- add missing files from previous commit (tms470 flash driver)
[openocd.git] / src / flash / flash.c
index f5c83f80c43ffdc43cdd8e6cd60758f1af0a63ab..2e7cc4537e2f7e41421bbe6b8536d71d22ef5217 100644 (file)
 
 #include "flash.h"
 #include "command.h"
-#include "log.h"
 #include "target.h"
 #include "time_support.h"
+#include "fileio.h"
+#include "image.h"
+#include "log.h"
 
 #include <string.h>
 #include <unistd.h>
@@ -33,8 +35,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
-
-#include <fileio.h>
+#include <inttypes.h>
 
 /* command handlers */
 int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
@@ -42,10 +43,15 @@ int handle_flash_banks_command(struct command_context_s *cmd_ctx, char *cmd, cha
 int handle_flash_info_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_probe_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_erase_check_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int handle_flash_erase_address_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_protect_check_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int handle_flash_write_binary_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int handle_flash_write_image_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_protect_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int handle_flash_auto_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+flash_bank_t *get_flash_bank_by_addr(target_t *target, u32 addr);
 
 /* flash drivers
  */
@@ -54,6 +60,10 @@ extern flash_driver_t cfi_flash;
 extern flash_driver_t at91sam7_flash;
 extern flash_driver_t str7x_flash;
 extern flash_driver_t str9x_flash;
+extern flash_driver_t stellaris_flash;
+extern flash_driver_t str9xpec_flash;
+extern flash_driver_t stm32x_flash;
+extern flash_driver_t tms470_flash;
 
 flash_driver_t *flash_drivers[] =
 {
@@ -62,11 +72,16 @@ flash_driver_t *flash_drivers[] =
        &at91sam7_flash,
        &str7x_flash,
        &str9x_flash,
+       &stellaris_flash,
+       &str9xpec_flash,
+       &stm32x_flash,
+       &tms470_flash,
        NULL,
 };
 
 flash_bank_t *flash_banks;
 static         command_t *flash_cmd;
+static int auto_erase = 0;
 
 int flash_register_commands(struct command_context_s *cmd_ctx)
 {
@@ -77,7 +92,7 @@ int flash_register_commands(struct command_context_s *cmd_ctx)
        return ERROR_OK;
 }
 
-int flash_init(struct command_context_s *cmd_ctx)
+int flash_init_drivers(struct command_context_s *cmd_ctx)
 {
        if (flash_banks)
        {
@@ -92,11 +107,21 @@ int flash_init(struct command_context_s *cmd_ctx)
                register_command(cmd_ctx, flash_cmd, "protect_check", handle_flash_protect_check_command, COMMAND_EXEC,
                                                 "check protection state of sectors in flash bank <num>");
                register_command(cmd_ctx, flash_cmd, "erase", handle_flash_erase_command, COMMAND_EXEC,
+                                                "DEPRECATED, use 'erase_sector' instead");
+               register_command(cmd_ctx, flash_cmd, "erase_sector", handle_flash_erase_command, COMMAND_EXEC,
                                                 "erase sectors at <bank> <first> <last>");
-               register_command(cmd_ctx, flash_cmd, "write", handle_flash_write_command, COMMAND_EXEC,
+               register_command(cmd_ctx, flash_cmd, "erase_address", handle_flash_erase_address_command, COMMAND_EXEC,
+                                                "erase address range <address> <length>");
+               register_command(cmd_ctx, flash_cmd, "write", handle_flash_write_binary_command, COMMAND_EXEC,
+                                                "DEPRECATED, use 'write_binary' instead");
+               register_command(cmd_ctx, flash_cmd, "write_binary", handle_flash_write_binary_command, COMMAND_EXEC,
                                                 "write binary <bank> <file> <offset>");
+               register_command(cmd_ctx, flash_cmd, "write_image", handle_flash_write_image_command, COMMAND_EXEC,
+                                                "write_image <file> [offset] [type]");
                register_command(cmd_ctx, flash_cmd, "protect", handle_flash_protect_command, COMMAND_EXEC,
                                                 "set protection of sectors at <bank> <first> <last> <on|off>");
+               register_command(cmd_ctx, flash_cmd, "auto_erase", handle_flash_auto_erase_command, COMMAND_EXEC,
+                                                "auto erase flash sectors <on|off>");
        }
        
        return ERROR_OK;
@@ -118,16 +143,24 @@ flash_bank_t *get_flash_bank_by_num(int num)
        return NULL;
 }
 
