fix error handling in flash fill
[fw/openocd] / src / flash / flash.c
index b3d1aa755855956b8e552a801a7c3b40283829ad..08f3aaff563f795426a5dcfb75e5841b48714e4f 100644 (file)
@@ -2,6 +2,12 @@
  *   Copyright (C) 2005 by Dominic Rath                                    *
  *   Dominic.Rath@gmx.de                                                   *
  *                                                                         *
+ *   Copyright (C) 2007,2008 Ã˜yvind Harboe                                 *
+ *   oyvind.harboe@zylin.com                                               *
+ *                                                                         *
+ *   Copyright (C) 2008 by Spencer Oliver                                  *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
 #include "fileio.h"
 #include "image.h"
 #include "log.h"
+#include "armv4_5.h"
+#include "algorithm.h"
+#include "binarybuffer.h"
+#include "armv7m.h"
 
 #include <string.h>
 #include <unistd.h>
@@ -39,7 +49,6 @@
 
 /* command handlers */
 int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
-int handle_flash_banks_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 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);
@@ -49,8 +58,8 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
 int handle_flash_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
 int handle_flash_write_bank_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_fill_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
@@ -58,32 +67,38 @@ flash_bank_t *get_flash_bank_by_addr(target_t *target, u32 addr);
 extern flash_driver_t lpc2000_flash;
 extern flash_driver_t cfi_flash;
 extern flash_driver_t at91sam7_flash;
+extern flash_driver_t at91sam7_old_flash;
 extern flash_driver_t str7x_flash;
 extern flash_driver_t str9x_flash;
+extern flash_driver_t aduc702x_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;
 extern flash_driver_t ecosflash_flash;
+extern flash_driver_t lpc288x_flash;
+extern flash_driver_t ocl_flash;
 
-flash_driver_t *flash_drivers[] =
-{
+flash_driver_t *flash_drivers[] = {
        &lpc2000_flash,
        &cfi_flash,
        &at91sam7_flash,
+       &at91sam7_old_flash,
        &str7x_flash,
        &str9x_flash,
+       &aduc702x_flash,
        &stellaris_flash,
        &str9xpec_flash,
        &stm32x_flash,
        &tms470_flash,
        &ecosflash_flash,
+       &lpc288x_flash,
+       &ocl_flash,
        NULL,
 };
 
 flash_bank_t *flash_banks;
 static         command_t *flash_cmd;
-static int auto_erase = 0;
 
 /* wafer thin wrapper for invoking the flash driver */
 static int flash_driver_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
@@ -125,23 +140,58 @@ int flash_driver_protect(struct flash_bank_s *bank, int set, int first, int last
        return retval;
 }
 
-
 int flash_register_commands(struct command_context_s *cmd_ctx)
 {
        flash_cmd = register_command(cmd_ctx, NULL, "flash", NULL, COMMAND_ANY, NULL);
 
        register_command(cmd_ctx, flash_cmd, "bank", handle_flash_bank_command, COMMAND_CONFIG, "flash_bank <driver> <base> <size> <chip_width> <bus_width> <target> [driver_options ...]");
-       register_command(cmd_ctx, flash_cmd, "auto_erase", handle_flash_auto_erase_command, COMMAND_ANY,
-                                                "auto erase flash sectors <on|off>");
        return ERROR_OK;
 }
 
