1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
8 * Copyright (C) 2011 by Clement Burin des Roziers *
9 * clement.burin-des-roziers@hikob.com *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
32 #include <helper/binarybuffer.h>
33 #include <target/algorithm.h>
34 #include <target/armv7m.h>
36 /* stm32lx flash register locations */
38 #define FLASH_BASE 0x40023C00
39 #define FLASH_ACR 0x40023C00
40 #define FLASH_PECR 0x40023C04
41 #define FLASH_PDKEYR 0x40023C08
42 #define FLASH_PEKEYR 0x40023C0C
43 #define FLASH_PRGKEYR 0x40023C10
44 #define FLASH_OPTKEYR 0x40023C14
45 #define FLASH_SR 0x40023C18
46 #define FLASH_OBR 0x40023C1C
47 #define FLASH_WRPR 0x40023C20
50 #define FLASH_ACR__LATENCY (1<<0)
51 #define FLASH_ACR__PRFTEN (1<<1)
52 #define FLASH_ACR__ACC64 (1<<2)
53 #define FLASH_ACR__SLEEP_PD (1<<3)
54 #define FLASH_ACR__RUN_PD (1<<4)
57 #define FLASH_PECR__PELOCK (1<<0)
58 #define FLASH_PECR__PRGLOCK (1<<1)
59 #define FLASH_PECR__OPTLOCK (1<<2)
60 #define FLASH_PECR__PROG (1<<3)
61 #define FLASH_PECR__DATA (1<<4)
62 #define FLASH_PECR__FTDW (1<<8)
63 #define FLASH_PECR__ERASE (1<<9)
64 #define FLASH_PECR__FPRG (1<<10)
65 #define FLASH_PECR__EOPIE (1<<16)
66 #define FLASH_PECR__ERRIE (1<<17)
67 #define FLASH_PECR__OBL_LAUNCH (1<<18)
70 #define FLASH_SR__BSY (1<<0)
71 #define FLASH_SR__EOP (1<<1)
72 #define FLASH_SR__ENDHV (1<<2)
73 #define FLASH_SR__READY (1<<3)
74 #define FLASH_SR__WRPERR (1<<8)
75 #define FLASH_SR__PGAERR (1<<9)
76 #define FLASH_SR__SIZERR (1<<10)
77 #define FLASH_SR__OPTVERR (1<<11)
80 #define PEKEY1 0x89ABCDEF
81 #define PEKEY2 0x02030405
82 #define PRGKEY1 0x8C9DAEBF
83 #define PRGKEY2 0x13141516
84 #define OPTKEY1 0xFBEAD9C8
85 #define OPTKEY2 0x24252627
88 #define DBGMCU_IDCODE 0xE0042000
89 #define F_SIZE 0x1FF8004C
92 #define FLASH_PAGE_SIZE 256
93 #define FLASH_SECTOR_SIZE 4096
94 #define FLASH_PAGES_PER_SECTOR 16
95 #define FLASH_BANK0_ADDRESS 0x08000000
97 /* stm32lx option byte register location */
98 #define OB_RDP 0x1FF80000
99 #define OB_USER 0x1FF80004
100 #define OB_WRP0_1 0x1FF80008
101 #define OB_WRP2_3 0x1FF8000C
104 #define OB_RDP__LEVEL0 0xFF5500AA
105 #define OB_RDP__LEVEL1 0xFFFF0000
107 /* stm32lx RCC register locations */
108 #define RCC_CR 0x40023800
109 #define RCC_ICSCR 0x40023804
110 #define RCC_CFGR 0x40023808
113 #define RCC_ICSCR__MSIRANGE_MASK (7<<13)
115 static int stm32lx_unlock_program_memory(struct flash_bank
*bank
);
116 static int stm32lx_lock_program_memory(struct flash_bank
*bank
);
117 static int stm32lx_enable_write_half_page(struct flash_bank
*bank
);
118 static int stm32lx_erase_sector(struct flash_bank
*bank
, int sector
);
119 static int stm32lx_wait_until_bsy_clear(struct flash_bank
*bank
);
121 struct stm32lx_flash_bank
{
122 struct working_area
*write_algorithm
;
126 /* flash bank stm32lx <base> <size> 0 0 <target#>
128 FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command
)
130 struct stm32lx_flash_bank
*stm32lx_info
;
132 return ERROR_COMMAND_SYNTAX_ERROR
;
134 /* Create the bank structure */
135 stm32lx_info
= malloc(sizeof(struct stm32lx_flash_bank
));
137 /* Check allocation */
138 if (stm32lx_info
== NULL
) {
139 LOG_ERROR("failed to allocate bank structure");
143 bank
->driver_priv
= stm32lx_info
;
145 stm32lx_info
->write_algorithm
= NULL
;
146 stm32lx_info
->probed
= 0;
151 static int stm32lx_protect_check(struct flash_bank
*bank
)
154 struct target