-/* flash_bank <driver> <base> <size> <chip_width> <bus_width> [driver_options ...]
+/* flash_bank <driver> <base> <size> <chip_width> <bus_width> <target> [driver_options ...]
  */
 int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        int i;
        int found = 0;
+       target_t *target;
                
-       if (argc < 5)
+       if (argc < 6)
        {
                WARNING("incomplete flash_bank configuration");
+               WARNING("flash_bank <driver> <base> <size> <chip_width> <bus_width> <target> [driver_options ...]");
+               return ERROR_OK;
+       }
+       
+       if ((target = get_target_by_num(strtoul(args[5], NULL, 0))) == NULL)
+       {
+               ERROR("target %lu not defined", strtoul(args[5], NULL, 0));
                return ERROR_OK;
        }
        
@@ -145,12 +178,15 @@ int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
                        }
                        
                        c = malloc(sizeof(flash_bank_t));
+                       c->target = target;
                        c->driver = flash_drivers[i];
                        c->driver_priv = NULL;
                        c->base = strtoul(args[1], NULL, 0);
                        c->size = strtoul(args[2], NULL, 0);
                        c->chip_width = strtoul(args[3], NULL, 0);
                        c->bus_width = strtoul(args[4], NULL, 0);
+                       c->num_sectors = 0;
+                       c->sectors = NULL;
                        c->next = NULL;
                        
                        if (flash_drivers[i]->flash_bank_command(cmd_ctx, cmd, args, argc, c) != ERROR_OK)
@@ -219,9 +255,9 @@ int handle_flash_info_command(struct command_context_s *cmd_ctx, char *cmd, char
                return ERROR_OK;
        }
        
-       for (p = flash_banks; p; p = p->next)
+       for (p = flash_banks; p; p = p->next, i++)
        {
-               if (i++ == strtoul(args[0], NULL, 0))
+               if (i == strtoul(args[0], NULL, 0))
                {
                        char buf[1024];
                        
@@ -245,8 +281,8 @@ int handle_flash_info_command(struct command_context_s *cmd_ctx, char *cmd, char
                                else
                                        protect_state = "protection state unknown";
 
-                               command_print(cmd_ctx, "\t#%i: 0x%8.8x (0x%xkB) %s, %s",
-                                                       j, p->sectors[j].offset, p->sectors[j].size,
+                               command_print(cmd_ctx, "\t#%i: 0x%8.8x (0x%x %ikB) %s, %s",
+                                                       j, p->sectors[j].offset, p->sectors[j].size, p->sectors[j].size>>10,
                                                        erase_state, protect_state);
                        }
                        
@@ -327,6 +363,76 @@ int handle_flash_erase_check_command(struct command_context_s *cmd_ctx, char *cm
        return ERROR_OK;
 }
 
