jtag: jtag_add_ir_scan() now takes a single field
[openocd.git] / src / target / target.c
index d3d1beee08bd00a181145252cf2c609cd7fb9f8e..1eb14352aeacd13c57370185904e09d9137af9a7 100644 (file)
@@ -35,6 +35,7 @@
 
 #include <helper/time_support.h>
 #include <jtag/jtag.h>
+#include <flash/nor/core.h>
 
 #include "target.h"
 #include "target_type.h"
 #include "image.h"
 
 
-static int target_array2mem(Jim_Interp *interp, struct target *target, int argc, Jim_Obj *const *argv);
-static int target_mem2array(Jim_Interp *interp, struct target *target, int argc, Jim_Obj *const *argv);
+static int target_array2mem(Jim_Interp *interp, struct target *target,
+               int argc, Jim_Obj *const *argv);
+static int target_mem2array(Jim_Interp *interp, struct target *target,
+               int argc, Jim_Obj *const *argv);
 
 /* targets */
 extern struct target_type arm7tdmi_target;
@@ -422,6 +425,36 @@ int target_halt(struct target *target)
        return ERROR_OK;
 }
 
+/**
+ * Make the target (re)start executing using its saved execution
+ * context (possibly with some modifications).
+ *
+ * @param target Which target should start executing.
+ * @param current True to use the target's saved program counter instead
+ *     of the address parameter
+ * @param address Optionally used as the program counter.
+ * @param handle_breakpoints True iff breakpoints at the resumption PC
+ *     should be skipped.  (For example, maybe execution was stopped by
+ *     such a breakpoint, in which case it would be counterprodutive to
+ *     let it re-trigger.
+ * @param debug_execution False if all working areas allocated by OpenOCD
+ *     should be released and/or restored to their original contents.
+ *     (This would for example be true to run some downloaded "helper"
+ *     algorithm code, which resides in one such working buffer and uses
+ *     another for data storage.)
+ *
+ * @todo Resolve the ambiguity about what the "debug_execution" flag
+ * signifies.  For example, Target implementations don't agree on how
+ * it relates to invalidation of the register cache, or to whether
+ * breakpoints and watchpoints should be enabled.  (It would seem wrong
+ * to enable breakpoints when running downloaded "helper" algorithms
+ * (debug_execution true), since the breakpoints would be set to match
+ * target firmware being debugged, not the helper algorithm.... and
+ * enabling them could cause such helpers to malfunction (for example,
+ * by overwriting data with a breakpoint instruction.  On the other
+ * hand the infrastructure for running such helpers might use this
+ * procedure but rely on hardware breakpoint to detect termination.)
+ */
 int target_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution)
 {
        int retval;
@@ -433,13 +466,21 @@ int target_resume(struct target *target, int current, uint32_t address, int hand
                return ERROR_FAIL;
        }
 
-       /* note that resume *must* be asynchronous. The CPU can halt before we poll. The CPU can
-        * even halt at the current PC as a result of a software breakpoint being inserted by (a bug?)
-        * the application.
+       /* note that resume *must* be asynchronous. The CPU can halt before
+        * we poll. The CPU can even halt at the current PC as a result of
+        * a software breakpoint being inserted by (a bug?) the application.
         */
        if ((retval = target->type->resume(target, current, address, handle_breakpoints, debug_execution)) != ERROR_OK)
                return retval;
 
+       /* Invalidate any cached protect/erase/... flash status, since
+        * almost all targets will now be able modify the flash by
+        * themselves.  We want flash drivers and infrastructure to
+        * be able to rely on (non-invalidated) cached state.
+        *
+        * REVISIT do the same for NAND ; maybe other flash flavors too...
+        */
+       nor_resume(target);
        return retval;
 }
 
@@ -475,6 +516,11 @@ int target_process_reset(struct command_context *cmd_ctx, enum target_reset_mode
        /* We want any events to be processed before the prompt */
        retval = target_call_timer_callbacks_now();
 
