diff options
| author | Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de> | 2016-02-28 19:20:43 +0100 |
|---|---|---|
| committer | Andreas Fritiofson <andreas.fritiofson@gmail.com> | 2016-08-13 09:26:42 +0100 |
| commit | 20466e5374e563a61b3c4c859265623451be463c (patch) | |
| tree | 663d6432482dcab555a2f2bb222c37ef91e882d3 | |
| parent | 4b115487487829759f65509b250d9ae597f6c676 (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.cfg | 21 |
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 |