Flash handling for STM32F76x/77x and F446 added 26/3526/5
authorAndreas Bolsch <hyphen0break@gmail.com>
Mon, 20 Jun 2016 19:02:29 +0000 (21:02 +0200)
committerAndreas Fritiofson <andreas.fritiofson@gmail.com>
Sun, 14 Aug 2016 01:00:13 +0000 (02:00 +0100)
- added ids for various parts
- rewrite of sector allocation to deal with dual-bank F76x/77x
- single- / dual-bank mode for F76x/77x
- sector protection adapted for F76x/77x in dual-bank mode
- handling of additional option bits (28-31) in FLASH_OPTCR
  in options_read and options_write for F42x/43x/469/479/7xx,
  options bits 0-1 masked out
- check for sensible value of user_options in options_write

- some #defines clarified, non-needed ones removed

- docs updated (options read, options write)

Change-Id: Ie4db80e60baa7d2663e024ab1f278640b1ce901b
Signed-off-by: Andreas Bolsch <hyphen0break@gmail.com>
Reviewed-on: http://openocd.zylin.com/3526
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
doc/openocd.texi
src/flash/nor/stm32f2x.c

index 983ce3c..dcb843a 100644 (file)
@@ -5827,8 +5827,8 @@ The @var{num} parameter is a value shown by @command{flash banks}.
 @end deffn
 
 @deffn {Flash Driver} stm32f2x
-All members of the STM32F2 and STM32F4 microcontroller families from ST Microelectronics
-include internal flash and use ARM Cortex-M3/M4 cores.
+All members of the STM32F2, STM32F4 and STM32F7 microcontroller families from ST Microelectronics
+include internal flash and use ARM Cortex-M3/M4/M7 cores.
 The driver automatically recognizes a number of these chips using
 the chip identification register, and autoconfigures itself.
 
@@ -5851,6 +5851,19 @@ The @var{num} parameter is a value shown by @command{flash banks}.
 Unlocks the entire stm32 device.
 The @var{num} parameter is a value shown by @command{flash banks}.
 @end deffn
+
+@deffn Command {stm32f2x options_read} num
+Reads and displays user options and (where implemented) boot_addr0 and boot_addr1.
+The @var{num} parameter is a value shown by @command{flash banks}.
+@end deffn
+
+@deffn Command {stm32f2x options_write} num user_options boot_addr0 boot_addr1
+Writes user options and (where implemented) boot_addr0 and boot_addr1 in raw format.
+Warning: The meaning of the various bits depends on the device, always check datasheet!
+The @var{num} parameter is a value shown by @command{flash banks}, user_options a
+12 bit value, consisting of bits 31-28 and 7-0 of FLASH_OPTCR, boot_addr0 and boot_addr1
+two halfwords (of FLASH_OPTCR1).
+@end deffn
 @end deffn
 
 @deffn {Flash Driver} stm32lx
index 4269c44..1acab82 100644 (file)
  * 1 MiByte STM32F42x/43x part with DB1M Option set:
  *                    4 x 16, 1 x 64, 3 x 128, 4 x 16, 1 x 64, 3 x 128.
  *
- * STM32F7
+ * STM32F7[4|5]
  * 1 MiByte part with 4 x 32, 1 x 128, 3 x 256.
  *
+ * STM32F7[6|7]
+ * 1 MiByte part in single bank mode with 4 x 32, 1 x 128, 3 x 256.
+ * 1 MiByte part in dual-bank mode two banks with 4 x 16, 1 x 64, 3 x 128 each.
+ * 2 MiByte part in single-bank mode with 4 x 32, 1 x 128, 7 x 256.
+ * 2 MiByte part in dual-bank mode two banks with 4 x 16, 1 x 64, 7 x 128 each.
+ *
  * Protection size is sector size.
  *
  * Tested with STM3220F-EVAL board.
@@ -84,6 +90,9 @@
  * RM0385
  * http://www.st.com/web/en/resource/technical/document/reference_manual/DM00124865.pdf
  *
+ * RM0410
+ * http://www.st.com/resource/en/reference_manual/dm00224583.pdf
+ *
  * STM32F1x series - notice that this code was copy, pasted and knocked
  * into a stm32f2x driver, so in case something has been converted or
  * bugs haven't been fixed, here are the original manuals:
 #define STM32_FLASH_OPTCR1  0x40023c18
 