+       struct target *target;
+       for (target = all_targets; target; target = target->next) {
+               target->type->check_reset(target);
+       }
+
        return retval;
 }
 
@@ -497,6 +543,12 @@ static int default_examine(struct target *target)
        return ERROR_OK;
 }
 
+/* no check by default */
+static int default_check_reset(struct target *target)
+{
+       return ERROR_OK;
+}
+
 int target_examine_one(struct target *target)
 {
        return target->type->examine(target);
@@ -706,6 +758,9 @@ static int target_init_one(struct command_context *cmd_ctx,
        if (type->examine == NULL)
                type->examine = default_examine;
 
+       if (type->check_reset== NULL)
+               type->check_reset = default_check_reset;
+
        int retval = type->init_target(cmd_ctx, target);
        if (ERROR_OK != retval)
        {
@@ -1723,15 +1778,6 @@ static int sense_handler(void)
        return ERROR_OK;
 }
 
-static void target_call_event_callbacks_all(enum target_event e) {
-       struct target *target;
-       target = all_targets;
-       while (target) {
-               target_call_event_callbacks(target, e);
-               target = target->next;
-       }
-}
-
 /* process target state changes */
 static int handle_target(void *priv)
 {
@@ -1751,7 +1797,7 @@ static int handle_target(void *priv)
                int did_something = 0;
                if (runSrstAsserted)
                {
-                       target_call_event_callbacks_all(TARGET_EVENT_GDB_HALT);
+                       LOG_INFO("srst asserted detected, running srst_asserted proc.");
                        Jim_Eval(interp, "srst_asserted");
                        did_something = 1;
                }
@@ -1762,7 +1808,7 @@ static int handle_target(void *priv)
                }
                if (runPowerDropout)
                {
-                       target_call_event_callbacks_all(TARGET_EVENT_GDB_HALT);
+                       LOG_INFO("Power dropout detected, running power_dropout proc.");
                        Jim_Eval(interp, "power_dropout");
                        did_something = 1;
                }
@@ -1804,6 +1850,14 @@ static int handle_target(void *priv)
                        /* polling may fail silently until the target has been examined */
                        if ((retval = target_poll(target)) != ERROR_OK)
                        {
+                               /* FIX!!!!! If we add a LOG_INFO() here to output a line in GDB
+                                * *why* we are aborting GDB, then we'll spam telnet when the
+                                * poll is failing persistently.
+                                *
+                                * If we could implement an event that detected the
+                                * target going from non-pollable to pollable, we could issue
+                                * an error only upon the transition.
+                                */
                                target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
                                return retval;
                        }
@@ -2154,7 +2208,7 @@ static void handle_md_output(struct command_context *cmd_ctx,
        const char *value_fmt;
        switch (size) {
        case 4: value_fmt = "%8.8x "; break;
-       case 2: value_fmt = "%4.2x "; break;
+       case 2: value_fmt = "%4.4x "; break;
        case 1: value_fmt = "%2.2x "; break;
        default:
                /* "can't happen", caller checked */
@@ -2960,7 +3014,8 @@ static void writeGmon(uint32_t *samples, uint32_t sampleNum, const char *filenam
        fclose(f);
 }
 
-/* profiling samples the CPU PC as quickly as OpenOCD is able, which will be used as a random sampling of PC */
+/* profiling samples the CPU PC as quickly as OpenOCD is able,
+ * which will be used as a random sampling of PC */
 COMMAND_HANDLER(handle_profile_command)
 {
        struct target *target = get_current_target(CMD_CTX);
@@ -2976,6 +3031,12 @@ COMMAND_HANDLER(handle_profile_command)
 
        timeval_add_time(&timeout, offset, 0);
 
