Added Read/Write command for Option-Bytes on STM32F2 series

include/stlink.h

@@ -200,6 +200,7 @@ typedef struct flash_loader {
     int stlink_mwrite_flash(stlink_t *sl, uint8_t* data, uint32_t length, stm32_addr_t addr);
     int stlink_fwrite_flash(stlink_t *sl, const char* path, stm32_addr_t addr);
     int stlink_fwrite_option_bytes(stlink_t *sl, const char* path, stm32_addr_t addr);
+    int stlink_fwrite_option_bytes_32bit(stlink_t *sl,uint32_t val);
     int stlink_mwrite_sram(stlink_t *sl, uint8_t* data, uint32_t length, stm32_addr_t addr);
     int stlink_fwrite_sram(stlink_t *sl, const char* path, stm32_addr_t addr);
     int stlink_verify_write_flash(stlink_t *sl, stm32_addr_t address, uint8_t *data, uint32_t length);
@@ -221,6 +222,7 @@ typedef struct flash_loader {
     int write_loader_to_sram(stlink_t *sl, stm32_addr_t* addr, size_t* size);
     int stlink_fread(stlink_t* sl, const char* path, bool is_ihex, stm32_addr_t addr, size_t size);
     int stlink_load_device_params(stlink_t *sl);
+    int stlink_read_option_bytes_f2(stlink_t *sl, uint32_t* option_byte);
 
 #include "stlink/sg.h"
 #include "stlink/usb.h"

include/stlink/tools/flash.h

@@ -9,6 +9,7 @@
 
 enum flash_cmd {FLASH_CMD_NONE = 0, FLASH_CMD_WRITE = 1, FLASH_CMD_READ = 2, FLASH_CMD_ERASE = 3, CMD_RESET = 4};
 enum flash_format {FLASH_FORMAT_BINARY = 0, FLASH_FORMAT_IHEX = 1};
+enum flash_area {FLASH_MAIN_MEMORY = 0, FLASH_SYSTEM_MEMORY = 1,FLASH_OTP = 2, FLASH_OPTION_BYTES = 3};
 struct flash_opts
 {
     enum flash_cmd cmd;
@@ -20,10 +21,12 @@ struct flash_opts
     int reset;
     int log_level;
     enum flash_format format;
+    enum flash_area area;
+    uint32_t val;
     size_t flash_size;	/* --flash=n[k][m] */
 };
 
-#define FLASH_OPTS_INITIALIZER {0, NULL, { 0 }, NULL, 0, 0, 0, 0, 0, 0 }
+#define FLASH_OPTS_INITIALIZER {0, NULL, { 0 }, NULL, 0, 0, 0, 0, 0, 0, 0, 0 }
 
 int flash_get_opts(struct flash_opts* o, int ac, char** av);
 

include/stm32.h

@@ -16,5 +16,5 @@
 #define STM32_SRAM_BASE            ((uint32_t)0x20000000)
 #define STM32_G0_OPTION_BYTES_BASE ((uint32_t)0x1FFF7800)
 #define STM32_L0_CAT2_OPTION_BYTES_BASE ((uint32_t)0x1FF80000)
-
+#define STM32_F2_OPTION_BYTES_BASE ((uint32_t)0x1FFFC000)
 #endif /* STM32_H */

src/common.c

@@ -194,6 +194,23 @@
 #define FLASH_F4_CR_SNB_MASK 0xf8
 #define FLASH_F4_SR_BSY 16
 