*target
= bank
->target
;
158 if (target
->state
!= TARGET_HALTED
) {
159 LOG_ERROR("Target not halted");
160 return ERROR_TARGET_NOT_HALTED
;
164 * Read the WRPR word, and check each bit (corresponding to each
167 retval
= target_read_u32(target
, FLASH_WRPR
, &wrpr
);
168 if (retval
!= ERROR_OK
)
171 for (int i
= 0; i
< 32; i
++) {
173 bank
->sectors
[i
].is_protected
= 1;
175 bank
->sectors
[i
].is_protected
= 0;
180 static int stm32lx_erase(struct flash_bank
*bank
, int first
, int last
)
185 * It could be possible to do a mass erase if all sectors must be
186 * erased, but it is not implemented yet.
189 if (bank
->target
->state
!= TARGET_HALTED
) {
190 LOG_ERROR("Target not halted");
191 return ERROR_TARGET_NOT_HALTED
;
195 * Loop over the selected sectors and erase them
197 for (int i
= first
; i
<= last
; i
++) {
198 retval
= stm32lx_erase_sector(bank
, i
);
199 if (retval
!= ERROR_OK
)
201 bank
->sectors
[i
].is_erased
= 1;
206 static int stm32lx_protect(struct flash_bank
*bank
, int set
, int first
,
209 LOG_WARNING("protection of the STM32L flash is not implemented");
213 static int stm32lx_write_half_pages(struct flash_bank
*bank
, uint8_t *buffer
,
214 uint32_t offset
, uint32_t count
)
216 struct stm32lx_flash_bank
*stm32lx_info
= bank
->driver_priv
;
217 struct target
*target
= bank
->target
;
218 uint32_t buffer_size
= 4096 * 4;
219 struct working_area
*source
;
220 uint32_t address
= bank
->base
+ offset
;
222 struct reg_param reg_params
[5];
223 struct armv7m_algorithm armv7m_info
;
225 int retval
= ERROR_OK
;
228 /* see contib/loaders/flash/stm32lx.s for src */
230 static const uint16_t stm32lx_flash_write_code_16
[] = {
231 /* 00000000 <write_word-0x4>: */
232 0x2300, /* 0: 2300 movs r3, #0 */
233 0xe004, /* 2: e004 b.n e <test_done> */
235 /* 00000004 <write_word>: */
236 0xf851, 0xcb04, /* 4: f851 cb04 ldr.w ip, [r1], #4 */
237 0xf840, 0xcb04, /* 8: f840 cb04 str.w ip, [r0], #4 */
238 0x3301, /* c: 3301 adds r3, #1 */
240 /* 0000000e <test_done>: */
241 0x4293, /* e: 4293 cmp r3, r2 */
242 0xd3f8, /* 10: d3f8 bcc.n 4 <write_word> */
243 0xbe00, /* 12: be00 bkpt 0x0000 */
248 uint8_t stm32lx_flash_write_code
[sizeof(stm32lx_flash_write_code_16
)];
249 for (unsigned int i
= 0; i
< sizeof(stm32lx_flash_write_code_16
) / 2; i
++) {
250 stm32lx_flash_write_code
[i
* 2 + 0] = stm32lx_flash_write_code_16
[i
]
252 stm32lx_flash_write_code
[i
* 2 + 1] = (stm32lx_flash_write_code_16
[i
]
255 /* Check if there is an even number of half pages (128bytes) */
257 LOG_ERROR("there should be an even number "
258 "of half pages = 128 bytes (count = %" PRIi32
" bytes)", count
);
262 /* Allocate working area */
263 reg32
= sizeof(stm32lx_flash_write_code
);
264 /* Add bytes to make 4byte aligned */
265 reg32
+= (4 - (reg32
% 4)) % 4;
266 retval
= target_alloc_working_area(target
, reg32
,
267 &stm32lx_info
->write_algorithm
);
268 if (retval
!= ERROR_OK
)
271 /* Write the flashing code */
272 retval
= target_write_buffer(target
,
273 stm32lx_info
->write_algorithm
->address
,
274 sizeof(stm32lx_flash_write_code
),
275 (uint8_t *)stm32lx_flash_write_code
);
276 if (retval
!= ERROR_OK
) {
277 target_free_working_area(target
, stm32lx_info
->write_algorithm
);
281 /* Allocate half pages memory */
282 while (target_alloc_working_area_try(target
, buffer_size
, &source
)
284 if (buffer_size
> 1024)
289 if (buffer_size
<= 256) {