 /* FLASH_CR register bits */
-
 #define FLASH_PG       (1 << 0)
 #define FLASH_SER      (1 << 1)
-#define FLASH_MER      (1 << 2)
-#define FLASH_MER1     (1 << 15)
+#define FLASH_MER      (1 << 2)                /* MER/MER1 for f76x/77x */
+#define FLASH_MER1     (1 << 15)       /* MER2 for f76x/77x, confusing ... */
 #define FLASH_STRT     (1 << 16)
 #define FLASH_PSIZE_8  (0 << 8)
 #define FLASH_PSIZE_16 (1 << 8)
 #define FLASH_LOCK     (1 << 31)
 
 /* FLASH_SR register bits */
-
 #define FLASH_BSY      (1 << 16)
 #define FLASH_PGSERR   (1 << 7) /* Programming sequence error */
 #define FLASH_PGPERR   (1 << 6) /* Programming parallelism error */
 #define FLASH_ERROR (FLASH_PGSERR | FLASH_PGPERR | FLASH_PGAERR | FLASH_WRPERR | FLASH_OPERR)
 
 /* STM32_FLASH_OPTCR register bits */
-
-#define OPT_LOCK      (1 << 0)
-#define OPT_START     (1 << 1)
-
-/* STM32_FLASH_OBR bit definitions (reading) */
-
-#define OPT_ERROR      0
-#define OPT_READOUT    1
-#define OPT_RDWDGSW    2
-#define OPT_RDRSTSTOP  3
-#define OPT_RDRSTSTDBY 4
-#define OPT_BFB2       5       /* dual flash bank only */
-#define OPT_DB1M       14      /* 1 MiB devices dual flash bank option */
+#define OPTCR_LOCK     (1 << 0)
+#define OPTCR_START    (1 << 1)
+#define OPTCR_NDBANK   (1 << 29)       /* not dual bank mode */
+#define OPTCR_DB1M     (1 << 30)       /* 1 MiB devices dual flash bank option */
 
 /* register unlock keys */
-
 #define KEY1           0x45670123
 #define KEY2           0xCDEF89AB
 
 
 struct stm32x_options {
        uint8_t RDP;
-       uint8_t user_options;
+       uint16_t user_options;  /* bit 0-7 usual options, bit 8-11 extra options */
        uint32_t protection;
+       uint32_t boot_addr;
 };
 
 struct stm32x_flash_bank {
        struct stm32x_options option_bytes;
        int probed;
-       bool has_large_mem;             /* stm32f42x/stm32f43x family */
+       bool has_large_mem;             /* F42x/43x/469/479/7xx in dual bank mode */
+       bool has_boot_addr;     /* F7xx */
+       bool has_extra_options; /* F42x/43x/469/479/7xx */
        uint32_t user_bank_size;
 };
 
@@ -284,7 +284,7 @@ static int stm32x_unlock_option_reg(struct target *target)
        if (retval != ERROR_OK)
                return retval;
 
-       if ((ctrl & OPT_LOCK) == 0)
+       if ((ctrl & OPTCR_LOCK) == 0)
                return ERROR_OK;
 
        /* unlock option registers */
@@ -300,7 +300,7 @@ static int stm32x_unlock_option_reg(struct target *target)
        if (retval != ERROR_OK)
                return retval;
 
-       if (ctrl & OPT_LOCK) {
+       if (ctrl & OPTCR_LOCK) {
                LOG_ERROR("options not unlocked STM32_FLASH_OPTCR: %" PRIx32, ctrl);
                return ERROR_TARGET_FAILURE;
        }
@@ -321,18 +321,30 @@ static int stm32x_read_options(struct flash_bank *bank)
        if (retval != ERROR_OK)
                return retval;
 
-       stm32x_info->option_bytes.user_options = optiondata & 0xec;
+    /* caution: F2 implements 5 bits (WDG_SW only)
+     * whereas F7 6 bits (IWDG_SW and WWDG_SW) in user_options */
+       stm32x_info->option_bytes.user_options = optiondata & 0xfc;
        stm32x_info->option_bytes.RDP = (optiondata >> 8) & 0xff;
        stm32x_info->option_bytes.protection = (optiondata >> 16) & 0xfff;
 
