "", "Reset", "NMI", "HardFault", "MemManage", "BusFault", "UsageFault", "RESERVED", "RESERVED", "RESERVED", "RESERVED",
57 "SVCall", "DebugMonitor", "RESERVED", "PendSV", "SysTick"
60 char* armv7m_core_reg_list[] =
62 /* Registers accessed through core debug */
63 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12",
66 /* Registers accessed through special reg 20 */
67 "primask", "basepri", "faultmask", "control"
70 u8 armv7m_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
72 reg_t armv7m_gdb_dummy_fp_reg =
74 "GDB dummy floating-point register", armv7m_gdb_dummy_fp_value, 0, 1, 96, NULL, 0, NULL, 0
77 u8 armv7m_gdb_dummy_fps_value[] = {0, 0, 0, 0};
79 reg_t armv7m_gdb_dummy_fps_reg =
81 "GDB dummy floating-point status register", armv7m_gdb_dummy_fps_value, 0, 1, 32, NULL, 0, NULL, 0
84 #ifdef ARMV7_GDB_HACKS
85 u8 armv7m_gdb_dummy_cpsr_value[] = {0, 0, 0, 0};
87 reg_t armv7m_gdb_dummy_cpsr_reg =
89 "GDB dummy cpsr register", armv7m_gdb_dummy_cpsr_value, 0, 1, 32, NULL, 0, NULL, 0
93 armv7m_core_reg_t armv7m_core_reg_list_arch_info[] =
95 /* CORE_GP are accesible using the core debug registers */
96 {0, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
97 {1, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
98 {2, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
99 {3, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
100 {4, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
101 {5, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
102 {6, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
103 {7, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
104 {8, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
105 {9, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
106 {10, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
107 {11, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
108 {12, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
109 {13, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
110 {14, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
111 {15, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL},
113 {16, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* xPSR */
114 {17, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* MSP */
115 {18, ARMV7M_REGISTER_CORE_GP, ARMV7M_MODE_ANY, NULL, NULL}, /* PSP */
117 /* CORE_SP are accesible using coreregister 20 */
118 {19, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* PRIMASK */
119 {20, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* BASEPRI */
120 {21, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL}, /* FAULTMASK */
121 {22, ARMV7M_REGISTER_CORE_SP, ARMV7M_MODE_ANY, NULL, NULL} /* CONTROL */
124 int armv7m_core_reg_arch_type = -1;
125 int armv7m_dummy_core_reg_arch_type = -1;
127 int armv7m_restore_context(target_t *target)
131 /* get pointers to arch-specific information */
132 armv7m_common_t *armv7m = target->arch_info;
136 if (armv7m->pre_restore_context)
137 armv7m->pre_restore_context(target);
139 for (i = ARMV7NUMCOREREGS-1; i >= 0; i--)
141 if (armv7m->core_cache->reg_list[i].dirty)
143 armv7m->write_core_reg(target, i);
147 if (armv7m->post_restore_context)
148 armv7m->post_restore_context(target);
153 /* Core state functions */
154 char *armv7m_exception_string(int number)
156 static char enamebuf[32];
158 if ((number < 0) | (number > 511))
159 return "Invalid exception";
161 return armv7m_exception_strings[number];