+int handle_flash_erase_address_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+       flash_bank_t *p;
+       int retval;
+       int address;
+       int length;
+       duration_t duration;
+       char *duration_text;
+       
+       target_t *target = get_current_target(cmd_ctx);
+
+       if (argc != 2)
+       {
+               command_print(cmd_ctx, "usage: flash erase_address <address> <length>");
+               return ERROR_OK;
+       }
+       
+       address = strtoul(args[0], NULL, 0);
+       length = strtoul(args[1], NULL, 0);
+       if (length <= 0)
+       {
+               command_print(cmd_ctx, "Length must be >0");
+               return ERROR_INVALID_ARGUMENTS;
+       }
+
+       p = get_flash_bank_by_addr(target, address);
+       if (p == NULL)
+       {
+               command_print(cmd_ctx, "No flash at that address");
+               return ERROR_INVALID_ARGUMENTS;
+       }
+       
+       /* We can't know if we did a resume + halt, in which case we no longer know the erased state */
+       flash_set_dirty();
+       
+       duration_start_measure(&duration);
+       
+       if ((retval = flash_erase_address_range(target, address, length)) != ERROR_OK)
+       {
+               switch (retval)
+               {
+                       case ERROR_TARGET_NOT_HALTED:
+                               command_print(cmd_ctx, "can't work with this flash while target is running");
+                               break;
+                       case ERROR_INVALID_ARGUMENTS:
+                               command_print(cmd_ctx, "usage: flash erase_address <address> <length>");
+                               break;
+                       case ERROR_FLASH_BANK_INVALID:
+                               command_print(cmd_ctx, "no '%s' flash found at 0x%8.8x", p->driver->name, p->base);
+                               break;
+                       case ERROR_FLASH_OPERATION_FAILED:
+                               command_print(cmd_ctx, "flash erase error");
+                               break;
+                       case ERROR_FLASH_SECTOR_INVALID:
+                               command_print(cmd_ctx, "sector number(s) invalid");
+                               break;
+                       default:
+                               command_print(cmd_ctx, "unknown error");
+               }
+       }
+       else
+       {
+               duration_stop_measure(&duration, &duration_text);       
+               command_print(cmd_ctx, "erased address 0x%8.8x length %i in %s", address, length, duration_text);
+               free(duration_text);
+       }
+       
+       return retval;
+}
+
 int handle_flash_protect_check_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        flash_bank_t *p;
@@ -370,9 +476,10 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
                int last = strtoul(args[2], NULL, 0);
                int retval;
                flash_bank_t *p = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-               struct timeval start, end, duration;
-
-               gettimeofday(&start, NULL);
+               duration_t duration;
+               char *duration_text;
+       
+               duration_start_measure(&duration);
        
                if (!p)
                {
@@ -408,10 +515,10 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
                }
                else
                {
-                       gettimeofday(&end, NULL);       
-                       timeval_subtract(&duration, &end, &start);
-               
-                       command_print(cmd_ctx, "erased sectors %i through %i on flash bank %i in %is %ius", first, last, strtoul(args[0], 0, 0), duration.tv_sec, duration.tv_usec);
+                       duration_stop_measure(&duration, &duration_text);       
+                       
+                       command_print(cmd_ctx, "erased sectors %i through %i on flash bank %i in %s", first, last, strtoul(args[0], 0, 0), duration_text);
+                       free(duration_text);
                }
        }
        else
@@ -486,16 +593,102 @@ int handle_flash_protect_command(struct command_context_s *cmd_ctx, char *cmd, c
        return ERROR_OK;
 }
 
-int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+int handle_flash_write_image_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+       target_t *target = get_current_target(cmd_ctx);
+       
+       image_t image;
+       u32 written;
+       char *error_str;
+       int *failed;
+       
+       int i;
+       
+       duration_t duration;
+       char *duration_text;
+       
+       int retval;
+
+       if (argc < 1)
+       {
+               command_print(cmd_ctx, "usage: flash %s <file> [offset] [type]", cmd);
+               return ERROR_INVALID_ARGUMENTS;
+       }
+       
+       if (!target)
+       {
+               ERROR("no target selected");
+               return ERROR_OK;
+       }
+       
+       duration_start_measure(&duration);
+       
+       if (argc >= 2)
+       {
+               image.base_address_set = 1;
+               image.base_address = strtoul(args[1], NULL, 0);
+       }
+       else
+       {
+               image.base_address_set = 0;
+               image.base_address = 0x0;
+       }
+       
+       image.start_address_set = 0;
+
+       retval = image_open(&image, args[0], (argc == 3) ? args[2] : NULL);
+       if (retval != ERROR_OK)
+       {
+               command_print(cmd_ctx, "image_open error: %s", image.error_str);
+               return retval;
+       }
+       
+       failed = malloc(sizeof(int) * image.num_sections);
+
+       error_str = NULL;
+               
+       retval = flash_write(target, &image, &written, &error_str, failed, auto_erase);
+       
+       if (retval != ERROR_OK)
+       {
+               if (error_str)
+               {
+                       command_print(cmd_ctx, "failed writing image %s: %s", args[0], error_str);
+                       free(error_str);
+               }
+               image_close(&image);
+               free(failed);
+               return retval;
+       }
+       
+       for (i = 0; i < image.num_sections; i++)
+       {
+               if (failed[i])
+               {
+                       command_print(cmd_ctx, "didn't write section at 0x%8.8x, size 0x%8.8x",
+                                       image.sections[i].base_address, image.sections[i].size);
+               }
+       }
+       
+       duration_stop_measure(&duration, &duration_text);
+       command_print(cmd_ctx, "wrote %u byte from file %s in %s (%f kb/s)",
+               written, args[0], duration_text,
+               (float)written / 1024.0 / ((float)duration.duration.tv_sec + ((float)duration.duration.tv_usec / 1000000.0)));
+       free(duration_text);
+       free(failed);
+
+       image_close(&image);
+       
+       return ERROR_OK;
+}
+
+int handle_flash_write_binary_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        u32 offset;
-       u32 binary_size;
        u8 *buffer;
        u32 buf_cnt;
 
