STM32f103 In the design guide it recommends to have something switching between vcc and gnd with 10kOhm series resistor, and i need my design to be grounded by default so i may not solder the header even, is it okay if i left the design like fig 1 instead of fig 2, and would it cause issues if i needed to pull it high?
The pull-up resistor has the advantage of allowing you to set the pin in question to a different level directly at the pin without creating a short-cut. If you are absolutely certain that you never want to switch the pin, you can also connect it directly to a fixed potential (e.g. GND for the BOOT pins) without a pull-up resistor. You can also omit the pull-up resistor if you use a switch/jumper.
To minimise board space, I've always just used a single pull down resistor (no series resistor) with a test point/contact (close to the micro) I can use to pull Boot0 high if required. I think it is a safer design to always have a pull down resistor. I personally would never connect Boot0 directly to ground, sometimes you need to pull Boot0 high to revive a stuck chip.