290 /* if we already allocated the writing code, but failed to get a
291 * buffer, free the algorithm */
292 if (stm32lx_info
->write_algorithm
)
293 target_free_working_area(target
, stm32lx_info
->write_algorithm
);
295 LOG_WARNING("no large enough working area available, can't do block memory writes");
296 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
299 LOG_DEBUG("allocated working area for data (%" PRIx32
" bytes)", buffer_size
);
301 armv7m_info
.common_magic
= ARMV7M_COMMON_MAGIC
;
302 armv7m_info
.core_mode
= ARMV7M_MODE_ANY
;
303 init_reg_param(®_params
[0], "r0", 32, PARAM_OUT
);
304 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
305 init_reg_param(®_params
[2], "r2", 32, PARAM_OUT
);
306 init_reg_param(®_params
[3], "r3", 32, PARAM_IN_OUT
);
307 init_reg_param(®_params
[4], "r4", 32, PARAM_OUT
);
309 /* Enable half-page write */
310 retval
= stm32lx_enable_write_half_page(bank
);
311 if (retval
!= ERROR_OK
) {
312 target_free_working_area(target
, source
);
313 target_free_working_area(target
, stm32lx_info
->write_algorithm
);
315 destroy_reg_param(®_params
[0]);
316 destroy_reg_param(®_params
[1]);
317 destroy_reg_param(®_params
[2]);
318 destroy_reg_param(®_params
[3]);
322 /* Loop while there are bytes to write */
325 this_count
= (count
> buffer_size
) ? buffer_size
: count
;
327 /* Write the next half pages */
328 retval
= target_write_buffer(target
, source
->address
, this_count
,
330 if (retval
!= ERROR_OK
)
333 /* 4: Store useful information in the registers */
334 /* the destination address of the copy (R0) */
335 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
336 /* The source address of the copy (R1) */
337 buf_set_u32(reg_params
[1].value
, 0, 32, source
->address
);
338 /* The length of the copy (R2) */
339 buf_set_u32(reg_params
[2].value
, 0, 32, this_count
/ 4);
341 /* 5: Execute the bunch of code */
342 retval
= target_run_algorithm(target
, 0, NULL
, sizeof(reg_params
)
343 / sizeof(*reg_params
), reg_params
,
344 stm32lx_info
->write_algorithm
->address
, 0, 20000, &armv7m_info
);
345 if (retval
!= ERROR_OK
)
348 /* 6: Wait while busy */
349 retval
= stm32lx_wait_until_bsy_clear(bank
);
350 if (retval
!= ERROR_OK
)
353 buffer
+= this_count
;
354 address
+= this_count
;
358 if (retval
== ERROR_OK
)
359 retval
= stm32lx_lock_program_memory(bank
);
361 target_free_working_area(target
, source
);
362 target_free_working_area(target
, stm32lx_info
->write_algorithm
);
364 destroy_reg_param(®_params
[0]);
365 destroy_reg_param(®_params
[1]);
366 destroy_reg_param(®_params
[2]);
367 destroy_reg_param(®_params
[3]);
371 static int stm32lx_write(struct flash_bank
*bank
, uint8_t *buffer
,
372 uint32_t offset
, uint32_t count
)
374 struct target
*target
= bank
->target
;
376 uint32_t halfpages_number
;
377 uint32_t words_remaining
;
378 uint32_t bytes_remaining
;
379 uint32_t address
= bank
->base
+ offset
;
380 uint32_t bytes_written
= 0;
383 if (bank
->target
->state
!= TARGET_HALTED
) {
384 LOG_ERROR("Target not halted");
385 return ERROR_TARGET_NOT_HALTED
;
389 LOG_ERROR("offset 0x%" PRIx32
" breaks required 2-byte alignment", offset
);
390 return ERROR_FLASH_DST_BREAKS_ALIGNMENT
;
393 /* Check if there are some full half pages */
394 if (((offset
% 128) == 0) && (count
>= 128)) {
395 halfpages_number
= count
/ 128;
396 words_remaining
= (count
- 128 * halfpages_number
) / 4;
397 bytes_remaining
= (count
& 0x3);
399 halfpages_number