+//STM32F2
+#define FLASH_F2_REGS_ADDR ((uint32_t)0x40023c00)
+#define FLASH_F2_KEYR (FLASH_F2_REGS_ADDR + 0x04)
+#define FLASH_F2_OPT_KEYR (FLASH_F2_REGS_ADDR + 0x08)
+#define FLASH_F2_SR (FLASH_F2_REGS_ADDR + 0x0c)
+#define FLASH_F2_CR (FLASH_F2_REGS_ADDR + 0x10)
+#define FLASH_F2_OPT_CR (FLASH_F2_REGS_ADDR + 0x14)
+#define FLASH_F2_OPT_LOCK_BIT (1u << 0)
+#define FLASH_F2_CR_STRT 16
+#define FLASH_F2_CR_LOCK 31
+
+#define FLASH_F2_CR_SER 1
+#define FLASH_F2_CR_SNB 3
+#define FLASH_F2_CR_SNB_MASK 0x78
+#define FLASH_F2_SR_BSY 16
+
+
 #define L1_WRITE_BLOCK_SIZE 0x80
 #define L0_WRITE_BLOCK_SIZE 0x40
 
@@ -2642,6 +2659,89 @@ static int stlink_write_option_bytes_l0_cat2(stlink_t *sl, uint8_t* base, uint32
     return 0;
 }
 
+/**
+ * Write option bytes
+ * @param sl
+ * @param option_byte value to write
+ * @return 0 on success, -ve on failure.
+ */
+static int stlink_write_option_bytes_f2(stlink_t *sl, uint32_t option_byte) {
+    uint32_t val;
+
+    stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+    if (val & FLASH_F2_OPT_LOCK_BIT) {
+        WLOG("Unlocking option flash\n");
+        //Unlock the FLASH_OPT_CR register (FLASH Programming manual page 15)
+        //https://www.st.com/resource/en/programming_manual/cd00233952.pdf
+        stlink_write_debug32(sl, FLASH_F2_OPT_KEYR, 0x08192A3B);
+        stlink_write_debug32(sl, FLASH_F2_OPT_KEYR, 0x4C5D6E7F);
+
+        stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+        if (val & FLASH_F2_OPT_LOCK_BIT) {
+            ELOG("Option flash unlock failed! System reset required to be able to unlock it again!\n");
+            return -1;
+        }
+    }
+
+    stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+    WLOG("option bytes CR = %x\n",val);
+
+    stlink_write_debug32(sl, FLASH_F2_OPT_CR, option_byte & 0x0FFFFFFC);
+
+    stlink_write_debug32(sl, FLASH_F2_OPT_CR, (option_byte & 0x0FFFFFFC)|0x00000002);
+
+
+    stlink_read_debug32(sl, FLASH_F2_SR, &val);
+    WLOG("wait BSY flag to be 0\n");
+
+    while(val & 0x00010000){
+        stlink_read_debug32(sl, FLASH_F2_SR, &val);
+    }
+    WLOG("BSY flag is 0\n");
+
+    stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+    WLOG("option bytes CR = %x\n",val);
+    WLOG("Option flash re-lock\n");
+    stlink_write_debug32(sl, FLASH_F2_OPT_CR, val | 0x00000001);
+
+    DLOG("STM32 F2 option bytes are written\n");
+
+	return 0;
+}
+
+/**
+ * Read option bytes
+ * @param sl
+ * @param option_byte value to write
+ * @return 0 on success, -ve on failure.
+ */
+int stlink_read_option_bytes_f2(stlink_t *sl, uint32_t* option_byte) {
+    uint32_t val;
+
+    stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+    if (val & FLASH_F2_OPT_LOCK_BIT) {
+        WLOG("Unlocking option flash\n");
+        //Unlock the FLASH_OPT_CR register (FLASH Programming manual page 15)
+        //https://www.st.com/resource/en/programming_manual/cd00233952.pdf
+        stlink_write_debug32(sl, FLASH_F2_OPT_KEYR, 0x08192A3B);
+        stlink_write_debug32(sl, FLASH_F2_OPT_KEYR, 0x4C5D6E7F);
+
+        stlink_read_debug32(sl, FLASH_F2_OPT_CR, &val);
+        if (val & FLASH_F2_OPT_LOCK_BIT) {
+            ELOG("Option flash unlock failed! System reset required to be able to unlock it again!\n");
+            return -1;
+        }
+    }
+
+    stlink_read_debug32(sl, FLASH_F2_OPT_CR, option_byte);
+    WLOG("option bytes CR = %x\n",option_byte);
+
+    WLOG("Option flash re-lock\n");
+    stlink_write_debug32(sl, FLASH_F2_OPT_CR, val | 0x00000001);
+
+	return 0;
+}
+
 /**
  * Write option bytes
  * @param sl
@@ -2662,7 +2762,7 @@ int stlink_write_option_bytes(stlink_t *sl, stm32_addr_t addr, uint8_t* base, ui
         return stlink_write_option_bytes_l0_cat2(sl, base, len);
     }
     else {
-        ELOG("Option bytes writing is currently only supported for the STM32G0 and STM32L0\n");
+        ELOG("Option bytes writing is currently only supported for the STM32F2, STM32G0 and STM32L0\n");
         return -1;
     }
 