162 sprintf(enamebuf, "External Interrupt(%i)", number - 16);
166 int armv7m_get_core_reg(reg_t *reg)
169 armv7m_core_reg_t *armv7m_reg = reg->arch_info;
170 target_t *target = armv7m_reg->target;
171 armv7m_common_t *armv7m_target = target->arch_info;
173 if (target->state != TARGET_HALTED)
175 return ERROR_TARGET_NOT_HALTED;
178 retval = armv7m_target->read_core_reg(target, armv7m_reg->num);
183 int armv7m_set_core_reg(reg_t *reg, u8 *buf)
185 armv7m_core_reg_t *armv7m_reg = reg->arch_info;
186 target_t *target = armv7m_reg->target;
187 u32 value = buf_get_u32(buf, 0, 32);
189 if (target->state != TARGET_HALTED)
191 return ERROR_TARGET_NOT_HALTED;
194 buf_set_u32(reg->value, 0, 32, value);
201 int armv7m_read_core_reg(struct target_s *target, int num)
205 armv7m_core_reg_t * armv7m_core_reg;
207 /* get pointers to arch-specific information */
208 armv7m_common_t *armv7m = target->arch_info;
210 if ((num < 0) || (num >= ARMV7NUMCOREREGS))
211 return ERROR_INVALID_ARGUMENTS;
213 armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
214 retval = armv7m->load_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, ®_value);
215 buf_set_u32(armv7m->core_cache->reg_list[num].value, 0, 32, reg_value);
216 armv7m->core_cache->reg_list[num].valid = 1;
217 armv7m->core_cache->reg_list[num].dirty = 0;
222 int armv7m_write_core_reg(struct target_s *target, int num)
226 armv7m_core_reg_t *armv7m_core_reg;
228 /* get pointers to arch-specific information */
229 armv7m_common_t *armv7m = target->arch_info;
231 if ((num < 0) || (num >= ARMV7NUMCOREREGS))
232 return ERROR_INVALID_ARGUMENTS;
234 reg_value = buf_get_u32(armv7m->core_cache->reg_list[num].value, 0, 32);
235 armv7m_core_reg = armv7m->core_cache->reg_list[num].arch_info;
236 retval = armv7m->store_core_reg_u32(target, armv7m_core_reg->type, armv7m_core_reg->num, reg_value);
237 if (retval != ERROR_OK)
239 LOG_ERROR("JTAG failure");
240 armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
241 return ERROR_JTAG_DEVICE_ERROR;
243 LOG_DEBUG("write core reg %i value 0x%x", num , reg_value);
244 armv7m->core_cache->reg_list[num].valid = 1;
245 armv7m->core_cache->reg_list[num].dirty = 0;
250 int armv7m_invalidate_core_regs(target_t *target)
252 /* get pointers to arch-specific information */
253 armv7m_common_t *armv7m = target->arch_info;
256 for (i = 0; i < armv7m->core_cache->num_regs; i++)
258 armv7m->core_cache->reg_list[i].valid = 0;
259 armv7m->core_cache->reg_list[i].dirty = 0;
265 int armv7m_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size)
267 /* get pointers to arch-specific information */
268 armv7m_common_t *armv7m = target->arch_info;
272 *reg_list = malloc(sizeof(reg_t*) * (*reg_list_size));
274 for (i = 0; i < 16; i++)
276 (*reg_list)[i] = &armv7m->core_cache->reg_list[i];
279 for (i = 16; i < 24; i++)
281 (*reg_list)[i] = &armv7m_gdb_dummy_fp_reg;
284 (*reg_list)[24] = &armv7m_gdb_dummy_fps_reg;
286 #ifdef ARMV7_GDB_HACKS
287 /* use dummy cpsr reg otherwise gdb may try and set the thumb bit */
288 (*reg_list)[25] = &armv7m_gdb_dummy_cpsr_reg;
290 /* ARMV7M is always in thumb mode, try to make GDB understand this
291 * if it does not support this arch */
292 armv7m->core_cache->reg_list[15].value[0] |= 1;
294 (*reg_list)[25] = &armv7m->core_cache->reg_list[ARMV7M_xPSR];
300 int armv7m_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_params, reg_param_t *reg_params, u32 entry_point, u32 exit_point, int timeout_ms, void *arch_info)