= 0;
400 words_remaining
= (count
/ 4);
401 bytes_remaining
= (count
& 0x3);
404 if (halfpages_number
) {
405 retval
= stm32lx_write_half_pages(bank
, buffer
, offset
, 128
407 if (retval
!= ERROR_OK
)
411 bytes_written
= 128 * halfpages_number
;
413 retval
= stm32lx_unlock_program_memory(bank
);
414 if (retval
!= ERROR_OK
)
417 while (words_remaining
> 0) {
419 uint8_t *p
= buffer
+ bytes_written
;
421 /* Prepare the word, Little endian conversion */
422 value
= p
[0] + (p
[1] << 8) + (p
[2] << 16) + (p
[3] << 24);
424 retval
= target_write_u32(target
, address
, value
);
425 if (retval
!= ERROR_OK
)
432 retval
= stm32lx_wait_until_bsy_clear(bank
);
433 if (retval
!= ERROR_OK
)
437 if (bytes_remaining
) {
438 uint8_t last_word
[4] = {0xff, 0xff, 0xff, 0xff};
440 /* copy the last remaining bytes into the write buffer */
441 memcpy(last_word
, buffer
+bytes_written
, bytes_remaining
);
443 retval
= target_write_buffer(target
, address
, 4, last_word
);
444 if (retval
!= ERROR_OK
)
447 retval
= stm32lx_wait_until_bsy_clear(bank
);
448 if (retval
!= ERROR_OK
)
452 retval
= stm32lx_lock_program_memory(bank
);
453 if (retval
!= ERROR_OK
)
459 static int stm32lx_probe(struct flash_bank
*bank
)
461 struct target
*target
= bank
->target
;
462 struct stm32lx_flash_bank
*stm32lx_info
= bank
->driver_priv
;
467 stm32lx_info
->probed
= 0;
469 /* read stm32 device id register */
470 int retval
= target_read_u32(target
, DBGMCU_IDCODE
, &device_id
);
471 if (retval
!= ERROR_OK
)
474 LOG_DEBUG("device id = 0x%08" PRIx32
"", device_id
);
476 if ((device_id
& 0xfff) != 0x416) {
477 LOG_WARNING("Cannot identify target as a STM32L family.");
481 /* get flash size from target. */
482 retval
= target_read_u16(target
, F_SIZE
, &flash_size
);
483 if (retval
!= ERROR_OK
)
486 /* check for valid flash size */
487 if (flash_size
== 0xffff) {
488 /* number of sectors incorrect on revA */
489 LOG_ERROR("STM32 flash size failed, probe inaccurate");
493 /* STM32L - we have 32 sectors, 16 pages per sector -> 512 pages
494 * 16 pages for a protection area */
496 /* calculate numbers of sectors (4kB per sector) */
497 int num_sectors
= (flash_size
* 1024) / FLASH_SECTOR_SIZE
;
498 LOG_INFO("flash size = %dkbytes", flash_size
);
502 bank
->sectors
= NULL
;
505 bank
->base
= FLASH_BANK0_ADDRESS
;
506 bank
->size
= flash_size
* 1024;
507 bank
->num_sectors
= num_sectors
;
508 bank
->sectors
= malloc(sizeof(struct flash_sector
) * num_sectors
);
509 if (bank
->sectors
== NULL
) {
510 LOG_ERROR("failed to allocate bank sectors");
514 for (i
= 0; i
< num_sectors
; i
++) {
515 bank
->sectors
[i
].offset
= i
* FLASH_SECTOR_SIZE
;
516 bank
->sectors
[i
].size
= FLASH_SECTOR_SIZE
;
517 bank
->sectors
[i
].is_erased
= -1;
518 bank
->sectors
[i
].is_protected
= 1;
521 stm32lx_info
->probed
= 1;
526 static int stm32lx_auto_probe(struct flash_bank
*bank
)
528 struct stm32lx_flash_bank
*stm32lx_info
= bank
->driver_priv
;
530 if (stm32lx_info
->probed
)
533 return stm32lx_probe(bank
);
536 static int stm32lx_erase_check(struct flash_bank
*bank
)
538 struct target
*target
= bank
->target
;
539 const int buffer_size
= 4096;
542 int retval
= ERROR_OK
;
544 if (bank
->target
->state
!= TARGET_HALTED
) {
545 LOG_ERROR("Target not halted");
546 return ERROR_TARGET_NOT_HALTED
;
549 uint8_t *buffer
= malloc(buffer_size
);
550 if (buffer
== NULL
) {
551 LOG_ERROR("failed to allocate read buffer");