+static int jim_flash_banks(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       flash_bank_t *p;
+
+       if (argc != 1) {
+               Jim_WrongNumArgs(interp, 1, argv, "no arguments to flash_banks command");
+               return JIM_ERR;
+       }
+
+       if (!flash_banks)
+       {
+               return JIM_ERR;
+       }
+
+       Jim_Obj *list=Jim_NewListObj(interp, NULL, 0);
+       for (p = flash_banks; p; p = p->next)
+       {
+               Jim_Obj *elem=Jim_NewListObj(interp, NULL, 0);
+
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, "name", -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, p->driver->name, -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, "base", -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewIntObj(interp, p->base));
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, "size", -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewIntObj(interp, p->size));
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, "bus_width", -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewIntObj(interp, p->bus_width));
+               Jim_ListAppendElement(interp, elem, Jim_NewStringObj(interp, "chip_width", -1));
+               Jim_ListAppendElement(interp, elem, Jim_NewIntObj(interp, p->chip_width));
+
+               Jim_ListAppendElement(interp, list, elem);
+       }
+
+       Jim_SetResult(interp, list);
+
+       return JIM_OK;
+}
+
 int flash_init_drivers(struct command_context_s *cmd_ctx)
 {
        if (flash_banks)
        {
-               register_command(cmd_ctx, flash_cmd, "banks", handle_flash_banks_command, COMMAND_EXEC,
-                                                "list configured flash banks ");
+               register_jim(cmd_ctx, "ocd_flash_banks", jim_flash_banks, "return information about the flash banks");
+
                register_command(cmd_ctx, flash_cmd, "info", handle_flash_info_command, COMMAND_EXEC,
                                                 "print info about flash bank <num>");
                register_command(cmd_ctx, flash_cmd, "probe", handle_flash_probe_command, COMMAND_EXEC,
@@ -154,10 +204,18 @@ int flash_init_drivers(struct command_context_s *cmd_ctx)
                                                 "erase sectors at <bank> <first> <last>");
                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, "fillw", handle_flash_fill_command, COMMAND_EXEC,
+                                                "fill with pattern (no autoerase) <address> <word_pattern> <count>");
+               register_command(cmd_ctx, flash_cmd, "fillh", handle_flash_fill_command, COMMAND_EXEC,
+                                                "fill with pattern <address> <halfword_pattern> <count>");
+               register_command(cmd_ctx, flash_cmd, "fillb", handle_flash_fill_command, COMMAND_EXEC,
+                                                "fill with pattern <address> <byte_pattern> <count>");
+
                register_command(cmd_ctx, flash_cmd, "write_bank", handle_flash_write_bank_command, COMMAND_EXEC,
                                                 "write binary data to <bank> <file> <offset>");
                register_command(cmd_ctx, flash_cmd, "write_image", handle_flash_write_image_command, COMMAND_EXEC,
-                                                "write_image <file> [offset] [type]");
+                                                "write_image [erase] <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>");
        }
@@ -181,7 +239,7 @@ flash_bank_t *get_flash_bank_by_num_noprobe(int num)
        return NULL;
 }
 
-int flash_get_bank_count()
+int flash_get_bank_count(void)
 {
        flash_bank_t *p;
        int i = 0;
@@ -212,6 +270,7 @@ flash_bank_t *get_flash_bank_by_num(int num)
 
 int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
+       int retval;
        int i;
        int found = 0;
        target_t *target;
@@ -224,7 +283,7 @@ int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
        if ((target = get_target_by_num(strtoul(args[5], NULL, 0))) == NULL)
        {
                LOG_ERROR("target %lu not defined", strtoul(args[5], NULL, 0));
-               return ERROR_OK;
+               return ERROR_FAIL;
        }
 
        for (i = 0; flash_drivers[i]; i++)
@@ -237,7 +296,7 @@ int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
                        if (flash_drivers[i]->register_commands(cmd_ctx) != ERROR_OK)
                        {
                                LOG_ERROR("couldn't register '%s' commands", args[0]);
-                               exit(-1);
+                               return ERROR_FAIL;
                        }
 
                        c = malloc(sizeof(flash_bank_t));
@@ -252,11 +311,11 @@ int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
                        c->sectors = NULL;
                        c->next = NULL;
 
-                       if (flash_drivers[i]->flash_bank_command(cmd_ctx, cmd, args, argc, c) != ERROR_OK)
+                       if ((retval=flash_drivers[i]->flash_bank_command(cmd_ctx, cmd, args, argc, c)) != ERROR_OK)
                        {
                                LOG_ERROR("'%s' driver rejected flash bank at 0x%8.8x", args[0], c->base);
                                free(c);
-                               return ERROR_OK;
+                               return retval;
                        }
 