302 /* get pointers to arch-specific information */
303 armv7m_common_t *armv7m = target->arch_info;
304 armv7m_algorithm_t *armv7m_algorithm_info = arch_info;
305 enum armv7m_mode core_mode = armv7m->core_mode;
306 int retval = ERROR_OK;
309 u32 context[ARMV7NUMCOREREGS];
311 if (armv7m_algorithm_info->common_magic != ARMV7M_COMMON_MAGIC)
313 LOG_ERROR("current target isn't an ARMV7M target");
314 return ERROR_TARGET_INVALID;
317 if (target->state != TARGET_HALTED)
319 LOG_WARNING("target not halted");
320 return ERROR_TARGET_NOT_HALTED;
323 /* refresh core register cache */
324 /* Not needed if core register cache is always consistent with target process state */
325 for (i = 0; i < ARMV7NUMCOREREGS; i++)
327 if (!armv7m->core_cache->reg_list[i].valid)
328 armv7m->read_core_reg(target, i);
329 context[i] = buf_get_u32(armv7m->core_cache->reg_list[i].value, 0, 32);
332 for (i = 0; i < num_mem_params; i++)
334 target_write_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value);
337 for (i = 0; i < num_reg_params; i++)
339 reg_t *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
344 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
348 if (reg->size != reg_params[i].size)
350 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
354 regvalue = buf_get_u32(reg_params[i].value, 0, 32);
355 armv7m_set_core_reg(reg, reg_params[i].value);
358 if (armv7m_algorithm_info->core_mode != ARMV7M_MODE_ANY)
360 LOG_DEBUG("setting core_mode: 0x%2.2x", armv7m_algorithm_info->core_mode);
361 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1, armv7m_algorithm_info->core_mode);
362 armv7m->core_cache->reg_list[ARMV7M_CONTROL].dirty = 1;
363 armv7m->core_cache->reg_list[ARMV7M_CONTROL].valid = 1;
366 /* ARMV7M always runs in Thumb state */
367 if ((retval = breakpoint_add(target, exit_point, 2, BKPT_SOFT)) != ERROR_OK)
369 LOG_ERROR("can't add breakpoint to finish algorithm execution");
370 return ERROR_TARGET_FAILURE;
373 /* This code relies on the target specific resume() and poll()->debug_entry()
374 sequence to write register values to the processor and the read them back */
375 if((retval = target_resume(target, 0, entry_point, 1, 1)) != ERROR_OK)
379 if((retval = target_poll(target)) != ERROR_OK)
384 if((retval = target_wait_state(target, TARGET_HALTED, timeout_ms)) != ERROR_OK)
388 if (target->state != TARGET_HALTED)
390 if ((retval=target_halt(target))!=ERROR_OK)
392 if ((retval=target_wait_state(target, TARGET_HALTED, 500))!=ERROR_OK)
396 return ERROR_TARGET_TIMEOUT;
400 armv7m->load_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 15, &pc);
401 if (pc != exit_point)
403 LOG_DEBUG("failed algoritm halted at 0x%x ", pc);
404 return ERROR_TARGET_TIMEOUT;
407 breakpoint_remove(target, exit_point);
409 /* Read memory values to mem_params[] */
410 for (i = 0; i < num_mem_params; i++)
412 if (mem_params[i].direction != PARAM_OUT)
413 if((retval = target_read_buffer(target, mem_params[i].address, mem_params[i].size, mem_params[i].value)) != ERROR_OK)
419 /* Copy core register values to reg_params[] */
420 for (i = 0; i < num_reg_params; i++)
422 if (reg_params[i].direction != PARAM_OUT)
424 reg_t *reg = register_get_by_name(armv7m->core_cache, reg_params[i].reg_name, 0);
428 LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
432 if (reg->size != reg_params[i].size)
434 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params[i].reg_name);
438 buf_set_u32(reg_params[i].value, 0, 32, buf_get_u32(reg->value, 0, 32));