-       fileio_t file;
-       fileio_image_t image_info;
-       enum fileio_sec_type sec_type;
+       fileio_t fileio;
        
        duration_t duration;
        char *duration_text;
@@ -505,14 +698,12 @@ int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, cha
 
        if (argc < 3)
        {
-               command_print(cmd_ctx, "usage: flash write <bank> <file> <offset> [type]");
+               command_print(cmd_ctx, "usage: flash write_binary <bank> <file> <offset>");
                return ERROR_OK;
        }
        
        duration_start_measure(&duration);
        
-       fileio_identify_image_type(&sec_type, (argc == 4) ? args[3] : NULL);
-       
        offset = strtoul(args[2], NULL, 0);
        p = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
        if (!p)
@@ -521,25 +712,24 @@ int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, cha
                return ERROR_OK;
        }
        
-       image_info.base_address = strtoul(args[2], NULL, 0);
-       image_info.has_start_address = 0;
-
-       if (fileio_open(&file, args[1], FILEIO_READ, 
-               FILEIO_IMAGE, &image_info, sec_type) != ERROR_OK)
+       if (fileio_open(&fileio, args[1], FILEIO_READ, FILEIO_BINARY) != ERROR_OK)
        {
-               command_print(cmd_ctx, "flash write error: %s", file.error_str);
+               command_print(cmd_ctx, "flash write_binary error: %s", fileio.error_str);
                return ERROR_OK;
        }
        
-       binary_size = file.size;
-       buffer = malloc(binary_size);
-
-       fileio_read(&file, binary_size, buffer, &buf_cnt);
+       buffer = malloc(fileio.size);
+       if (fileio_read(&fileio, fileio.size, buffer, &buf_cnt) != ERROR_OK)
+       {
+               command_print(cmd_ctx, "flash write_binary error: %s", fileio.error_str);
+               return ERROR_OK;
+       }
        
        if ((retval = p->driver->write(p, buffer, offset, buf_cnt)) != ERROR_OK)
        {
                command_print(cmd_ctx, "failed writing file %s to flash bank %i at offset 0x%8.8x",
                        args[1], strtoul(args[0], NULL, 0), strtoul(args[2], NULL, 0));
+               
                switch (retval)
                {
                        case ERROR_TARGET_NOT_HALTED:
@@ -567,16 +757,291 @@ int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, cha
                                command_print(cmd_ctx, "unknown error");
                }
        }
-       else
+
+       free(buffer);
+       
+       duration_stop_measure(&duration, &duration_text);
+       command_print(cmd_ctx, "wrote  %"PRIi64" byte from file %s to flash bank %i at offset 0x%8.8x in %s (%f kb/s)",
+               fileio.size, args[1], strtoul(args[0], NULL, 0), offset, duration_text,
+               (float)fileio.size / 1024.0 / ((float)duration.duration.tv_sec + ((float)duration.duration.tv_usec / 1000000.0)));
+       free(duration_text);
+
+       fileio_close(&fileio);
+       
+       return ERROR_OK;
+}
+
+void flash_set_dirty(void)
+{
+       flash_bank_t *c;
+       int i;
+       
+       /* set all flash to require erasing */
+       for (c = flash_banks; c; c = c->next)
        {
-               duration_stop_measure(&duration, &duration_text);
-               command_print(cmd_ctx, "wrote file %s to flash bank %i at offset 0x%8.8x in %s",
-                       file.url, strtoul(args[0], NULL, 0), offset, duration_text);
-               free(duration_text);
+               for (i = 0; i < c->num_sectors; i++)
+               {
+                       c->sectors[i].is_erased = 0; 
+               }
+       }
+}
+
+/* lookup flash bank by address */
+flash_bank_t *get_flash_bank_by_addr(target_t *target, u32 addr)
+{
+       flash_bank_t *c;
+
+       /* cycle through bank list */
+       for (c = flash_banks; c; c = c->next)
+       {
+               /* check whether address belongs to this flash bank */
+               if ((addr >= c->base) && (addr < c->base + c->size) && target == c->target)
+                       return c;
+       }
+
+       return NULL;
+}
+
+/* erase given flash region, selects proper bank according to target and address */
+int flash_erase_address_range(target_t *target, u32 addr, u32 length)
+{
+       flash_bank_t *c;
+       int first = -1;
+       int last = -1;
+       int i;
+       
+       if ((c = get_flash_bank_by_addr(target, addr)) == NULL)
+               return ERROR_FLASH_DST_OUT_OF_BANK; /* no corresponding bank found */
+
+       if (c->size == 0 || c->num_sectors == 0)
+               return ERROR_FLASH_BANK_INVALID;
+       
+       if (length == 0)
+       {
+               /* special case, erase whole bank when length is zero */
+               if (addr != c->base)
+                       return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+               
+               return c->driver->erase(c, 0, c->num_sectors - 1);
        }
+
+       /* check whether it fits */
+       if (addr + length > c->base + c->size)
+               return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
        