-       if (stm32x_info->has_large_mem) {
+       if (stm32x_info->has_extra_options) {
+               /* F42x/43x/469/479 and 7xx have up to 4 bits of extra options */
+               stm32x_info->option_bytes.user_options |= (optiondata >> 20) & 0xf00;
+       }
 
+       if (stm32x_info->has_large_mem || stm32x_info->has_boot_addr) {
                retval = target_read_u32(target, STM32_FLASH_OPTCR1, &optiondata);
                if (retval != ERROR_OK)
                        return retval;
 
-               /* append protection bits */
-               stm32x_info->option_bytes.protection |= (optiondata >> 4) & 0x00fff000;
+               /* FLASH_OPTCR1 has quite diffent meanings ... */
+               if (stm32x_info->has_boot_addr) {
+                       /* for F7xx it contains boot0 and boot1 */
+                       stm32x_info->option_bytes.boot_addr = optiondata;
+               } else {
+                       /* for F42x/43x/469/479 it contains 12 additional protection bits */
+                       stm32x_info->option_bytes.protection |= (optiondata >> 4) & 0x00fff000;
+               }
        }
 
        if (stm32x_info->option_bytes.RDP != 0xAA)
@@ -345,7 +357,7 @@ static int stm32x_write_options(struct flash_bank *bank)
 {
        struct stm32x_flash_bank *stm32x_info = NULL;
        struct target *target = bank->target;
-       uint32_t optiondata;
+       uint32_t optiondata, optiondata2;
 
        stm32x_info = bank->driver_priv;
 
@@ -354,26 +366,36 @@ static int stm32x_write_options(struct flash_bank *bank)
                return retval;
 
        /* rebuild option data */
-       optiondata = stm32x_info->option_bytes.user_options;
+       optiondata = stm32x_info->option_bytes.user_options & 0xfc;
        optiondata |= stm32x_info->option_bytes.RDP << 8;
        optiondata |= (stm32x_info->option_bytes.protection & 0x0fff) << 16;
 
-       /* program options */
-       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata);
-       if (retval != ERROR_OK)
-               return retval;
+       if (stm32x_info->has_extra_options) {
+               /* F42x/43x/469/479 and 7xx have up to 4 bits of extra options */
+               optiondata |= (stm32x_info->option_bytes.user_options & 0xf00) << 20;
+       }
 
-       if (stm32x_info->has_large_mem) {
+       if (stm32x_info->has_large_mem || stm32x_info->has_boot_addr) {
+               if (stm32x_info->has_boot_addr) {
+                       /* F7xx uses FLASH_OPTCR1 for boot0 and boot1 ... */
+                       optiondata2 = stm32x_info->option_bytes.boot_addr;
+               } else {
+                       /* F42x/43x/469/479 uses FLASH_OPTCR1 for additional protection bits */
+                       optiondata2 = (stm32x_info->option_bytes.protection & 0x00fff000) << 4;
+               }
 
-               uint32_t optiondata2 = 0;
-               optiondata2 |= (stm32x_info->option_bytes.protection & 0x00fff000) << 4;
                retval = target_write_u32(target, STM32_FLASH_OPTCR1, optiondata2);
                if (retval != ERROR_OK)
                        return retval;
        }
 
+       /* program options */
+       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata);
+       if (retval != ERROR_OK)
+               return retval;
+
        /* start programming cycle */
-       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata | OPT_START);
+       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata | OPTCR_START);
        if (retval != ERROR_OK)
                return retval;
 
@@ -383,7 +405,7 @@ static int stm32x_write_options(struct flash_bank *bank)
                return retval;
 
        /* relock registers */
-       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata | OPT_LOCK);
+       retval = target_write_u32(target, STM32_FLASH_OPTCR, optiondata | OPTCR_LOCK);
        if (retval != ERROR_OK)
                return retval;
 
@@ -401,11 +423,25 @@ static int stm32x_protect_check(struct flash_bank *bank)
                return retval;
        }
 