442 for (i = ARMV7NUMCOREREGS-1; i >= 0; i--)
444 LOG_DEBUG("restoring register %s with value 0x%8.8x", armv7m->core_cache->reg_list[i].name, context[i]);
445 buf_set_u32(armv7m->core_cache->reg_list[i].value, 0, 32, context[i]);
446 armv7m->core_cache->reg_list[i].valid = 1;
447 armv7m->core_cache->reg_list[i].dirty = 1;
450 armv7m->core_mode = core_mode;
455 int armv7m_arch_state(struct target_s *target)
457 /* get pointers to arch-specific information */
458 armv7m_common_t *armv7m = target->arch_info;
460 LOG_USER("target halted due to %s, current mode: %s %s\nxPSR: 0x%8.8x pc: 0x%8.8x",
461 Jim_Nvp_value2name_simple( nvp_target_debug_reason,target->debug_reason)->name,
462 armv7m_mode_strings[armv7m->core_mode],
463 armv7m_exception_string(armv7m->exception_number),
464 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32),
465 buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32));
470 reg_cache_t *armv7m_build_reg_cache(target_t *target)
472 /* get pointers to arch-specific information */
473 armv7m_common_t *armv7m = target->arch_info;
475 int num_regs = ARMV7NUMCOREREGS;
476 reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
477 reg_cache_t *cache = malloc(sizeof(reg_cache_t));
478 reg_t *reg_list = malloc(sizeof(reg_t) * num_regs);
479 armv7m_core_reg_t *arch_info = malloc(sizeof(armv7m_core_reg_t) * num_regs);
482 if (armv7m_core_reg_arch_type == -1)
484 armv7m_core_reg_arch_type = register_reg_arch_type(armv7m_get_core_reg, armv7m_set_core_reg);
487 register_init_dummy(&armv7m_gdb_dummy_fps_reg);
488 #ifdef ARMV7_GDB_HACKS
489 register_init_dummy(&armv7m_gdb_dummy_cpsr_reg);
491 register_init_dummy(&armv7m_gdb_dummy_fp_reg);
493 /* Build the process context cache */
494 cache->name = "arm v7m registers";
496 cache->reg_list = reg_list;
497 cache->num_regs = num_regs;
499 armv7m->core_cache = cache;
501 for (i = 0; i < num_regs; i++)
503 arch_info[i] = armv7m_core_reg_list_arch_info[i];
504 arch_info[i].target = target;
505 arch_info[i].armv7m_common = armv7m;
506 reg_list[i].name = armv7m_core_reg_list[i];
507 reg_list[i].size = 32;
508 reg_list[i].value = calloc(1, 4);
509 reg_list[i].dirty = 0;
510 reg_list[i].valid = 0;
511 reg_list[i].bitfield_desc = NULL;
512 reg_list[i].num_bitfields = 0;
513 reg_list[i].arch_type = armv7m_core_reg_arch_type;
514 reg_list[i].arch_info = &arch_info[i];
520 int armv7m_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
522 armv7m_build_reg_cache(target);
527 int armv7m_init_arch_info(target_t *target, armv7m_common_t *armv7m)
529 /* register arch-specific functions */
531 target->arch_info = armv7m;
532 armv7m->read_core_reg = armv7m_read_core_reg;
533 armv7m->write_core_reg = armv7m_write_core_reg;
538 int armv7m_register_commands(struct command_context_s *cmd_ctx)
543 int armv7m_checksum_memory(struct target_s *target, u32 address, u32 count, u32* checksum)
545 working_area_t *crc_algorithm;
546 armv7m_algorithm_t armv7m_info;
547 reg_param_t reg_params[2];
550 u16 cortex_m3_crc_code[] = {
551 0x4602, /* mov r2, r0 */
552 0xF04F, 0x30FF, /* mov r0, #0xffffffff */
553 0x460B, /* mov r3, r1 */
554 0xF04F, 0x0400, /* mov r4, #0 */
555 0xE013, /* b ncomp */
557 0x5D11, /* ldrb r1, [r2, r4] */
558 0xF8DF, 0x7028, /* ldr r7, CRC32XOR */
559 0xEA80, 0x6001, /* eor r0, r0, r1, asl #24 */
561 0xF04F, 0x0500, /* mov r5, #0 */
563 0x2800, /* cmp r0, #0 */
564 0xEA4F, 0x0640, /* mov r6, r0, asl #1 */