@@ -2690,3 +2790,21 @@ int stlink_fwrite_option_bytes(stlink_t *sl, const char* path, stm32_addr_t addr
     unmap_file(&mf);
     return err;
 }
+
+/**
+ * Write the given 32-bit value with option byte
+ * @param sl
+ * @param option_byte value to write
+ * @return 0 on success, -ve on failure.
+ */
+int stlink_fwrite_option_bytes_32bit(stlink_t *sl, uint32_t val) {
+
+    if(sl->chip_id == STLINK_CHIPID_STM32_F2){
+        return stlink_write_option_bytes_f2(sl, val);
+    }
+    else
+    {
+        ELOG("Option bytes writing is currently only supported for the STM32F2, STM32G0 and STM32L0\n");
+        return -1;
+    }
+}

src/tools/flash.c

@@ -38,6 +38,8 @@ static void usage(void)
     puts("                       fsize: Use decimal, octal or hex by prefix 0xXXX for hex, optionally followed by k=KB, or m=MB (eg. --flash=128k)");
     puts("                       Format may be 'binary' (default) or 'ihex', although <addr> must be specified for binary format only.");
     puts("                       ./st-flash [--version]");
+    puts("example write option byte: ./st-flash --debug --reset --area=option write 0xXXXXXXXX");
+    puts("example read option byte: ./st-flash --debug --reset --area=option read > option_byte");
 }
 