+       /**
+        * @todo: Some cores let us sample the PC without the
+        * annoying halt/resume step; for example, ARMv7 PCSR.
+        * Provide a way to use that more efficient mechanism.
+        */
+
        command_print(CMD_CTX, "Starting profiling. Halting and resuming the target as often as we can...");
 
        static const int maxSample = 10000;
@@ -3287,7 +3348,9 @@ static int jim_array2mem(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 
        return target_array2mem(interp,target, argc-1, argv + 1);
 }
-static int target_array2mem(Jim_Interp *interp, struct target *target, int argc, Jim_Obj *const *argv)
+
+static int target_array2mem(Jim_Interp *interp, struct target *target,
+               int argc, Jim_Obj *const *argv)
 {
        long l;
        uint32_t width;
@@ -3789,11 +3852,13 @@ static int target_configure(Jim_GetOptInfo *goi, struct target *target)
        return JIM_OK;
 }
 
-static int jim_target_configure(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+static int
+jim_target_configure(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 {
        Jim_GetOptInfo goi;
+
        Jim_GetOpt_Setup(&goi, interp, argc - 1, argv + 1);
-       goi.isconfigure = strcmp(Jim_GetString(argv[0], NULL), "configure") == 0;
+       goi.isconfigure = !strcmp(Jim_GetString(argv[0], NULL), "configure");
        int need_args = 1 + goi.isconfigure;
        if (goi.argc < need_args)
        {
@@ -3988,13 +4053,15 @@ static int jim_target_md(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
        return JIM_OK;
 }
 
-static int jim_target_mem2array(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+static int jim_target_mem2array(Jim_Interp *interp,
+               int argc, Jim_Obj *const *argv)
 {
        struct target *target = Jim_CmdPrivData(interp);
        return target_mem2array(interp, target, argc - 1, argv + 1);
 }
 
-static int jim_target_array2mem(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+static int jim_target_array2mem(Jim_Interp *interp,
+               int argc, Jim_Obj *const *argv)
 {
        struct target *target = Jim_CmdPrivData(interp);
        return target_array2mem(interp, target, argc - 1, argv + 1);
@@ -4026,6 +4093,21 @@ static int jim_target_examine(Jim_Interp *interp, int argc, Jim_Obj *const *argv
        return JIM_OK;
 }
 