                        /* put flash bank in linked list */
@@ -280,27 +339,7 @@ int handle_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
        if (!found)
        {
                LOG_ERROR("flash driver '%s' not found", args[0]);
-               exit(-1);
-       }
-
-       return ERROR_OK;
-}
-
-int handle_flash_banks_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
-{
-       flash_bank_t *p;
-       int i = 0;
-
-       if (!flash_banks)
-       {
-               command_print(cmd_ctx, "no flash banks configured");
-               return ERROR_OK;
-       }
-
-       for (p = flash_banks; p; p = p->next)
-       {
-               command_print(cmd_ctx, "#%i: %s at 0x%8.8x, size 0x%8.8x, buswidth %i, chipwidth %i",
-                                         i++, p->driver->name, p->base, p->size, p->bus_width, p->chip_width);
+               return ERROR_FAIL;
        }
 
        return ERROR_OK;
@@ -325,20 +364,14 @@ int handle_flash_info_command(struct command_context_s *cmd_ctx, char *cmd, char
                        char buf[1024];
 
                        /* attempt auto probe */
-                       p->driver->auto_probe(p);
+                       if ((retval = p->driver->auto_probe(p)) != ERROR_OK)
+                               return retval;
 
                        command_print(cmd_ctx, "#%i: %s at 0x%8.8x, size 0x%8.8x, buswidth %i, chipwidth %i",
                                                i, p->driver->name, p->base, p->size, p->bus_width, p->chip_width);
                        for (j = 0; j < p->num_sectors; j++)
                        {
-                               char *erase_state, *protect_state;
-
-                               if (p->sectors[j].is_erased == 0)
-                                       erase_state = "not erased";
-                               else if (p->sectors[j].is_erased == 1)
-                                       erase_state = "erased";
-                               else
-                                       erase_state = "erase state unknown";
+                               char *protect_state;
 
                                if (p->sectors[j].is_protected == 0)
                                        protect_state = "not protected";
@@ -347,9 +380,9 @@ 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%x %ikB) %s, %s",
+                               command_print(cmd_ctx, "\t#%3i: 0x%8.8x (0x%x %ikB) %s",
                                                        j, p->sectors[j].offset, p->sectors[j].size, p->sectors[j].size>>10,
-                                                       erase_state, protect_state);
+                                                       protect_state);
                        }
 
                        *buf = '\0'; /* initialize buffer, otherwise it migh contain garbage if driver function fails */
@@ -412,6 +445,7 @@ int handle_flash_erase_check_command(struct command_context_s *cmd_ctx, char *cm
        p = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
        if (p)
        {
+               int j;
                if ((retval = p->driver->erase_check(p)) == ERROR_OK)
                {
                        command_print(cmd_ctx, "successfully checked erase state", p->driver->name, p->base);
@@ -421,6 +455,23 @@ int handle_flash_erase_check_command(struct command_context_s *cmd_ctx, char *cm
                        command_print(cmd_ctx, "unknown error when checking erase state of flash bank #%s at 0x%8.8x",
                                args[0], p->base);
                }
+
+               for (j = 0; j < p->num_sectors; j++)
+               {
+                       char *erase_state;
+
+                       if (p->sectors[j].is_erased == 0)
+                               erase_state = "not erased";
+                       else if (p->sectors[j].is_erased == 1)
+                               erase_state = "erased";
+                       else
+                               erase_state = "erase state unknown";
+
+                       command_print(cmd_ctx, "\t#%3i: 0x%8.8x (0x%x %ikB) %s",
+                                               j, p->sectors[j].offset, p->sectors[j].size, p->sectors[j].size>>10,
+                                               erase_state);
+               }
+
        }
 
        return ERROR_OK;
@@ -453,7 +504,7 @@ int handle_flash_erase_address_command(struct command_context_s *cmd_ctx, char *
        p = get_flash_bank_by_addr(target, address);
        if (p == NULL)
        {
-               return ERROR_COMMAND_SYNTAX_ERROR;
+               return ERROR_FAIL;
        }
 
        /* We can't know if we did a resume + halt, in which case we no longer know the erased state */
@@ -463,7 +514,10 @@ int handle_flash_erase_address_command(struct command_context_s *cmd_ctx, char *
 
        if ((retval = flash_erase_address_range(target, address, length)) == ERROR_OK)
        {
-               duration_stop_measure(&duration, &duration_text);
+               if ((retval = duration_stop_measure(&duration, &duration_text)) != ERROR_OK)
+               {
+                       return retval;
+               }
                command_print(cmd_ctx, "erased address 0x%8.8x length %i in %s", address, length, duration_text);
                free(duration_text);
        }
@@ -525,7 +579,10 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
 
                if ((retval = flash_driver_erase(p, first, last)) == ERROR_OK)
                {
-                       duration_stop_measure(&duration, &duration_text);
+                       if ((retval = duration_stop_measure(&duration, &duration_text)) != ERROR_OK)
+                       {
+                               return retval;
+                       }
 
