diff --git a/axfer/subcmd-transfer.c b/axfer/subcmd-transfer.c
index a165a93..36817f3 100644
--- a/axfer/subcmd-transfer.c
+++ b/axfer/subcmd-transfer.c
@@ -447,7 +447,7 @@ int subcmd_transfer(int argc, char *const *argv, snd_pcm_stream_t direction)
 	err = context_init(&ctx, direction, argc, argv);
 	if (err < 0)
 		goto end;
-	if (ctx.xfer.help)
+	if (ctx.xfer.help || ctx.xfer.dump_hw_params)
 		goto end;
 
 	err = context_pre_process(&ctx, direction, &expected_frame_count);
diff --git a/axfer/xfer-libasound.c b/axfer/xfer-libasound.c
index bf1b056..60e9aab 100644
--- a/axfer/xfer-libasound.c
+++ b/axfer/xfer-libasound.c
@@ -99,6 +99,15 @@ static int open_handle(struct xfer_context *xfer)
 
 	// TODO: Applying NO_PERIOD_WAKEUP should be done here.
 
+	if (xfer->dump_hw_params) {
+		logging(state, "Available HW Params of node: %s\n",
+			snd_pcm_name(state->handle));
+		snd_pcm_hw_params_dump(state->hw_params, state->log);
+		// TODO: there're more parameters which are not dumped by
+		// alsa-lib.
+		return 0;
+	}
+
 	return set_access_hw_param(state);
 }
 
diff --git a/axfer/xfer-options.c b/axfer/xfer-options.c
index 7790ea9..21fc6bb 100644
--- a/axfer/xfer-options.c
+++ b/axfer/xfer-options.c
@@ -16,6 +16,7 @@
 enum no_short_opts {
 	// 128 or later belong to non us-ascii character set.
 	OPT_XFER_TYPE = 128,
+	OPT_DUMP_HW_PARAMS,
 };
 
 static int allocate_paths(struct xfer_context *xfer, char *const *paths,
@@ -244,6 +245,8 @@ int xfer_options_parse_args(struct xfer_context *xfer,
 		{"file-type",		1, 0, 't'},
 		// For mapper.
 		{"separate-channels",	0, 0, 'I'},
+		// For debugging.
+		{"dump-hw-params",	0, 0, OPT_DUMP_HW_PARAMS},
 	};
 	char *s_opts;
 	struct option *l_opts;
@@ -302,6 +305,8 @@ int xfer_options_parse_args(struct xfer_context *xfer,
 			xfer->cntr_format_literal = arg_duplicate_string(optarg, &err);
 		else if (key == 'I')
 			xfer->multiple_cntrs = true;
+		else if (key == OPT_DUMP_HW_PARAMS)
+			xfer->dump_hw_params = true;
 		else if (key == '?')
 			return -EINVAL;
 		else {
diff --git a/axfer/xfer.h b/axfer/xfer.h
index 0ed84e4..a234851 100644
--- a/axfer/xfer.h
+++ b/axfer/xfer.h
@@ -34,6 +34,7 @@ struct xfer_context {
 	unsigned int samples_per_frame;
 	bool help:1;
 	bool quiet:1;
+	bool dump_hw_params:1;
 	bool multiple_cntrs:1;	// For mapper.
 
 	snd_pcm_format_t sample_format;