-       free(buffer);
-       fileio_close(&file);
+       addr -= c->base;
+       
+       for (i = 0; i < c->num_sectors; i++)
+       {               
+               /* check whether sector overlaps with the given range and is not yet erased */
+               if (addr < c->sectors[i].offset + c->sectors[i].size && addr + length > c->sectors[i].offset && c->sectors[i].is_erased != 1) {
+                       /* if first is not set yet then this is the first sector */
+                       if (first == -1)
+                               first = i;
+                       last = i; /* and it is the last one so far in any case */
+               }
+       }
+       
+       if( first == -1 || last == -1 )
+               return ERROR_OK;
+       
+       return c->driver->erase(c, first, last);
+}
+
+/* write (optional verify) an image to flash memory of the given target */
+int flash_write(target_t *target, image_t *image, u32 *written, char **error_str, int *failed, int erase)
+{
+       int retval;
+       int i;
+
+       int section;
+       u32 section_offset;
+       flash_bank_t *c;
+       
+       section = 0;
+       section_offset = 0;
+
+       if (written)
+               *written = 0;
+       
+       if (failed != NULL)
+               for (i = 0; i < image->num_sections; i++)
+                       failed[i] = 0;
+       
+       if (erase)
+       {
+               /* assume all sectors need erasing - stops any problems
+                * when flash_write is called multiple times */
+               
+               flash_set_dirty();
+       }
+       
+       /* loop until we reach end of the image */
+       while (section < image->num_sections)
+       {
+               u32 buffer_size;
+               u8 *buffer;
+               int section_first;
+               int section_last;
+               u32 run_address = image->sections[section].base_address + section_offset;
+               u32 run_size = image->sections[section].size - section_offset;
+
+               if (image->sections[section].size ==  0)
+               {
+                       WARNING("empty section %d", section);
+                       section++;
+                       section_offset = 0;
+                       continue;
+               }
+
+               /* find the corresponding flash bank */
+               if ((c = get_flash_bank_by_addr(target, run_address)) == NULL)
+               {
+                       if (failed == NULL)
+                       {
+                               if (error_str == NULL)
+                                       return ERROR_FLASH_DST_OUT_OF_BANK; /* abort operation */
+                               *error_str = malloc(FLASH_MAX_ERROR_STR);
+                               snprintf(*error_str, FLASH_MAX_ERROR_STR, "no flash mapped at requested address");
+                               return ERROR_FLASH_DST_OUT_OF_BANK; /* abort operation */
+                       }
+                       failed[section] = ERROR_FLASH_DST_OUT_OF_BANK; /* mark the section as failed */
+                       section++; /* and skip it */
+                       section_offset = 0;
+                       continue;
+               }
+
+               /* collect consecutive sections which fall into the same bank */
+               section_first = section;
+               section_last = section;
+               while ((run_address + run_size < c->base + c->size)
+                               && (section_last + 1 < image->num_sections))
+               {
+                       if (image->sections[section_last + 1].base_address < (run_address + run_size))
+                       {
+                               DEBUG("section %d out of order(very slightly surprising, but supported)", section_last + 1);
+                               break;
+                       }
+                       if (image->sections[section_last + 1].base_address != (run_address + run_size))
+                               break;
+                       run_size += image->sections[++section_last].size;
+               }
+
+               /* fit the run into bank constraints */
+               if (run_address + run_size > c->base + c->size)
+                       run_size = c->base + c->size - run_address;
+
+               /* allocate buffer */
+               buffer = malloc(run_size);
+               buffer_size = 0;
+
+               /* read sections to the buffer */
+               while (buffer_size < run_size)
+               {
+                       u32 size_read;
+                       
+                       if (buffer_size - run_size <= image->sections[section].size - section_offset)
