I am developing a bootloader that is entirely executed from RAM. If I run the code from a Nuceleo board the MCU is supplied with 3.3V, program executed fine. If i go to target hardware (which runs on 2.5V!!), the cycle speed is reduced by ~14%. (Program run always on external quartz and PLL). Anyhow Peripheral speed is corrects, so clock speed should also be fine. Is there a voltage dependence of the RAM executed code (0x20000000) on the STM32F4?
