uboot的配置：#define CONFIG_SYS_TEXT_BASE 0x23E00000
将minitool中的ram address设置为0x23E00000 (裸机，download ram and run)
下载运行后，串口显示
USB Mode: Waiting...
USB Mode: Connected
Downloading User-Bin...
Downloading User-Bin succeed
Run UserBin
OK
然后串口没有反应，请问该如何才能让uboot在内存中运行