                        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);
@@ -588,18 +645,34 @@ int handle_flash_write_image_command(struct command_context_s *cmd_ctx, char *cm
        duration_t duration;
        char *duration_text;
 
-       int retval;
+       int retval, retvaltemp;
 
        if (argc < 1)
        {
                return ERROR_COMMAND_SYNTAX_ERROR;
+       }
 
+       /* flash auto-erase is disabled by default*/
+       int auto_erase = 0;
+
+       if (strcmp(args[0], "erase")==0)
+       {
+               auto_erase = 1;
+               args++;
+               argc--;
+               command_print(cmd_ctx, "auto erase enabled");
+       }
+
+
+       if (argc < 1)
+       {
+               return ERROR_COMMAND_SYNTAX_ERROR;
        }
 
        if (!target)
        {
                LOG_ERROR("no target selected");
-               return ERROR_OK;
+               return ERROR_FAIL;
        }
 
        duration_start_measure(&duration);
@@ -624,19 +697,22 @@ int handle_flash_write_image_command(struct command_context_s *cmd_ctx, char *cm
        }
 
        retval = flash_write(target, &image, &written, auto_erase);
-
        if (retval != ERROR_OK)
        {
                image_close(&image);
                return retval;
        }
 
-       duration_stop_measure(&duration, &duration_text);
+       if ((retvaltemp = duration_stop_measure(&duration, &duration_text)) != ERROR_OK)
+       {
+               image_close(&image);
+               return retvaltemp;
+       }
        if (retval == ERROR_OK)
        {
-       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)));
+               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);
 
@@ -645,6 +721,108 @@ int handle_flash_write_image_command(struct command_context_s *cmd_ctx, char *cm
        return retval;
 }
 
+int handle_flash_fill_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+       int err = ERROR_OK, retval;
+       u32 address;
+       u32 pattern;
+       u32 count;
+       u8 chunk[1024];
+       u32 wrote = 0;
+       int chunk_count;
+       char *duration_text;
+       duration_t duration;
+       target_t *target = get_current_target(cmd_ctx);
+       u32 i;
+       int wordsize;
+
+       if (argc != 3)
+       {
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       address = strtoul(args[0], NULL, 0);
+       pattern = strtoul(args[1], NULL, 0);
+       count   = strtoul(args[2], NULL, 0);
+
+       if(count == 0)
+               return ERROR_OK;
+
+
+       switch(cmd[4])
+       {
+       case 'w':
+               wordsize=4;
+               break;
+       case 'h':
+               wordsize=2;
+               break;
+       case 'b':
+               wordsize=1;
+               break;
+       default:
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       chunk_count = MIN(count, (1024 / wordsize));
+       switch(wordsize)
+       {
+       case 4:
+               for(i = 0; i < chunk_count; i++)
+               {
+                       target_buffer_set_u32(target, chunk + i * wordsize, pattern);
+               }
+               break;
+       case 2:
+               for(i = 0; i < chunk_count; i++)
+               {
+                       target_buffer_set_u16(target, chunk + i * wordsize, pattern);
+               }
+               break;
+       case 1:
+               memset(chunk, pattern, chunk_count);
+               break;
+       default:
+               LOG_ERROR("BUG: can't happen");
+               exit(-1);
+       }
+
+       duration_start_measure(&duration);
+
+       for (wrote=0; wrote<(count*wordsize); wrote+=sizeof(chunk))
+       {
+               int cur_size = MIN( (count*wordsize - wrote) , 1024 );
+               flash_bank_t *bank;
+               bank = get_flash_bank_by_addr(target, address);
+               if(bank == NULL)
+               {
+                       return ERROR_FAIL;
+               }
+               err = flash_driver_write(bank, chunk, address - bank->base + wrote, cur_size);
+               if (err!=ERROR_OK)
+                       return err;
+               wrote += cur_size;
+       }
+
+       if ((retval = duration_stop_measure(&duration, &duration_text)) != ERROR_OK)
+       {
+               return retval;
+       }
+
+
+       if(err == ERROR_OK)
+       {
+               float speed;
+               speed=wrote / 1024.0;
+               speed/=((float)duration.duration.tv_sec + ((float)duration.duration.tv_usec / 1000000.0));
+               command_print(cmd_ctx, "wrote %d bytes to 0x%8.8x in %s (%f kb/s)",
+                       count*wordsize, address, duration_text,
+                       speed);
+       }
+       free(duration_text);
+       return ERROR_OK;
+}
+
 int handle_flash_write_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        u32 offset;
@@ -656,7 +834,7 @@ int handle_flash_write_bank_command(struct command_context_s *cmd_ctx, char *cmd
        duration_t duration;
        char *duration_text;
 
