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authorUwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>2016-02-28 19:20:43 +0100
committerAndreas Fritiofson <andreas.fritiofson@gmail.com>2016-08-13 09:26:42 +0100
commit20466e5374e563a61b3c4c859265623451be463c (patch)
tree663d6432482dcab555a2f2bb222c37ef91e882d3
parent4b115487487829759f65509b250d9ae597f6c676 (diff)
tcl/target/stm32l4x.cfg: Reduce adapter speed before reset.
Change-Id: I200286c0b980369f74e8f1e497bc5e565ddb616d Signed-off-by: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de> Reviewed-on: http://openocd.zylin.com/3366 Tested-by: jenkins Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
-rw-r--r--tcl/target/stm32l4x.cfg21
1 files changed, 13 insertions, 8 deletions
diff --git a/tcl/target/stm32l4x.cfg b/tcl/target/stm32l4x.cfg
index 65169942..dec00698 100644
--- a/tcl/target/stm32l4x.cfg
+++ b/tcl/target/stm32l4x.cfg
@@ -58,12 +58,12 @@ $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE
set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
-# JTAG speed should be <= F_CPU/6. F_CPU after reset is MSI 4MHz, so use F_JTAG = 500 kHz
+# Common knowledges tells JTAG speed should be <= F_CPU/6.
+# F_CPU after reset is MSI 4MHz, so use F_JTAG = 500 kHz to stay on
+# the safe side.
#
-# Since we may be running of an RC oscilator, we crank down the speed a
-# bit more to be on the safe side. Perhaps superstition, but if are
-# running off a crystal, we can run closer to the limit. Note
-# that there can be a pretty wide band where things are more or less stable.
+# Note that there is a pretty wide band where things are
+# more or less stable, see http://openocd.zylin.com/#/c/3366/
adapter_khz 500
adapter_nsrst_delay 100
@@ -81,14 +81,19 @@ if {![using_hla]} {
$_TARGETNAME configure -event reset-init {
# CPU comes out of reset with MSI_ON | MSI_RDY | MSI Range 6 (4 MHz).
- # Configure system to use MSI 24 MHz clock, compliant with VOS default (2).
- # 3 WS compliant with VOS=2 and 24 MHz.
- mww 0x40022000 0x00000102 ;# FLASH_ACR = PRFTBE | 3(Latency)
+ # Use MSI 24 MHz clock, compliant even with VOS == 2.
+ # 3 WS compliant with VOS == 2 and 24 MHz.
+ mww 0x40022000 0x00000103 ;# FLASH_ACR = PRFTBE | 3(Latency)
mww 0x40021000 0x00000099 ;# RCC_CR = MSI_ON | MSIRGSEL| MSI Range 10
# Boost JTAG frequency
adapter_khz 4000
}
+$_TARGETNAME configure -event reset-start {
+ # Reset clock is MSI (4 MHz)
+ adapter_khz 500
+}
+
$_TARGETNAME configure -event examine-end {
# DBGMCU_CR |= DBG_STANDBY | DBG_STOP | DBG_SLEEP
mmw 0xE0042004 0x00000007 0