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tcl/target/stm32f4: fix: reduce adapter speed before reset 

The reset-init hook for this target speeds up the CPU clock and JTAG adapter
speed. When the target is reset running with high adapter speed, a series of
warnings "DAP transaction stalled (WAIT) - slowing down" will be generated
since the adapter speed is not reduced to fit the slower CPU speed.
Fix: reduction of the adapter speed before a reset is performed.

Change-Id: Iabfc8e3f70311e0e71c8eed09b8a37fcbed9c58d
Signed-off-by: Alexander Kurz <akurz@blala.de>
Reviewed-on: http://openocd.zylin.com/3365
Tested-by: jenkins
Reviewed-by: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
This commit is contained in:
Alexander Kurz 2016-02-28 12:36:19 +01:00 committed by Andreas Fritiofson
parent ba7b6ddea4
commit 4d68bd1ebf
1 changed files with 5 additions and 0 deletions
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5
tcl/target/stm32f4x.cfg
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@ -120,3 +120,8 @@ $_TARGETNAME configure -event reset-init {
# Boost JTAG frequency
adapter_khz 8000
}
$_TARGETNAME configure -event reset-start {
# Reduce speed since CPU speed will slow down to 16MHz with the reset
adapter_khz 2000
}