 int main(int ac, char** av)
@@ -131,15 +133,13 @@ int main(int ac, char** av)
     if (o.cmd == FLASH_CMD_WRITE) /* write */
     {
         size_t size = 0;
-
         if(o.format == FLASH_FORMAT_IHEX) {
             err = stlink_parse_ihex(o.filename, stlink_get_erased_pattern(sl), &mem, &size, &o.addr);
             if (err == -1) {
                 printf("Cannot parse %s as Intel-HEX file\n", o.filename);
                 goto on_error;
             }
         }
-
         if ((o.addr >= sl->flash_base) &&
                 (o.addr < sl->flash_base + sl->flash_size)) {
             if(o.format == FLASH_FORMAT_IHEX)
@@ -164,14 +164,22 @@ int main(int ac, char** av)
                 goto on_error;
             }
         }
-        else if (o.addr == STM32_G0_OPTION_BYTES_BASE || o.addr == STM32_L0_CAT2_OPTION_BYTES_BASE) {
+        else if (o.addr == STM32_G0_OPTION_BYTES_BASE || o.addr == STM32_L0_CAT2_OPTION_BYTES_BASE){
             err = stlink_fwrite_option_bytes(sl, o.filename, o.addr);
             if (err == -1)
             {
                 printf("stlink_fwrite_option_bytes() == -1\n");
                 goto on_error;
             }
         }
+        else if (o.area == FLASH_OPTION_BYTES){
+            err = stlink_fwrite_option_bytes_32bit(sl, o.val);
+            if (err == -1)
+            {
+                printf("stlink_fwrite_option_bytes() == -1\n");
+                goto on_error;
+            }
+        }
         else {
             err = -1;
             printf("Unknown memory region\n");
@@ -201,13 +209,25 @@ int main(int ac, char** av)
     }
     else /* read */
     {
-        if ((o.addr >= sl->flash_base) && (o.size == 0) &&
-                (o.addr < sl->flash_base + sl->flash_size))
+        if(o.area == FLASH_OPTION_BYTES){
+            if(sl->chip_id == STLINK_CHIPID_STM32_F2){
+                uint32_t option_byte = 0;
+                err = stlink_read_option_bytes_f2(sl,&option_byte);
+                printf("%x\n",option_byte);
+            }else{
+                printf("This format is available for STM32F2 Only\n");
+            }
+        }
+        else if ((o.addr >= sl->flash_base) && (o.size == 0) &&
+                (o.addr < sl->flash_base + sl->flash_size)){
             o.size = sl->flash_size;
+            err = stlink_fread(sl, o.filename, o.format == FLASH_FORMAT_IHEX, o.addr, o.size);
+        }
         else if ((o.addr >= sl->sram_base) && (o.size == 0) &&
-                (o.addr < sl->sram_base + sl->sram_size))
+                (o.addr < sl->sram_base + sl->sram_size)){
             o.size = sl->sram_size;
-        err = stlink_fread(sl, o.filename, o.format == FLASH_FORMAT_IHEX, o.addr, o.size);
+            err = stlink_fread(sl, o.filename, o.format == FLASH_FORMAT_IHEX, o.addr, o.size);
+        }
         if (err == -1)
         {
             printf("stlink_fread() == -1\n");

src/tools/flash_opts.c

@@ -58,6 +58,29 @@ int flash_get_opts(struct flash_opts* o, int ac, char** av)
 
             serial_specified = true;
         }
+        else if (strcmp(av[0], "--area") == 0 || starts_with(av[0], "--area=")) {
+            const char * area;
+            if(strcmp(av[0], "--area") == 0) {
+                ac--;
+                av++;
+                if (ac < 1) return -1;
+                area = av[0];
+            }
+            else {
+                area = av[0] + strlen("--area=");
+            }
+            if (strcmp(area, "main") == 0)
+                o->area = FLASH_MAIN_MEMORY;
+            else if (strcmp(area, "system") == 0)
+                o->area = FLASH_SYSTEM_MEMORY;
+            else if (strcmp(area, "otp") == 0)
+                o->area = FLASH_OTP;
+            else if (strcmp(area, "option") == 0)
+                o->area = FLASH_OPTION_BYTES;
+            else
+                return -1;
+
+        }
         else if (strcmp(av[0], "--format") == 0 || starts_with(av[0], "--format=")) {
             const char * format;
             if(strcmp(av[0], "--format") == 0) {
@@ -149,6 +172,7 @@ int flash_get_opts(struct flash_opts* o, int ac, char** av)
             break;
 
         case FLASH_CMD_READ:     // expect filename, addr and size
+            if((o->area == FLASH_OPTION_BYTES) &&(ac == 0)) break;
             if (ac != 3) return -1;
 
             o->filename = av[0];
@@ -161,7 +185,12 @@ int flash_get_opts(struct flash_opts* o, int ac, char** av)
             break;
 
         case FLASH_CMD_WRITE:
-            if(o->format == FLASH_FORMAT_BINARY) {    // expect filename and addr
+            if(o->area == FLASH_OPTION_BYTES){
+                if(ac != 1) return -1;
+
+                o->val = (uint32_t)strtoul(av[0], &tail, 16);
+            }
+            else if(o->format == FLASH_FORMAT_BINARY) {    // expect filename and addr
                 if (ac != 2) return -1;
 
                 o->filename = av[0];