-       int retval;
+       int retval, retvaltemp;
        flash_bank_t *p;
 
        if (argc != 3)
@@ -682,14 +860,21 @@ int handle_flash_write_bank_command(struct command_context_s *cmd_ctx, char *cmd
        buffer = malloc(fileio.size);
        if (fileio_read(&fileio, fileio.size, buffer, &buf_cnt) != ERROR_OK)
        {
+               free(buffer);
+               fileio_close(&fileio);
                return ERROR_OK;
        }
 
        retval = flash_driver_write(p, buffer, offset, buf_cnt);
 
        free(buffer);
+       buffer = NULL;
 
-       duration_stop_measure(&duration, &duration_text);
+       if ((retvaltemp = duration_stop_measure(&duration, &duration_text)) != ERROR_OK)
+       {
+               fileio_close(&fileio);
+               return retvaltemp;
+       }
        if (retval!=ERROR_OK)
        {
        command_print(cmd_ctx, "wrote  %"PRIi64" byte from file %s to flash bank %i at offset 0x%8.8x in %s (%f kb/s)",
@@ -735,7 +920,7 @@ flash_bank_t *get_flash_bank_by_addr(target_t *target, u32 addr)
                        return NULL;
                }
                /* check whether address belongs to this flash bank */
-               if ((addr >= c->base) && (addr < c->base + c->size) && target == c->target)
+               if ((addr >= c->base) && (addr <= c->base + (c->size - 1)) && target == c->target)
                        return c;
        }
        LOG_ERROR("No flash at address 0x%08x\n", addr);
@@ -754,7 +939,10 @@ int flash_erase_address_range(target_t *target, u32 addr, u32 length)
                return ERROR_FLASH_DST_OUT_OF_BANK; /* no corresponding bank found */
 
        if (c->size == 0 || c->num_sectors == 0)
+       {
+               LOG_ERROR("Bank is invalid");
                return ERROR_FLASH_BANK_INVALID;
+       }
 
        if (length == 0)
        {
@@ -791,11 +979,12 @@ int flash_erase_address_range(target_t *target, u32 addr, u32 length)
 /* write (optional verify) an image to flash memory of the given target */
 int flash_write(target_t *target, image_t *image, u32 *written, int erase)
 {
-       int retval;
+       int retval=ERROR_OK;
 
        int section;
        u32 section_offset;
        flash_bank_t *c;
+       int *padding;
 
        section = 0;
        section_offset = 0;
@@ -811,6 +1000,9 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
                flash_set_dirty();
        }
 
+       /* allocate padding array */
+       padding = malloc(image->num_sections * sizeof(padding));
+
        /* loop until we reach end of the image */
        while (section < image->num_sections)
        {
@@ -820,6 +1012,7 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
                int section_last;
                u32 run_address = image->sections[section].base_address + section_offset;
                u32 run_size = image->sections[section].size - section_offset;
+               int pad_bytes = 0;
 
                if (image->sections[section].size ==  0)
                {
@@ -840,6 +1033,7 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
                /* collect consecutive sections which fall into the same bank */
                section_first = section;
                section_last = section;
+               padding[section] = 0;
                while ((run_address + run_size < c->base + c->size)
                                && (section_last + 1 < image->num_sections))
                {
@@ -848,9 +1042,17 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
                                LOG_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))
+                       /* if we have multiple sections within our image, flash programming could fail due to alignment issues
+                        * attempt to rebuild a consecutive buffer for the flash loader */
+                       pad_bytes = (image->sections[section_last + 1].base_address) - (run_address + run_size);
+                       if ((run_address + run_size + pad_bytes) > (c->base + c->size))
                                break;
+                       padding[section_last] = pad_bytes;
                        run_size += image->sections[++section_last].size;
+                       run_size += pad_bytes;
+                       padding[section_last] = 0;
+
+                       LOG_INFO("Padding image section %d with %d bytes", section_last-1, pad_bytes );
                }
 
