Changeing clock to get higher adapter_khz

Development Boards MicroMod
1

Hi,

I am developing on stm32103/7 controllers.

I would love to initialize the clock/pll of the controller over openocd to achive higher jtag speeds than 8MHz/6 and get much higher download speeds this way.

Sounds simple, but i really got no clue how to do it.

Any help would be nice.

2

It seems nobody is interested in more speed?

What I got: Its for an STM32F1 with 20kB RAM.

source [find interface/jlink.cfg]

set WORKAREASIZE 0x5000
source [find target/stm32f1x.cfg]

uplevel #0 [list source [find chip/st/stm32/stm32.tcl]]

$_TARGETNAME configure -event reset-init { reset_init }
$_TARGETNAME configure -event gdb-detach { shutdown }

proc reset_init { } {
	echo "reset-init..."
	global RCC_CR
	global FLASH_R_BASE
	global RCC_CFGR
	# HSE on
	memwrite32 $RCC_CR [expr [memread32 $RCC_CR] | 0x00010000]
	sleep 100
	# Flash prefetch & two waits
	memwrite32 $FLASH_R_BASE [expr [memread32 $FLASH_R_BASE] | 0x00000010]
	memwrite32 $FLASH_R_BASE [expr [memread32 $FLASH_R_BASE] & 0xFFFFFFFC]
	memwrite32 $FLASH_R_BASE [expr [memread32 $FLASH_R_BASE] | 0x00000002]
	# PCLK1
	memwrite32 $RCC_CFGR [expr [memread32 $RCC_CFGR] | 0x00000400]
	# HSE * 9 = 8 * 9 = 72
	memwrite32 $RCC_CFGR [expr [memread32 $RCC_CFGR] & 0xFFC0FFFF]
	memwrite32 $RCC_CFGR [expr [memread32 $RCC_CFGR] | 0x001D0000]
	# PLL on
	memwrite32 $RCC_CR [expr [memread32 $RCC_CR] | 0x01000000]
	sleep 100
	# PLL select
	memwrite32 $RCC_CFGR [expr [memread32 $RCC_CFGR] & 0xFFFFFFFC]
	memwrite32 $RCC_CFGR [expr [memread32 $RCC_CFGR] | 0x00000002]
	sleep 100
	# Max 72000/6 = 12000
	# 10000 works most of the time
	adapter_khz 10000
	sleep 100
}

init
reset init

As you see i try to config the FLASH and PLL.

The Flash is erased in eclipse hardware debug with “monitor stm32f1x mass_erase 0” and the .elf is loaded via the eclipse hardware debug.

“Most” of the times it works. But not alway. And if it doesnt, the device gets “bricked” in a way that i need to retry often with low speed (reset-init event commented out).

The J-Link should work up to 12000kHz from what i read on the Segger website. Even 6000kHz is not stable.

Any clues?