-       for (int i = 0; i < bank->num_sectors; i++) {
-               if (stm32x_info->option_bytes.protection & (1 << i))
-                       bank->sectors[i].is_protected = 0;
-               else
-                       bank->sectors[i].is_protected = 1;
+       if (stm32x_info->has_boot_addr && stm32x_info->has_large_mem) {
+               /* F76x/77x: bit k protects sectors 2*k and 2*k+1 */
+               for (int i = 0; i < (bank->num_sectors >> 1); i++) {
+                       if (stm32x_info->option_bytes.protection & (1 << i)) {
+                               bank->sectors[i << 1].is_protected = 0;
+                               bank->sectors[(i << 1) + 1].is_protected = 0;
+                       } else {
+                               bank->sectors[i << 1].is_protected = 1;
+                               bank->sectors[(i << 1) + 1].is_protected = 1;
+                       }
+               }
+       } else {
+               /* one protection bit per sector */
+               for (int i = 0; i < bank->num_sectors; i++) {
+                       if (stm32x_info->option_bytes.protection & (1 << i))
+                               bank->sectors[i].is_protected = 0;
+                       else
+                               bank->sectors[i].is_protected = 1;
+               }
        }
 
        return ERROR_OK;
@@ -416,8 +452,7 @@ static int stm32x_erase(struct flash_bank *bank, int first, int last)
        struct target *target = bank->target;
        int i;
 
-       assert(first < bank->num_sectors);
-       assert(last < bank->num_sectors);
+       assert((0 <= first) && (first <= last) && (last < bank->num_sectors));
 
        if (bank->target->state != TARGET_HALTED) {
                LOG_ERROR("Target not halted");
@@ -477,8 +512,18 @@ static int stm32x_protect(struct flash_bank *bank, int set, int first, int last)
                return retval;
        }
 
-       for (int i = first; i <= last; i++) {
+       if (stm32x_info->has_boot_addr && stm32x_info->has_large_mem) {
+               /* F76x/77x: bit k protects sectors 2*k and 2*k+1 */
+               if ((first & 1) != 0 || (last & 1) != 1) {
+                       LOG_ERROR("sector protection must be double sector aligned");
+                       return ERROR_FAIL;
+               } else {
+                       first >>= 1;
+                       last >>= 1;
+               }
+       }
 
+       for (int i = first; i <= last; i++) {
                if (set)
                        stm32x_info->option_bytes.protection &= ~(1 << i);
                else
@@ -719,14 +764,31 @@ static int stm32x_write(struct flash_bank *bank, const uint8_t *buffer,
        return target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK);
 }
 
-static void setup_sector(struct flash_bank *bank, int start, int num, int size)
+static int setup_sector(struct flash_bank *bank, int start, int num, int size)
 {
+
        for (int i = start; i < (start + num) ; i++) {
                assert(i < bank->num_sectors);
                bank->sectors[i].offset = bank->size;
                bank->sectors[i].size = size;
                bank->size += bank->sectors[i].size;
+           LOG_DEBUG("sector %d: %dkBytes", i, size >> 10);
        }
+
+       return start + num;
+}
+
+static void setup_bank(struct flash_bank *bank, int start,
+       uint16_t flash_size_in_kb, uint16_t max_sector_size_in_kb)
+{
+       int remain;
+
+       start = setup_sector(bank, start, 4, (max_sector_size_in_kb / 8) * 1024);
+       start = setup_sector(bank, start, 1, (max_sector_size_in_kb / 2) * 1024);
+
+       /* remaining sectors all of size max_sector_size_in_kb */
+       remain = (flash_size_in_kb / max_sector_size_in_kb) - 1;
+       start = setup_sector(bank, start, remain, max_sector_size_in_kb * 1024);
 }
 
 static int stm32x_get_device_id(struct flash_bank *bank, uint32_t *device_id)
@@ -774,6 +836,8 @@ static int stm32x_probe(struct flash_bank *bank)
 
        stm32x_info->probed = 0;
        stm32x_info->has_large_mem = false;
+       stm32x_info->has_boot_addr = false;
+       stm32x_info->has_extra_options = false;
 
        /* read stm32 device id register */
        int retval = stm32x_get_device_id(bank, &device_id);
@@ -781,33 +845,50 @@ static int stm32x_probe(struct flash_bank *bank)
                return retval;
        LOG_INFO("device id = 0x%08" PRIx32 "", device_id);
 
