Fair enough. Try this then (with some added parameter checking)...

= = =

 doc/openocd.texi  |    6 ++++--
 src/flash/flash.c |   47 ++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 48 insertions(+), 5 deletions(-)

Index: src/flash/flash.c
===================================================================
--- src/flash/flash.c   (revision 2736)
+++ src/flash/flash.c   (working copy)
@@ -559,12 +559,34 @@
        return ERROR_OK;
 }
 
+int flash_check_sector_parameters(struct command_context_s *cmd_ctx, int 
first, int last, int num_sectors)
+{
+       int retval = 0;
+
+       if ( first < 0 || last < 0)
+       {
+               command_print(cmd_ctx, "ERROR: negative sectors are not valid");
+               return ERROR_FAIL;
+       }
+       if ( first >= last )
+       {
+               command_print(cmd_ctx, "ERROR: last sector must be > first 
sector");
+               return ERROR_FAIL;
+       }
+       if ( last > (num_sectors - 1) )
+       {
+               command_print(cmd_ctx, "ERROR: last sector must be =< %d", 
num_sectors - 1);
+               return ERROR_FAIL;
+       }
+       return ERROR_OK;
+}
+
 static int handle_flash_erase_command(struct command_context_s *cmd_ctx, char 
*cmd, char **args, int argc)
 {
        if (argc > 2)
        {
                int first = strtoul(args[1], NULL, 0);
-               int last = strtoul(args[2], NULL, 0);
+               int last;
                int retval;
                flash_bank_t *p = get_flash_bank_by_num(strtoul(args[0], NULL, 
0));
                duration_t duration;
@@ -577,6 +599,16 @@
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
 
+               if (strcmp(args[2], "last") == 0)
+                       last = p->num_sectors - 1;
+               else
+                       last = strtoul(args[2], NULL, 0);
+
+               if ((retval = flash_check_sector_parameters(cmd_ctx, first, 
last, p->num_sectors)) != ERROR_OK)
+               {
+                       return retval;
+               }
+
                if ((retval = flash_driver_erase(p, first, last)) == ERROR_OK)
                {
                        if ((retval = duration_stop_measure(&duration, 
&duration_text)) != ERROR_OK)
@@ -602,7 +634,7 @@
        if (argc > 3)
        {
                int first = strtoul(args[1], NULL, 0);
-               int last = strtoul(args[2], NULL, 0);
+               int last;
                int set;
                int retval;
                flash_bank_t *p = get_flash_bank_by_num(strtoul(args[0], NULL, 
0));
@@ -621,6 +653,16 @@
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
 
+               if (strcmp(args[2], "last") == 0)
+                       last = p->num_sectors - 1;
+               else
+                       last = strtoul(args[2], NULL, 0);
+
+               if ((retval = flash_check_sector_parameters(cmd_ctx, first, 
last, p->num_sectors)) != ERROR_OK)
+               {
+                       return retval;
+               }
+
                retval = flash_driver_protect(p, set, first, last);
                if (retval == ERROR_OK)
                {
@@ -632,7 +674,6 @@
        else
        {
                return ERROR_COMMAND_SYNTAX_ERROR;
-
        }
 
        return ERROR_OK;
Index: doc/openocd.texi
===================================================================
--- doc/openocd.texi    (revision 2736)
+++ doc/openocd.texi    (working copy)
@@ -3071,7 +3071,8 @@
 @anchor{flash erase_sector}
 @deffn Command {flash erase_sector} num first last
 Erase sectors in bank @var{num}, starting at sector @var{first} up to and 
including
-...@var{last}. Sector numbering starts at 0.
+...@var{last}. Sector numbering starts at 0. Defining a @var{last} sector of 
"last" is
+equivalent to defining (max_sectors-1), i.e. erasing the entire bank.
 The @var{num} parameter is a value shown by @command{flash banks}.
 @end deffn
 
@@ -3144,7 +3145,8 @@
 @anchor{flash protect}
 @deffn Command {flash protect} num first last (on|off)
 Enable (@var{on}) or disable (@var{off}) protection of flash sectors
-...@var{first} to @var{last} of flash bank @var{num}.
+...@var{first} to @var{last} of flash bank @var{num}. Defining a @var{last} 
sector of "last"
+is equivalent to defining (max_sectors-1), i.e. protecting the entire bank.
 The @var{num} parameter is a value shown by @command{flash banks}.
 @end deffn
 
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