+static int jim_target_halt_gdb(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       if (argc != 1)
+       {
+               Jim_WrongNumArgs(interp, 1, argv, "[no parameters]");
+               return JIM_ERR;
+       }
+       struct target *target = Jim_CmdPrivData(interp);
+
+       if (target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT) != ERROR_OK)
+               return JIM_ERR;
+
+       return JIM_OK;
+}
+
 static int jim_target_poll(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 {
        if (argc != 1)
@@ -4219,108 +4301,129 @@ static const struct command_registration target_instance_command_handlers[] = {
        {
                .name = "configure",
                .mode = COMMAND_CONFIG,
-               .jim_handler = &jim_target_configure,
-               .usage = "[<target_options> ...]",
+               .jim_handler = jim_target_configure,
                .help  = "configure a new target for use",
+               .usage = "[target_attribute ...]",
        },
        {
                .name = "cget",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_configure,
-               .usage = "<target_type> [<target_options> ...]",
-               .help  = "configure a new target for use",
+               .jim_handler = jim_target_configure,
+               .help  = "returns the specified target attribute",
+               .usage = "target_attribute",
        },
        {
                .name = "mww",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_mw,
-               .usage = "<address> <data> [<count>]",
+               .jim_handler = jim_target_mw,
                .help = "Write 32-bit word(s) to target memory",
+               .usage = "address data [count]",
        },
        {
                .name = "mwh",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_mw,
-               .usage = "<address> <data> [<count>]",
+               .jim_handler = jim_target_mw,
                .help = "Write 16-bit half-word(s) to target memory",
+               .usage = "address data [count]",
        },
        {
                .name = "mwb",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_mw,
-               .usage = "<address> <data> [<count>]",
+               .jim_handler = jim_target_mw,
                .help = "Write byte(s) to target memory",
+               .usage = "address data [count]",
        },
        {
                .name = "mdw",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_md,
-               .usage = "<address> [<count>]",
+               .jim_handler = jim_target_md,
                .help = "Display target memory as 32-bit words",
+               .usage = "address [count]",
        },
        {
                .name = "mdh",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_md,
-               .usage = "<address> [<count>]",
+               .jim_handler = jim_target_md,
                .help = "Display target memory as 16-bit half-words",
+               .usage = "address [count]",
        },
        {
                .name = "mdb",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_md,
-               .usage = "<address> [<count>]",
+               .jim_handler = jim_target_md,
                .help = "Display target memory as 8-bit bytes",
+               .usage = "address [count]",
        },
        {
                .name = "array2mem",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_array2mem,
+               .jim_handler = jim_target_array2mem,
+               .help = "Writes Tcl array of 8/16/32 bit numbers "
+                       "to target memory",
+               .usage = "arrayname bitwidth address count",
        },
        {
                .name = "mem2array",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_mem2array,
+               .jim_handler = jim_target_mem2array,
+               .help = "Loads Tcl array of 8/16/32 bit numbers "
+                       "from target memory",
+               .usage = "arrayname bitwidth address count",
        },
        {
                .name = "eventlist",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_event_list,
+               .jim_handler = jim_target_event_list,
+               .help = "displays a table of events defined for this target",
        },
        {
                .name = "curstate",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_current_state,
+               .jim_handler = jim_target_current_state,
+               .help = "displays the current state of this target",
        },
        {
                .name = "arp_examine",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_examine,
+               .jim_handler = jim_target_examine,
+               .help = "used internally for reset processing",
+       },
+       {
+               .name = "arp_halt_gdb",
+               .mode = COMMAND_EXEC,
+               .jim_handler = jim_target_halt_gdb,
+               .help = "used internally for reset processing to halt GDB",
        },
        {
                .name = "arp_poll",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_poll,
+               .jim_handler = jim_target_poll,
+               .help = "used internally for reset processing",
        },
        {
                .name = "arp_reset",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_reset,
+               .jim_handler = jim_target_reset,
+               .help = "used internally for reset processing",
        },
        {
                .name = "arp_halt",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_halt,
+               .jim_handler = jim_target_halt,
+               .help = "used internally for reset processing",
        },
        {
                .name = "arp_waitstate",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_wait_state,
+               .jim_handler = jim_target_wait_state,
+               .help = "used internally for reset processing",
        },
        {
                .name = "invoke-event",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_target_invoke_event,
+               .jim_handler = jim_target_invoke_event,
+               .help = "invoke handler for specified event",
+               .usage = "event_name",
        },
        COMMAND_REGISTRATION_DONE
 };
@@ -4472,7 +4575,7 @@ static int target_create(Jim_GetOptInfo *goi)
                }
                *tpp = target;
        }
-       
+
        /* now - create the new target name command */
        const const struct command_registration target_subcommands[] = {
                {
@@ -4615,51 +4718,54 @@ static const struct command_registration target_subcommand_handlers[] = {
        {
                .name = "init",
                .mode = COMMAND_CONFIG,
-               .handler = &handle_target_init_command,
+               .handler = handle_target_init_command,
                .help = "initialize targets",
        },
        {
                .name = "create",
+               /* REVISIT this should be COMMAND_CONFIG ... */
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_create,
-               .usage = "<name> <type> ...",
-               .help = "Returns the currently selected target",
+               .jim_handler = jim_target_create,
+               .usage = "name type '-chain-position' name [options ...]",
+               .help = "Creates and selects a new target",
        },
        {
                .name = "current",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_current,
+               .jim_handler = jim_target_current,
                .help = "Returns the currently selected target",
        },
        {
                .name = "types",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_types,
-               .help = "Returns the available target types as a list of strings",
+               .jim_handler = jim_target_types,
+               .help = "Returns the available target types as "
+                               "a list of strings",
        },
        {
                .name = "names",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_names,
+               .jim_handler = jim_target_names,
                .help = "Returns the names of all targets as a list of strings",
        },
        {
                .name = "number",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_number,
-               .usage = "<number>",
-               .help = "Returns the name of target <n>",
+               .jim_handler = jim_target_number,
+               .usage = "number",
+               .help = "Returns the name of the numbered target "
+                       "(DEPRECATED)",
        },
        {
                .name = "count",
                .mode = COMMAND_ANY,
-               .jim_handler = &jim_target_count,
-               .help = "Returns the number of targets as an integer",
+               .jim_handler = jim_target_count,
+               .help = "Returns the number of targets as an integer "
+                       "(DEPRECATED)",
        },
        COMMAND_REGISTRATION_DONE
 };
 
