diff --git a/src/helper/startup.tcl b/src/helper/startup.tcl
index e60ad976f..1b5c06e25 100644
--- a/src/helper/startup.tcl
+++ b/src/helper/startup.tcl
@@ -160,4 +160,14 @@ proc ocd_gdb_restart {target_num} {
 	# Fix!!! we're resetting all targets here! Really we should reset only
 	# one target
 	reset halt
-}
\ No newline at end of file
+}
+
+
+# If RCLK is not supported, use fallback_speed_khz
+proc jtag_rclk {fallback_speed_khz} {
+	if {[catch {jtag_khz 0}]!=0} {
+		jtag_khz $fallback_speed_khz
+	}
+}
+
+add_help_text jtag_rclk "fallback_speed_khz - set JTAG speed to RCLK or use fallback speed"
\ No newline at end of file
diff --git a/src/target/target/str912.cfg b/src/target/target/str912.cfg
index c583a4d64..ca2fb8ca4 100644
--- a/src/target/target/str912.cfg
+++ b/src/target/target/str912.cfg
@@ -2,14 +2,14 @@
 
 # jtag speed. We need to stick to 16kHz until we've finished reset.
 
-jtag_khz 16
+jtag_rclk 16
 proc target_0_pre_reset {} {
-	jtag_khz 16
+	jtag_rclk 16
 }
 
 proc target_0_post_reset {} {
 	# We can increase speed now that we know the target is halted.
-	jtag_khz 3000
+	jtag_rclk 3000
 	
 	# -- Enable 96K RAM
 	# PFQBC enabled / DTCM & AHB wait-states disabled