-       /* set max flash size depending on family */
+       /* set max flash size depending on family, id taken from AN2606 */
        switch (device_id & 0xfff) {
-       case 0x411:
-       case 0x413:
-       case 0x441:
+       case 0x411: /* F20x/21x */
+       case 0x413: /* F40x/41x */
                max_flash_size_in_kb = 1024;
                break;
-       case 0x419:
-       case 0x434:
+
+       case 0x419: /* F42x/43x */
+       case 0x434: /* F469/479 */
+               stm32x_info->has_extra_options = true;
                max_flash_size_in_kb = 2048;
                break;
-       case 0x423:
+
+       case 0x423:     /* F401xB/C */
                max_flash_size_in_kb = 256;
                break;
-       case 0x431:
-       case 0x433:
-       case 0x421:
+
+       case 0x421:     /* F446 */
+       case 0x431: /* F411 */
+       case 0x433: /* F401xD/E */
+       case 0x441: /* F412 */
                max_flash_size_in_kb = 512;
                break;
-       case 0x458:
+
+       case 0x458: /* F410 */
                max_flash_size_in_kb = 128;
                break;
-       case 0x449:
+
+       case 0x449:     /* F74x/75x */
                max_flash_size_in_kb = 1024;
                max_sector_size_in_kb = 256;
                flash_size_reg = 0x1FF0F442;
+               stm32x_info->has_extra_options = true;
+               stm32x_info->has_boot_addr = true;
+               break;
+
+       case 0x451:     /* F76x/77x */
+               max_flash_size_in_kb = 2048;
+               max_sector_size_in_kb = 256;
+               flash_size_reg = 0x1FF0F442;
+               stm32x_info->has_extra_options = true;
+               stm32x_info->has_boot_addr = true;
                break;
+
        default:
                LOG_WARNING("Cannot identify target as a STM32 family.");
                return ERROR_FAIL;
@@ -836,33 +917,48 @@ static int stm32x_probe(struct flash_bank *bank)
        /* did we assign flash size? */
        assert(flash_size_in_kb != 0xffff);
 
-       /* calculate numbers of pages */
-       int num_pages = (flash_size_in_kb / max_sector_size_in_kb) + 4;
-
        /* Devices with > 1024 kiByte always are dual-banked */
        if (flash_size_in_kb > 1024)
                stm32x_info->has_large_mem = true;
 
-       /* F42x/43x 1024 kiByte devices have a dual bank option */
-       if ((device_id & 0xfff) == 0x419 && (flash_size_in_kb == 1024)) {
+       /* F42x/43x/469/479 1024 kiByte devices have a dual bank option */
+       if ((device_id & 0xfff) == 0x419 || (device_id & 0xfff) == 0x434) {
                uint32_t optiondata;
                retval = target_read_u32(target, STM32_FLASH_OPTCR, &optiondata);
                if (retval != ERROR_OK) {
                        LOG_DEBUG("unable to read option bytes");
                        return retval;
                }
-               if (optiondata & (1 << OPT_DB1M)) {
+               if ((flash_size_in_kb > 1024) || (optiondata & OPTCR_DB1M)) {
                        stm32x_info->has_large_mem = true;
-                       LOG_INFO("Dual Bank 1024 kiB STM32F42x/43x found");
+                       LOG_INFO("Dual Bank %d kiB STM32F42x/43x/469/479 found", flash_size_in_kb);
+               } else {
+                       stm32x_info->has_large_mem = false;
+                       LOG_INFO("Single Bank %d kiB STM32F42x/43x/469/479 found", flash_size_in_kb);
                }
        }
 
-       /* check for dual-banked devices */
-       if (stm32x_info->has_large_mem)
-               num_pages += 4;
+       /* F76x/77x devices have a dual bank option */
+       if ((device_id & 0xfff) == 0x451) {
+               uint32_t optiondata;
+               retval = target_read_u32(target, STM32_FLASH_OPTCR, &optiondata);
+               if (retval != ERROR_OK) {
+                       LOG_DEBUG("unable to read option bytes");
+                       return retval;
+               }
+               if (optiondata & OPTCR_NDBANK) {
+                       stm32x_info->has_large_mem = false;
+                       LOG_INFO("Single Bank %d kiB STM32F76x/77x found", flash_size_in_kb);
+               } else {
+                       stm32x_info->has_large_mem = true;
+                       max_sector_size_in_kb >>= 1; /* sector size divided by 2 in dual-bank mode */
+                       LOG_INFO("Dual Bank %d kiB STM32F76x/77x found", flash_size_in_kb);
+               }
+       }
 