-
 struct FastLoad
 {
        uint32_t address;
@@ -4833,11 +4939,11 @@ COMMAND_HANDLER(handle_fast_load_command)
 static const struct command_registration target_command_handlers[] = {
        {
                .name = "targets",
-               .handler = &handle_targets_command,
+               .handler = handle_targets_command,
                .mode = COMMAND_ANY,
-               .help = "change current command line target (one parameter) "
-                       "or list targets (no parameters)",
-               .usage = "[<new_current_target>]",
+               .help = "change current default target (one parameter) "
+                       "or prints table of all targets (no parameters)",
+               .usage = "[target]",
        },
        {
                .name = "target",
@@ -4854,72 +4960,92 @@ int target_register_commands(struct command_context *cmd_ctx)
        return register_commands(cmd_ctx, NULL, target_command_handlers);
 }
 
+static bool target_reset_nag = true;
+
+bool get_target_reset_nag(void)
+{
+       return target_reset_nag;
+}
+
+COMMAND_HANDLER(handle_target_reset_nag)
+{
+       return CALL_COMMAND_HANDLER(handle_command_parse_bool,
+                       &target_reset_nag, "Nag after each reset about options to improve "
+                       "performance");
+}
+
 static const struct command_registration target_exec_command_handlers[] = {
        {
                .name = "fast_load_image",
-               .handler = &handle_fast_load_image_command,
+               .handler = handle_fast_load_image_command,
                .mode = COMMAND_ANY,
-               .help = "Load image into memory, mainly for profiling purposes",
-               .usage = "<file> <address> ['bin'|'ihex'|'elf'|'s19'] "
-                       "[min_address] [max_length]",
+               .help = "Load image into server memory for later use by "
+                       "fast_load; primarily for profiling",
+               .usage = "filename address ['bin'|'ihex'|'elf'|'s19'] "
+                       "[min_address [max_length]]",
        },
        {
                .name = "fast_load",
-               .handler = &handle_fast_load_command,
-               .mode = COMMAND_ANY,
+               .handler = handle_fast_load_command,
+               .mode = COMMAND_EXEC,
                .help = "loads active fast load image to current target "
                        "- mainly for profiling purposes",
        },
        {
                .name = "profile",
-               .handler = &handle_profile_command,
+               .handler = handle_profile_command,
                .mode = COMMAND_EXEC,
                .help = "profiling samples the CPU PC",
        },
        /** @todo don't register virt2phys() unless target supports it */
        {
                .name = "virt2phys",
-               .handler = &handle_virt2phys_command,
+               .handler = handle_virt2phys_command,
                .mode = COMMAND_ANY,
                .help = "translate a virtual address into a physical address",
+               .usage = "virtual_address",
        },
-
        {
                .name = "reg",
-               .handler = &handle_reg_command,
+               .handler = handle_reg_command,
                .mode = COMMAND_EXEC,
-               .help = "display or set a register",
+               .help = "display or set a register; with no arguments, "
+                       "displays all registers and their values",
+               .usage = "[(register_name|register_number) [value]]",
        },
-
        {
                .name = "poll",
-               .handler = &handle_poll_command,
+               .handler = handle_poll_command,
                .mode = COMMAND_EXEC,
-               .help = "poll target state",
+               .help = "poll target state; or reconfigure background polling",
+               .usage = "['on'|'off']",
        },
        {
                .name = "wait_halt",
-               .handler = &handle_wait_halt_command,
+               .handler = handle_wait_halt_command,
                .mode = COMMAND_EXEC,
-               .help = "wait for target halt",
-               .usage = "[time (s)]",
