I'm using the stm32f407i . BOOT0-tied to GND by 1k resistor, BOOT1 tied to VDD by an 24k resistor NRST connected by a 100nF capacitor to GND,PDR_ON is floating.
We assembled several cards: part of it operates well ,while part is not wakeup - no commination to the debugger (ST-LINK/V2 with IAR SW).
I'm not sure that leaving PDR_ON floating is OK, and didn't find a clear instruction.
Any help will be appreciated.