diff --git a/src/target/target/lm3s6965.cfg b/src/target/target/lm3s6965.cfg
index 9b21cba0e1ea12261d678f3ef4a5a7d8bed5d9d4..f7ea0abb5acbeeca6e3649d33278ecc09cc2d60a 100644
--- a/src/target/target/lm3s6965.cfg
+++ b/src/target/target/lm3s6965.cfg
@@ -1,3 +1,8 @@
+# script for luminary lm3s6965
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/lm3s811.cfg b/src/target/target/lm3s811.cfg
index 9d13d7b1a46f3a41d6e47d97ded3af6cf220d5d9..f050c2974506d33106539a9878431eebd3afa24a 100644
--- a/src/target/target/lm3s811.cfg
+++ b/src/target/target/lm3s811.cfg
@@ -1,3 +1,8 @@
+# Script for luminary lm3s811
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/stm32.cfg b/src/target/target/stm32.cfg
index 371e4ab3d069c6caab85dd7d4b6e2395a4125697..7779f19a28e31fc5f2741046d7221b845741945e 100644
--- a/src/target/target/stm32.cfg
+++ b/src/target/target/stm32.cfg
@@ -1,3 +1,8 @@
+# script for stm32
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/stm32stick.cfg b/src/target/target/stm32stick.cfg
index 37a282aaa29007143772aa7b2c61954ade8bbfc6..36192c8e496890da27ec15730f9fb5741ba68007 100644
--- a/src/target/target/stm32stick.cfg
+++ b/src/target/target/stm32stick.cfg
@@ -1,4 +1,8 @@
 # Hitex stm32 performance stick
+
+# set jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/str710.cfg b/src/target/target/str710.cfg
index 18a479503627b7714918625dbc289ac25b85d72b..2057ef0038f149a644864d40380e1ca431625ee9 100644
--- a/src/target/target/str710.cfg
+++ b/src/target/target/str710.cfg
@@ -1,5 +1,5 @@
 #start slow, speed up after reset
-jtag_khz 10, 16000
+jtag_khz 10, 6000
 
 #use combined on interfaces or targets that can't set TRST/SRST separately
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str730.cfg b/src/target/target/str730.cfg
index 083701809679aa8608c47a588640579d159e0688..9965fa3d9f1d30038283a3b782455b2ffa7be643 100644
--- a/src/target/target/str730.cfg
+++ b/src/target/target/str730.cfg
@@ -1,5 +1,7 @@
 #STR730 CPU
 
+jtag_khz 10, 3000
+
 #use combined on interfaces or targets that can’t set TRST/SRST separately
 #reset_config trst_and_srst srst_pulls_trst
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str750.cfg b/src/target/target/str750.cfg
index 33136d8640b0225d6144a83b6bc11da63dc56400..c87f5d090d390e34a6f6e0c681a9092dc03b7326 100644
--- a/src/target/target/str750.cfg
+++ b/src/target/target/str750.cfg
@@ -1,5 +1,8 @@
 #STR750 CPU
 
+# jtag speed
+jtag_khz 10, 3000
+
 #use combined on interfaces or targets that can’t set TRST/SRST separately
 #reset_config trst_and_srst srst_pulls_trst
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str912.cfg b/src/target/target/str912.cfg
index 8200c0f01c1ff89ebd21699bca41cf96205c7321..fc61bc1e5c7d7dfb89e9f076818a1da76ae5e2f6 100644
--- a/src/target/target/str912.cfg
+++ b/src/target/target/str912.cfg
@@ -1,8 +1,11 @@
+# script for str9
+
+# jtag speed
+jtag_khz 16 3000
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
-jtag_khz 16 2000
-
 #use combined on interfaces or targets that can't set TRST/SRST separately
 reset_config trst_and_srst
 
diff --git a/src/target/target/str9comstick.cfg b/src/target/target/str9comstick.cfg
index 9375b77d38f0aa4f0ff1183bc6d9a649091f85ba..71664567bf9a035bf0049f523323c8209598c92e 100644
--- a/src/target/target/str9comstick.cfg
+++ b/src/target/target/str9comstick.cfg
@@ -1,4 +1,8 @@
 #Hitex STR9 Comstick
+
+# set jtag speed
+jtag_khz 3000
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 #use combined on interfaces or targets that can’t set TRST/SRST separately