                /* fit the run into bank constraints */
@@ -866,19 +1068,22 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
                {
                        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;
+                       size_read = run_size - buffer_size;
+                       if (size_read > image->sections[section].size - section_offset)
+                           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);
-
+                               free(padding);
                                return retval;
                        }
 
+                       /* see if we need to pad the section */
+                       while (padding[section]--)
+                                (buffer+buffer_size)[size_read++] = 0xff;
+
                        buffer_size += size_read;
                        section_offset += size_read;
 
@@ -907,29 +1112,102 @@ int flash_write(target_t *target, image_t *image, u32 *written, int erase)
 
                if (retval != ERROR_OK)
                {
-                               return retval; /* abort operation */
-                       }
+                       free(padding);
+                       return retval; /* abort operation */
+               }
 
                if (written != NULL)
                        *written += run_size; /* add run size to total written counter */
        }
 
+       free(padding);
+
+       return retval;
+}
+
+int default_flash_mem_blank_check(struct flash_bank_s *bank)
+{
+       target_t *target = bank->target;
+       u8 buffer[1024];
+       int buffer_size = sizeof(buffer);
+       int i;
+       int nBytes;
+
+       if (bank->target->state != TARGET_HALTED)
+       {
+               LOG_ERROR("Target not halted");
+               return ERROR_TARGET_NOT_HALTED;
+       }
+
+       for (i = 0; i < bank->num_sectors; i++)
+       {
+               int j;
+               bank->sectors[i].is_erased = 1;
+
+               for (j = 0; j < bank->sectors[i].size; j += buffer_size)
+               {
+                       int chunk;
+                       int retval;
+                       chunk = buffer_size;
+                       if (chunk > (j - bank->sectors[i].size))
+                       {
+                               chunk = (j - bank->sectors[i].size);
+                       }
+
+                       retval = target->type->read_memory(target, bank->base + bank->sectors[i].offset + j, 4, chunk/4, buffer);
+                       if (retval != ERROR_OK)
+                               return retval;
+
+                       for (nBytes = 0; nBytes < chunk; nBytes++)
+                       {
+                               if (buffer[nBytes] != 0xFF)
+                               {
+                                       bank->sectors[i].is_erased = 0;
+                                       break;
+                               }
+                       }
+               }
+       }
+
        return ERROR_OK;
 }
 
-int handle_flash_auto_erase_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+int default_flash_blank_check(struct flash_bank_s *bank)
 {
-       if (argc != 1)
+       target_t *target = bank->target;
+       int i;
+       int retval;
+       int fast_check = 0;
+       int blank;
+
+       if (bank->target->state != TARGET_HALTED)
        {
-               return ERROR_COMMAND_SYNTAX_ERROR;
+               LOG_ERROR("Target not halted");
+               return ERROR_TARGET_NOT_HALTED;
        }
 
-       if (strcmp(args[0], "on") == 0)
-               auto_erase = 1;
-       else if (strcmp(args[0], "off") == 0)
-               auto_erase = 0;
-       else
-               return ERROR_COMMAND_SYNTAX_ERROR;
+       for (i = 0; i < bank->num_sectors; i++)
+       {
+               u32 address = bank->base + bank->sectors[i].offset;
+               u32 size = bank->sectors[i].size;
+
+               if ((retval = target_blank_check_memory(target, address, size, &blank)) != ERROR_OK)
+               {
+                       fast_check = 0;
+                       break;
+               }
+               if (blank == 0xFF)
+                       bank->sectors[i].is_erased = 1;
+               else
+                       bank->sectors[i].is_erased = 0;
+               fast_check = 1;
+       }
+
+       if (!fast_check)
+       {
+               LOG_USER("Running slow fallback erase check - add working memory");
+               return default_flash_mem_blank_check(bank);
+       }
 
        return ERROR_OK;
 }