diff --git a/src/helper/command.c b/src/helper/command.c
index 708a8024f..5f3fae510 100644
--- a/src/helper/command.c
+++ b/src/helper/command.c
@@ -954,3 +954,53 @@ DEFINE_PARSE_LONG(_int, int, n < INT_MIN, INT_MAX)
 DEFINE_PARSE_LONG(_s32, int32_t, n < INT32_MIN, INT32_MAX)
 DEFINE_PARSE_LONG(_s16, int16_t, n < INT16_MIN, INT16_MAX)
 DEFINE_PARSE_LONG(_s8, int8_t, n < INT8_MIN, INT8_MAX)
+
+int command_parse_bool(const char *in, bool *out,
+		const char *on, const char *off)
+{
+	if (strcasecmp(in, on) == 0)
+		*out = true;
+	else if (strcasecmp(in, off) == 0)
+		*out = false;
+	else
+		return ERROR_COMMAND_SYNTAX_ERROR;
+	return  ERROR_OK;
+}
+
+int command_parse_bool_any(const char *in, bool *out)
+{
+	if (command_parse_bool(in, out, "on", "off") == ERROR_OK)
+		return ERROR_OK;
+	if (command_parse_bool(in, out, "enable", "disable") == ERROR_OK)
+		return ERROR_OK;
+	if (command_parse_bool(in, out, "true", "false") == ERROR_OK)
+		return ERROR_OK;
+	if (command_parse_bool(in, out, "yes", "no") == ERROR_OK)
+		return ERROR_OK;
+	if (command_parse_bool(in, out, "1", "0") == ERROR_OK)
+		return ERROR_OK;
+	return ERROR_INVALID_ARGUMENTS;
+}
+
+COMMAND_HELPER(handle_command_parse_bool, bool *out, const char *label)
+{
+	switch (CMD_ARGC) {
+	case 1: {
+		const char *in = CMD_ARGV[0];
+		if (command_parse_bool_any(in, out) != ERROR_OK)
+		{
+			LOG_ERROR("%s: argument '%s' is not valid", CMD_NAME, in);
+			return ERROR_INVALID_ARGUMENTS;
+		}
+		// fall through
+	}
+	case 0:
+		LOG_INFO("%s is %s", label, *out ? "enabled" : "disabled");
+		break;
+	default:
+		return ERROR_INVALID_ARGUMENTS;
+	}
+	return ERROR_OK;
+}
+
+
diff --git a/src/helper/command.h b/src/helper/command.h
index 9f2d97124..06403eff5 100644
--- a/src/helper/command.h
+++ b/src/helper/command.h
@@ -271,19 +271,22 @@ DECLARE_PARSE_WRAPPER(_s8, int8_t);
  */
 #define COMMAND_PARSE_BOOL(in, out, on, off) \
 	do { \
-		if (strcmp(in, on) == 0) \
-			out = true; \
-		else if (strcmp(in, off) == 0) \
-			out = false; \
-		else { \
+		bool value; \
+		int retval = command_parse_bool(in, &value, on, off); \
+		if (ERROR_OK != retval) { \
 			command_print(CMD_CTX, stringify(out) \
 				" option value ('%s') is not valid", in); \
 			command_print(CMD_CTX, "  choices are '%s' or '%s'", \
 				on, off); \
-			return ERROR_COMMAND_SYNTAX_ERROR; \
+			return retval; \
 		} \
+		out = value; \
 	} while (0)
 
+int command_parse_bool(const char *in, bool *out,
+		const char *on, const char *off);
+COMMAND_HELPER(handle_command_parse_bool, bool *out, const char *label);
+
 /// parses an on/off command argument
 #define COMMAND_PARSE_ON_OFF(in, out) \
 		COMMAND_PARSE_BOOL(in, out, "on", "off")
diff --git a/src/target/arm11.c b/src/target/arm11.c
index 6e007cfa4..58b5d5423 100644
--- a/src/target/arm11.c
+++ b/src/target/arm11.c
@@ -1981,52 +1981,17 @@ static int arm11_build_reg_cache(struct target *target)
 	return ERROR_OK;
 }
 
-static COMMAND_HELPER(arm11_handle_bool, bool *var, char *name)
-{
-	if (CMD_ARGC == 0)
-	{
-		LOG_INFO("%s is %s.", name, *var ? "enabled" : "disabled");
-		return ERROR_OK;
-	}
+#define ARM11_BOOL_WRAPPER(name, print_name)	\
+		COMMAND_HANDLER(arm11_handle_bool_##name) \
+		{ \
+			return CALL_COMMAND_HANDLER(handle_command_parse_bool, \
+					&arm11_config_##name, print_name); \
+		}
 
-	if (CMD_ARGC != 1)
-		return ERROR_COMMAND_SYNTAX_ERROR;
-
-	switch (CMD_ARGV[0][0])
-	{
-	case '0':	/* 0 */
-	case 'f':	/* false */
-	case 'F':
-	case 'd':	/* disable */
-	case 'D':
-		*var = false;
-		break;
-
-	case '1':	/* 1 */
-	case 't':	/* true */
-	case 'T':
-	case 'e':	/* enable */
-	case 'E':
-		*var = true;
-		break;
-	}
-
-	LOG_INFO("%s %s.", *var ? "Enabled" : "Disabled", name);
-
-	return ERROR_OK;
-}
-
-#define BOOL_WRAPPER(name, print_name)	\
-COMMAND_HANDLER(arm11_handle_bool_##name) \
-{ \
-	return CALL_COMMAND_HANDLER(arm11_handle_bool, \
-			&arm11_config_##name, print_name); \
-}
-
-BOOL_WRAPPER(memwrite_burst,			"memory write burst mode")
-BOOL_WRAPPER(memwrite_error_fatal,		"fatal error mode for memory writes")
-BOOL_WRAPPER(step_irq_enable,			"IRQs while stepping")
-BOOL_WRAPPER(hardware_step,			"hardware single step")
+ARM11_BOOL_WRAPPER(memwrite_burst, "memory write burst mode")
+ARM11_BOOL_WRAPPER(memwrite_error_fatal, "fatal error mode for memory writes")
+ARM11_BOOL_WRAPPER(step_irq_enable, "IRQs while stepping")
+ARM11_BOOL_WRAPPER(hardware_step, "hardware single step")
 
 COMMAND_HANDLER(arm11_handle_vcr)
 {