555 for (i
= 0; i
< bank
->num_sectors
; i
++) {
557 bank
->sectors
[i
].is_erased
= 1;
559 /* Loop chunk by chunk over the sector */
560 for (j
= 0; j
< bank
->sectors
[i
].size
; j
+= buffer_size
) {
563 if (chunk
> (j
- bank
->sectors
[i
].size
))
564 chunk
= (j
- bank
->sectors
[i
].size
);
566 retval
= target_read_memory(target
, bank
->base
567 + bank
->sectors
[i
].offset
+ j
, 4, chunk
/ 4, buffer
);
568 if (retval
!= ERROR_OK
)
571 for (nBytes
= 0; nBytes
< chunk
; nBytes
++) {
572 if (buffer
[nBytes
] != 0x00) {
573 bank
->sectors
[i
].is_erased
= 0;
578 if (retval
!= ERROR_OK
)
586 static int stm32lx_get_info(struct flash_bank
*bank
, char *buf
, int buf_size
)
588 /* This method must return a string displaying information about the bank */
590 struct target
*target
= bank
->target
;
594 /* read stm32 device id register */
595 int retval
= target_read_u32(target
, DBGMCU_IDCODE
, &device_id
);
596 if (retval
!= ERROR_OK
)
599 if ((device_id
& 0xfff) == 0x416) {
600 printed
= snprintf(buf
, buf_size
, "stm32lx - Rev: ");
604 switch (device_id
>> 16) {
606 snprintf(buf
, buf_size
, "A");
610 snprintf(buf
, buf_size
, "Y");
613 snprintf(buf
, buf_size
, "unknown");
617 snprintf(buf
, buf_size
, "Cannot identify target as a stm32lx");
624 static const struct command_registration stm32lx_exec_command_handlers
[] = {
625 COMMAND_REGISTRATION_DONE
628 static const struct command_registration stm32lx_command_handlers
[] = {
632 .help
= "stm32lx flash command group",
634 .chain
= stm32lx_exec_command_handlers
,
636 COMMAND_REGISTRATION_DONE
639 struct flash_driver stm32lx_flash
= {
641 .commands
= stm32lx_command_handlers
,
642 .flash_bank_command
= stm32lx_flash_bank_command
,
643 .erase
= stm32lx_erase
,
644 .protect
= stm32lx_protect
,
645 .write
= stm32lx_write
,
646 .read
= default_flash_read
,
647 .probe
= stm32lx_probe
,
648 .auto_probe
= stm32lx_auto_probe
,
649 .erase_check
= stm32lx_erase_check
,
650 .protect_check
= stm32lx_protect_check
,
651 .info
= stm32lx_get_info
,
654 /* Static methods implementation */
655 static int stm32lx_unlock_program_memory(struct flash_bank
*bank
)
657 struct target
*target
= bank
->target
;
662 * Unlocking the program memory is done by unlocking the PECR,
663 * then by writing the 2 PRGKEY to the PRGKEYR register
666 /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
667 retval
= target_write_u32(target
, FLASH_PEKEYR
, PEKEY1
);
668 if (retval
!= ERROR_OK
)
671 retval
= target_write_u32(target
, FLASH_PEKEYR
, PEKEY2
);
672 if (retval
!= ERROR_OK
)
675 /* Make sure it worked */
676 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
677 if (retval
!= ERROR_OK
)
680 if (reg32
& FLASH_PECR__PELOCK
) {
681 LOG_ERROR("PELOCK is not cleared :(");
682 return ERROR_FLASH_OPERATION_FAILED
;
685 retval
= target_write_u32(target
, FLASH_PRGKEYR
, PRGKEY1
);
686 if (retval
!= ERROR_OK
)
688 retval
= target_write_u32(target
, FLASH_PRGKEYR
, PRGKEY2
);
689 if (retval
!= ERROR_OK
)
692 /* Make sure it worked */
693 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
694 if (retval
!= ERROR_OK
)
697 if (reg32
& FLASH_PECR__PRGLOCK
) {
698 LOG_ERROR("PRGLOCK is not cleared :(");
699 return ERROR_FLASH_OPERATION_FAILED
;
704 static int stm32lx_enable_write_half_page(struct flash_bank
*bank
)
706 struct target
*target
= bank
->target
;
711 * Unlock the program memory, then set the FPRG bit in the PECR register.
