STM32F407G-DISC1: strange clock problem

[Test User]

Hi,

We are using STM32F407G-DISC1 discovery kit with an external debugger/programmer. CN3 jumpers are off, SB11 soldier bridge is disconnected because we are using the NRST pin for JTAG. We've a simple led blinking user application based on system timer. In SW4S IDE when we start debugging the code execution is in infinite loop at SetSysClock() as shown in the following image. How to fix this problem? This problem is occured after we disconnected SB11.

[waclawek.jan]

Make sure the oscillator you've chosen as PLL input is up and running.

Make sure the parameters chosen for PLL won't violate the VCO minimum and maximum frequency.

JW