X-Git-Url: https://review.openocd.org/gitweb?a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fftdi.c;fp=src%2Fjtag%2Fdrivers%2Fftdi.c;h=f04b390c1717b1c541c2e3e81fa9daa1cbda8ff3;hb=6d1ea5a7a9e2158f5937af66cf0f642a05cd99d1;hp=0a2aec2225e0026b5a0604af4e1d91551f11f2b0;hpb=8f944fc22648da0f6d4d6114d7a9e45c794f70a1;p=openocd.git

diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index 0a2aec2225..f04b390c17 100644
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -247,6 +247,11 @@ static int ftdi_speed_div(int speed, int *khz)
 
 static int ftdi_khz(int khz, int *jtag_speed)
 {
+	if (khz == 0 && !mpsse_is_high_speed(mpsse_ctx)) {
+		LOG_DEBUG("RCLK not supported");
+		return ERROR_FAIL;
+	}
+
 	*jtag_speed = khz * 1000;
 	return ERROR_OK;
 }