两个都可以的，UART1/UART2.
至于AN2606，它在不停更新，因为STM32芯片也在不停增加新产品线及料号。
你下载个最新的，里面有介绍。
5.1 Bootloader configuration
The STM32F030xC bootloader is activated by applying pattern6 (described in Table 2: Bootloader activation patterns). The following table shows the hardware resources used by this bootloader.
Note:After the STM32F030xC devices have booted in Bootloader mode using USART2, the serial wire debug (SWD) communication is no more possible until the system is reset, because SWD uses PA14 pin (SWCLK) which is already used by the Bootloader (USART2_RX).
The system clock is derived from the embedded internal high-speed RC, no external quartz is required for the bootloader execution.
Table 8.STM32F030xC configuration in system memory boot mode
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