+               .help = "wait up to the specified number of milliseconds "
+                       "(default 5) for a previously requested halt",
+               .usage = "[milliseconds]",
        },
        {
                .name = "halt",
-               .handler = &handle_halt_command,
+               .handler = handle_halt_command,
                .mode = COMMAND_EXEC,
-               .help = "halt target",
+               .help = "request target to halt, then wait up to the specified"
+                       "number of milliseconds (default 5) for it to complete",
+               .usage = "[milliseconds]",
        },
        {
                .name = "resume",
-               .handler = &handle_resume_command,
+               .handler = handle_resume_command,
                .mode = COMMAND_EXEC,
-               .help = "resume target",
-               .usage = "[<address>]",
+               .help = "resume target execution from current PC or address",
+               .usage = "[address]",
        },
        {
                .name = "reset",
-               .handler = &handle_reset_command,
+               .handler = handle_reset_command,
                .mode = COMMAND_EXEC,
                .usage = "[run|halt|init]",
                .help = "Reset all targets into the specified mode."
@@ -4927,133 +5053,135 @@ static const struct command_registration target_exec_command_handlers[] = {
        },
        {
                .name = "soft_reset_halt",
-               .handler = &handle_soft_reset_halt_command,
+               .handler = handle_soft_reset_halt_command,
                .mode = COMMAND_EXEC,
                .help = "halt the target and do a soft reset",
        },
        {
-
                .name = "step",
-               .handler = &handle_step_command,
+               .handler = handle_step_command,
                .mode = COMMAND_EXEC,
-               .help = "step one instruction from current PC or [addr]",
-               .usage = "[<address>]",
+               .help = "step one instruction from current PC or address",
+               .usage = "[address]",
        },
        {
-
                .name = "mdw",
-               .handler = &handle_md_command,
+               .handler = handle_md_command,
                .mode = COMMAND_EXEC,
                .help = "display memory words",
-               .usage = "[phys] <addr> [count]",
+               .usage = "['phys'] address [count]",
        },
        {
                .name = "mdh",
-               .handler = &handle_md_command,
+               .handler = handle_md_command,
                .mode = COMMAND_EXEC,
                .help = "display memory half-words",
-               .usage = "[phys] <addr> [count]",
+               .usage = "['phys'] address [count]",
        },
        {
                .name = "mdb",
-               .handler = &handle_md_command,
+               .handler = handle_md_command,
                .mode = COMMAND_EXEC,
                .help = "display memory bytes",
-               .usage = "[phys] <addr> [count]",
+               .usage = "['phys'] address [count]",
        },
        {
-
                .name = "mww",
-               .handler = &handle_mw_command,
+               .handler = handle_mw_command,
                .mode = COMMAND_EXEC,
                .help = "write memory word",
-               .usage = "[phys]  <addr> <value> [count]",
+               .usage = "['phys'] address value [count]",
        },
        {
                .name = "mwh",
-               .handler = &handle_mw_command,
+               .handler = handle_mw_command,
                .mode = COMMAND_EXEC,
                .help = "write memory half-word",
-               .usage = "[phys] <addr> <value> [count]",
+               .usage = "['phys'] address value [count]",
        },
        {
                .name = "mwb",
-               .handler = &handle_mw_command,
+               .handler = handle_mw_command,
                .mode = COMMAND_EXEC,
                .help = "write memory byte",
-               .usage = "[phys] <addr> <value> [count]",
+               .usage = "['phys'] address value [count]",
        },
        {
-
                .name = "bp",
