1：用JTAG下载程序，boot0和boot1应选择从System memory启动吗？
BOOT1 BOOT0
X 0 User Flash memory User Flash memory is selected as the boot space
0 1 System memory System memory is selected as the boot space
1 1 Embedded SRAM Embedded SRAM is selected as the boot space
到底该如何去选择？
2：串口ISP下载只能是串口1吗？串口4行不行？（非开发板，自己做的板子）
谢谢大家！

1、jtag不用控制boot脚
2、串口必须是串口1