What is the difference between Board part numbers?

[TTXL3099]

I use Maple BootLoader2.0, Arduino_Core_STM32 development kit.My chip is STM32F103C8T6 (64KB)No matter which part number I choose, the other options are as shown in the picture

In the board part number in ArduinoIDE, I saw "BluePill F103C8", "Black Pill F103C8" and "Generic F103C8Tx". I tried to use the third option, and the result was that the BootLoader disappeared

Maple Serial turns into code -43 - Device Descriptor Request Failed

• I had to re-burn the BootLoader using stlink. However, when I chose the first option, everything worked fine, even on the PCB I made myself. What is the difference between these three options? ?

[fpistm]

Hi @TTXL3099
First please to open several topic/discussion for the same subject.
For ref:
https://www.stm32duino.com/viewtopic.php?t=2592

the result was that the BootLoader disappeared

No it is not disappeared. Issue is that USB COM port is not properly enumerated but the bootloader is always here. As the USB CDC is not properly init, they are no COM port and so can't reset in the BL. Anyway, if you press reset during the reset it will works (tested).

Main difference between board part number are they used different clock configuration.
Generic provide a default clock config using only internal oscillator (HSI, ...) while a dedicated variant like the BluePill provides a dedicated clock config, in this case using HSE.

You can override the default clock config of the generic and paste the one from the BluePill and it works.
I've tested the generic using the HSI and USB failed to enumerate, HSI seems not stable anyway, using the clock config from the BP (with HSE) it works and the Bootloader was never erased.