+                               size_read = buffer_size - run_size;
+                       else
+                               size_read = image->sections[section].size - section_offset;
+                       
+                       if ((retval = image_read_section(image, section, section_offset,
+                                       size_read, buffer + buffer_size, &size_read)) != ERROR_OK || size_read == 0)
+                       {
+                               free(buffer);
+                               
+                               if (error_str == NULL)
+                                       return ERROR_IMAGE_TEMPORARILY_UNAVAILABLE;
+                               
+                               *error_str = malloc(FLASH_MAX_ERROR_STR);
+                               
+                               /* if image_read_section returned an error there's an error string we can pass on */
+                               if (retval != ERROR_OK)
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "error reading from image: %s", image->error_str);
+                               else
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "error reading from image");
+                               
+                               return ERROR_IMAGE_TEMPORARILY_UNAVAILABLE;
+                       }
+
+                       buffer_size += size_read;
+                       section_offset += size_read;
+
+                       if (section_offset >= image->sections[section].size)
+                       {
+                               section++;
+                               section_offset = 0;
+                       }
+               }
+
+               retval = ERROR_OK;
+               
+               if (erase)
+               {
+                       /* calculate and erase sectors */
+                       retval = flash_erase_address_range( target, run_address, run_size );
+               }
+               
+               if (retval == ERROR_OK)
+               {
+                       /* write flash sectors */
+                       retval = c->driver->write(c, buffer, run_address - c->base, run_size);
+               }
+               
+               free(buffer);
+
+               if (retval != ERROR_OK)
+               {
+                       if (error_str == NULL)
+                               return retval; /* abort operation */
+
+                       *error_str = malloc(FLASH_MAX_ERROR_STR);
+                       switch (retval)
+                       {
+                               case ERROR_TARGET_NOT_HALTED:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "can't flash image while target is running");
+                                       break;
+                               case ERROR_INVALID_ARGUMENTS:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "flash driver can't fulfill request");
+                                       break;
+                               case ERROR_FLASH_OPERATION_FAILED:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "flash program error");
+                                       break;
+                               case ERROR_FLASH_DST_BREAKS_ALIGNMENT:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "offset breaks required alignment");
+                                       break;
+                               case ERROR_FLASH_DST_OUT_OF_BANK:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "no flash mapped at requested address");
+                                       break;
+                               case ERROR_FLASH_SECTOR_NOT_ERASED:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "destination sector(s) not erased");
+                                       break;
+                               default:
+                                       snprintf(*error_str, FLASH_MAX_ERROR_STR, "unknown error: %i", retval);
+                       }
+
+                       return retval; /* abort operation */
+               }
+
+               if (written != NULL)
+                       *written += run_size; /* add run size to total written counter */
+       }
+
+       return ERROR_OK;
+}
+
+int handle_flash_auto_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+       if (argc != 1)
+       {
+               command_print(cmd_ctx, "usage: flash auto_erase <on|off>");
+               return ERROR_OK;
+       }
+       
+       if (strcmp(args[0], "on") == 0)
+               auto_erase = 1;
+       else if (strcmp(args[0], "off") == 0)
+               auto_erase = 0;
        
        return ERROR_OK;
 }

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