565 0xF105, 0x0501, /* add r5, r5, #1 */
566 0x4630, /* mov r0, r6 */
568 0xEA86, 0x0007, /* eor r0, r6, r7 */
569 0x2D08, /* cmp r5, #8 */
570 0xD1F4, /* bne loop */
572 0xF104, 0x0401, /* add r4, r4, #1 */
574 0x429C, /* cmp r4, r3 */
575 0xD1E9, /* bne nbyte */
578 0x1DB7, 0x04C1 /* CRC32XOR: .word 0x04C11DB7 */
583 if (target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm) != ERROR_OK)
585 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
588 /* convert flash writing code into a buffer in target endianness */
589 for (i = 0; i < (sizeof(cortex_m3_crc_code)/sizeof(u16)); i++)
590 if((retval = target_write_u16(target, crc_algorithm->address + i*sizeof(u16), cortex_m3_crc_code[i])) != ERROR_OK)
595 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
596 armv7m_info.core_mode = ARMV7M_MODE_ANY;
598 init_reg_param(®_params[0], "r0", 32, PARAM_IN_OUT);
599 init_reg_param(®_params[1], "r1", 32, PARAM_OUT);
601 buf_set_u32(reg_params[0].value, 0, 32, address);
602 buf_set_u32(reg_params[1].value, 0, 32, count);
604 if ((retval = target->type->run_algorithm(target, 0, NULL, 2, reg_params,
605 crc_algorithm->address, crc_algorithm->address + (sizeof(cortex_m3_crc_code)-6), 20000, &armv7m_info)) != ERROR_OK)
607 LOG_ERROR("error executing cortex_m3 crc algorithm");
608 destroy_reg_param(®_params[0]);
609 destroy_reg_param(®_params[1]);
610 target_free_working_area(target, crc_algorithm);
614 *checksum = buf_get_u32(reg_params[0].value, 0, 32);
616 destroy_reg_param(®_params[0]);
617 destroy_reg_param(®_params[1]);
619 target_free_working_area(target, crc_algorithm);
624 int armv7m_blank_check_memory(struct target_s *target, u32 address, u32 count, u32* blank)
626 working_area_t *erase_check_algorithm;
627 reg_param_t reg_params[3];
628 armv7m_algorithm_t armv7m_info;
632 u16 erase_check_code[] =
635 0xF810, 0x3B01, /* ldrb r3, [r0], #1 */
636 0xEA02, 0x0203, /* and r2, r2, r3 */
637 0x3901, /* subs r1, r1, #1 */
638 0xD1F9, /* bne loop */
643 /* make sure we have a working area */
644 if (target_alloc_working_area(target, sizeof(erase_check_code), &erase_check_algorithm) != ERROR_OK)
646 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
649 /* convert flash writing code into a buffer in target endianness */
650 for (i = 0; i < (sizeof(erase_check_code)/sizeof(u16)); i++)
651 target_write_u16(target, erase_check_algorithm->address + i*sizeof(u16), erase_check_code[i]);
653 armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
654 armv7m_info.core_mode = ARMV7M_MODE_ANY;
656 init_reg_param(®_params[0], "r0", 32, PARAM_OUT);
657 buf_set_u32(reg_params[0].value, 0, 32, address);
659 init_reg_param(®_params[1], "r1", 32, PARAM_OUT);
660 buf_set_u32(reg_params[1].value, 0, 32, count);
662 init_reg_param(®_params[2], "r2", 32, PARAM_IN_OUT);
663 buf_set_u32(reg_params[2].value, 0, 32, 0xff);
665 if ((retval = target->type->run_algorithm(target, 0, NULL, 3, reg_params,
666 erase_check_algorithm->address, erase_check_algorithm->address + (sizeof(erase_check_code)-2), 10000, &armv7m_info)) != ERROR_OK)
668 destroy_reg_param(®_params[0]);
669 destroy_reg_param(®_params[1]);
670 destroy_reg_param(®_params[2]);
671 target_free_working_area(target, erase_check_algorithm);
675 *blank = buf_get_u32(reg_params[2].value, 0, 32);
677 destroy_reg_param(®_params[0]);
678 destroy_reg_param(®_params[1]);
679 destroy_reg_param(®_params[2]);
681 target_free_working_area(target, erase_check_algorithm);