-       /* check that calculation result makes sense */
-       assert(num_pages > 0);
+       /* calculate numbers of pages */
+       int num_pages = flash_size_in_kb / max_sector_size_in_kb
+               + (stm32x_info->has_large_mem ? 8 : 4);
 
        if (bank->sectors) {
                free(bank->sectors);
@@ -872,35 +968,25 @@ static int stm32x_probe(struct flash_bank *bank)
        bank->base = base_address;
        bank->num_sectors = num_pages;
        bank->sectors = malloc(sizeof(struct flash_sector) * num_pages);
+       for (i = 0; i < num_pages; i++) {
+               bank->sectors[i].is_erased = -1;
+               bank->sectors[i].is_protected = 0;
+       }
        bank->size = 0;
-
-       /* fixed memory */
-       setup_sector(bank, 0, 4, (max_sector_size_in_kb / 8) * 1024);
-       setup_sector(bank, 4, 1, (max_sector_size_in_kb / 2) * 1024);
+       LOG_DEBUG("allocated %d sectors", num_pages);
 
        if (stm32x_info->has_large_mem) {
-               if (flash_size_in_kb == 1024) {
-                       setup_sector(bank,  5, 3, 128 * 1024);
-                       setup_sector(bank, 12, 4,  16 * 1024);
-                       setup_sector(bank, 16, 1,  64 * 1024);
-                       setup_sector(bank, 17, 3, 128 * 1024);
-               } else {
-                       setup_sector(bank,  5, 7, 128 * 1024);
-                       setup_sector(bank, 12, 4,  16 * 1024);
-                       setup_sector(bank, 16, 1,  64 * 1024);
-                       setup_sector(bank, 17, 7, 128 * 1024);
-               }
+               /* dual-bank */
+               setup_bank(bank, 0, flash_size_in_kb >> 1, max_sector_size_in_kb);
+               setup_bank(bank, num_pages >> 1, flash_size_in_kb >> 1,
+                       max_sector_size_in_kb);
        } else {
-               setup_sector(bank, 4 + 1, MIN(12, num_pages) - 5,
-                                        max_sector_size_in_kb * 1024);
-       }
-       for (i = 0; i < num_pages; i++) {
-               bank->sectors[i].is_erased = -1;
-               bank->sectors[i].is_protected = 0;
+               /* single-bank */
+               setup_bank(bank, 0, flash_size_in_kb, max_sector_size_in_kb);
        }
+       assert((bank->size >> 10) == flash_size_in_kb);
 
        stm32x_info->probed = 1;
-
        return ERROR_OK;
 }
 
@@ -950,11 +1036,24 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size)
                case 0x2003:
                        rev_str = "X";
                        break;
+
+               case 0x2007:
+                       rev_str = "1";
+                       break;
+
+               case 0x200F:
+                       rev_str = "V";
+                       break;
+
+               case 0x201F:
+                       rev_str = "2";
+                       break;
                }
                break;
 
        case 0x413:
        case 0x419:
+       case 0x434:
                device_str = "STM32F4xx";
 
                switch (rev_id) {
@@ -979,6 +1078,7 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size)
                        break;
                }
                break;
+
        case 0x421:
                device_str = "STM32F446";
 
@@ -988,6 +1088,7 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size)
                        break;
                }
                break;
+
        case 0x423:
        case 0x431:
        case 0x433:
@@ -1019,8 +1120,9 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size)
                        break;
                }
                break;
-       case 0x434:
-               device_str = "STM32F46x/F47x";
+
+       case 0x451:
+               device_str = "STM32F7[6|7]x";
 
                switch (rev_id) {
                case 0x1000:
@@ -1146,6 +1248,7 @@ static int stm32x_mass_erase(struct flash_bank *bank)
                flash_mer = FLASH_MER | FLASH_MER1;
        else
                flash_mer = FLASH_MER;
+
        retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), flash_mer);
        if (retval != ERROR_OK)
                return retval;
@@ -1193,6 +1296,107 @@ COMMAND_HANDLER(stm32x_handle_mass_erase_command)
        return retval;
 }
 