-               .handler = &handle_bp_command,
+               .handler = handle_bp_command,
                .mode = COMMAND_EXEC,
-               .help = "list or set breakpoint",
-               .usage = "[<address> <length> [hw]]",
+               .help = "list or set hardware or software breakpoint",
+               .usage = "[address length ['hw']]",
        },
        {
                .name = "rbp",
-               .handler = &handle_rbp_command,
+               .handler = handle_rbp_command,
                .mode = COMMAND_EXEC,
                .help = "remove breakpoint",
-               .usage = "<address>",
+               .usage = "address",
        },
        {
-
                .name = "wp",
-               .handler = &handle_wp_command,
+               .handler = handle_wp_command,
                .mode = COMMAND_EXEC,
-               .help = "list or set watchpoint",
-               .usage = "[<address> <length> <r/w/a> [value] [mask]]",
+               .help = "list (no params) or create watchpoints",
+               .usage = "[address length [('r'|'w'|'a') value [mask]]]",
        },
        {
                .name = "rwp",
-               .handler = &handle_rwp_command,
+               .handler = handle_rwp_command,
                .mode = COMMAND_EXEC,
                .help = "remove watchpoint",
-               .usage = "<address>",
-
+               .usage = "address",
        },
        {
                .name = "load_image",
-               .handler = &handle_load_image_command,
+               .handler = handle_load_image_command,
                .mode = COMMAND_EXEC,
-               .usage = "<file> <address> ['bin'|'ihex'|'elf'|'s19'] "
+               .usage = "filename address ['bin'|'ihex'|'elf'|'s19'] "
                        "[min_address] [max_length]",
        },
        {
                .name = "dump_image",
-               .handler = &handle_dump_image_command,
+               .handler = handle_dump_image_command,
                .mode = COMMAND_EXEC,
-               .usage = "<file> <address> <size>",
+               .usage = "filename address size",
        },
        {
                .name = "verify_image",
-               .handler = &handle_verify_image_command,
+               .handler = handle_verify_image_command,
                .mode = COMMAND_EXEC,
-               .usage = "<file> [offset] [type]",
+               .usage = "filename [offset [type]]",
        },
        {
                .name = "test_image",
-               .handler = &handle_test_image_command,
+               .handler = handle_test_image_command,
                .mode = COMMAND_EXEC,
-               .usage = "<file> [offset] [type]",
+               .usage = "filename [offset [type]]",
        },
        {
                .name = "ocd_mem2array",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_mem2array,
-               .help = "read memory and return as a TCL array "
+               .jim_handler = jim_mem2array,
+               .help = "read 8/16/32 bit memory and return as a TCL array "
                        "for script processing",
-               .usage = "<arrayname> <width=32|16|8> <address> <count>",
+               .usage = "arrayname bitwidth address count",
        },
        {
                .name = "ocd_array2mem",
                .mode = COMMAND_EXEC,
-               .jim_handler = &jim_array2mem,
+               .jim_handler = jim_array2mem,
                .help = "convert a TCL array to memory locations "
-                       "and write the values",
-               .usage = "<arrayname> <width=32|16|8> <address> <count>",
+                       "and write the 8/16/32 bit values",
+               .usage = "arrayname bitwidth address count",
+       },
+       {
+               .name = "reset_nag",
+               .handler = handle_target_reset_nag,
+               .mode = COMMAND_ANY,
+               .help = "Nag after each reset about options that could have been "
+                               "enabled to improve performance. ",
+               .usage = "['enable'|'disable']",
        },
        COMMAND_REGISTRATION_DONE
 };

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