713 retval
= stm32lx_unlock_program_memory(bank
);
714 if (retval
!= ERROR_OK
)
717 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
718 if (retval
!= ERROR_OK
)
721 reg32
|= FLASH_PECR__FPRG
;
722 retval
= target_write_u32(target
, FLASH_PECR
, reg32
);
723 if (retval
!= ERROR_OK
)
726 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
727 if (retval
!= ERROR_OK
)
730 reg32
|= FLASH_PECR__PROG
;
731 retval
= target_write_u32(target
, FLASH_PECR
, reg32
);
736 static int stm32lx_lock_program_memory(struct flash_bank
*bank
)
738 struct target
*target
= bank
->target
;
742 /* To lock the program memory, simply set the lock bit and lock PECR */
744 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
745 if (retval
!= ERROR_OK
)
748 reg32
|= FLASH_PECR__PRGLOCK
;
749 retval
= target_write_u32(target
, FLASH_PECR
, reg32
);
750 if (retval
!= ERROR_OK
)
753 retval
= target_read_u32(target
, FLASH_PECR
, ®32
);
754 if (retval
!= ERROR_OK
)
757 reg32
|= FLASH_PECR__PELOCK
;
758 retval
= target_write_u32(target
, FLASH_PECR
, reg32
);
759 if (retval
!= ERROR_OK
)
765 static int stm32lx_erase_sector(struct flash_bank
*bank
, int sector
)
767 struct target
*target
= bank
->target
;
772 * To erase a sector (i.e. FLASH_PAGES_PER_SECTOR pages),
773 * first unlock the memory, loop over the pages of this sector
774 * and write 0x0 to its first word.
777 retval
= stm32lx_unlock_program_memory(bank
);
778 if (retval
!= ERROR_OK
)
781 for (int page
= 0; page
< FLASH_PAGES_PER_SECTOR
; page
++) {
782 reg32
= FLASH_PECR__PROG
| FLASH_PECR__ERASE
;
783 retval
= target_write_u32(target
, FLASH_PECR
, reg32
);
784 if (retval
!= ERROR_OK
)
787 retval
= stm32lx_wait_until_bsy_clear(bank
);
788 if (retval
!= ERROR_OK
)
791 uint32_t addr
= bank
->base
+ bank
->sectors
[sector
].offset
+ (page
793 retval
= target_write_u32(target
, addr
, 0x0);
794 if (retval
!= ERROR_OK
)
797 retval
= stm32lx_wait_until_bsy_clear(bank
);
798 if (retval
!= ERROR_OK
)
802 retval
= stm32lx_lock_program_memory(bank
);
803 if (retval
!= ERROR_OK
)
809 static int stm32lx_wait_until_bsy_clear(struct flash_bank
*bank
)
811 struct target
*target
= bank
->target
;
813 int retval
= ERROR_OK
;
816 /* wait for busy to clear */
818 retval
= target_read_u32(target
, FLASH_SR
, &status
);
819 if (retval
!= ERROR_OK
)
822 if ((status
& FLASH_SR__BSY
) == 0)
824 if (timeout
-- <= 0) {
825 LOG_ERROR("timed out waiting for flash");
831 if (status
& FLASH_SR__WRPERR
) {
832 LOG_ERROR("access denied / write protected");
836 if (status
& FLASH_SR__PGAERR
) {
837 LOG_ERROR("invalid program address");
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