+COMMAND_HANDLER(stm32f2x_handle_options_read_command)
+{
+       int retval;
+       struct flash_bank *bank;
+       struct stm32x_flash_bank *stm32x_info = NULL;
+
+       if (CMD_ARGC != 1) {
+               command_print(CMD_CTX, "stm32f2x options_read <bank>");
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
+       if (ERROR_OK != retval)
+               return retval;
+
+       retval = stm32x_read_options(bank);
+       if (ERROR_OK != retval)
+               return retval;
+
+       stm32x_info = bank->driver_priv;
+       if (stm32x_info->has_extra_options) {
+               if (stm32x_info->has_boot_addr) {
+                       uint32_t boot_addr = stm32x_info->option_bytes.boot_addr;
+
+                       command_print(CMD_CTX, "stm32f2x user_options 0x%03X,"
+                               " boot_add0 0x%04X, boot_add1 0x%04X",
+                               stm32x_info->option_bytes.user_options,
+                               boot_addr & 0xffff, (boot_addr & 0xffff0000) >> 16);
+               } else {
+                       command_print(CMD_CTX, "stm32f2x user_options 0x%03X,",
+                               stm32x_info->option_bytes.user_options);
+               }
+       } else {
+               command_print(CMD_CTX, "stm32f2x user_options 0x%02X",
+                       stm32x_info->option_bytes.user_options);
+
+       }
+
+       return retval;
+}
+
+COMMAND_HANDLER(stm32f2x_handle_options_write_command)
+{
+       int retval;
+       struct flash_bank *bank;
+       struct stm32x_flash_bank *stm32x_info = NULL;
+       uint16_t user_options, boot_addr0, boot_addr1;
+
+       if (CMD_ARGC < 1) {
+               command_print(CMD_CTX, "stm32f2x options_write <bank> ...");
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
+       if (ERROR_OK != retval)
+               return retval;
+
+       retval = stm32x_read_options(bank);
+       if (ERROR_OK != retval)
+               return retval;
+
+       stm32x_info = bank->driver_priv;
+       if (stm32x_info->has_boot_addr) {
+               if (CMD_ARGC != 4) {
+                       command_print(CMD_CTX, "stm32f2x options_write <bank> <user_options>"
+                               " <boot_addr0> <boot_addr1>");
+                       return ERROR_COMMAND_SYNTAX_ERROR;
+               }
+               COMMAND_PARSE_NUMBER(u16, CMD_ARGV[2], boot_addr0);
+               COMMAND_PARSE_NUMBER(u16, CMD_ARGV[3], boot_addr1);
+               stm32x_info->option_bytes.boot_addr = boot_addr0 | (((uint32_t) boot_addr1) << 16);
+       } else {
+               if (CMD_ARGC != 2) {
+                       command_print(CMD_CTX, "stm32f2x options_write <bank> <user_options>");
+                       return ERROR_COMMAND_SYNTAX_ERROR;
+               }
+       }
+
+       COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], user_options);
+       if (user_options & (stm32x_info->has_extra_options ? ~0xffc : ~0xfc)) {
+               command_print(CMD_CTX, "stm32f2x invalid user_options");
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       stm32x_info->option_bytes.user_options = user_options;
+
+       if (stm32x_write_options(bank) != ERROR_OK) {
+               command_print(CMD_CTX, "stm32f2x failed to write options");
+               return ERROR_OK;
+       }
+
+       /* switching between single- and dual-bank modes requires re-probe */
+       /* ... and reprogramming of whole flash */
+       stm32x_info->probed = 0;
+
+       command_print(CMD_CTX, "stm32f2x write options complete.\n"
+                               "INFO: a reset or power cycle is required "
+                               "for the new settings to take effect.");
+       return retval;
+}
+
 static const struct command_registration stm32x_exec_command_handlers[] = {
        {
                .name = "lock",
@@ -1215,6 +1419,20 @@ static const struct command_registration stm32x_exec_command_handlers[] = {
                .usage = "bank_id",
                .help = "Erase entire flash device.",
        },
+       {
+               .name = "options_read",
+               .handler = stm32f2x_handle_options_read_command,
+               .mode = COMMAND_EXEC,
+               .usage = "bank_id",
+               .help = "Read and display device option bytes.",
+       },
+       {
+               .name = "options_write",
+               .handler = stm32f2x_handle_options_write_command,
+               .mode = COMMAND_EXEC,
+               .usage = "bank_id user_options [ boot_add0 boot_add1]",
+               .help = "Write option bytes",
+       },
        COMMAND_REGISTRATION_DONE
 };