1、硬件中默认使用的UART0，所以应该不存在论坛里提出的使用UART1 的问题
2、直接用FSBL+PMU+Helloworld
FSBL+Helloworld
等做成BOOT.BIN均能打印helloworld
但是，加上bit文件后生成BOOT.BIN就会打印如下信息：
======= In Stage 3, Partition No:1 =======
UnEncrypted data Length: 0x153E27
Data word offset: 0x153E27
Total Data word length: 0x153E27
Destination Load Address: 0xFFFFFFFF
Execution Address: 0x0
Data word offset: 0xE970
Partition Attributes: 0x26
Destination Device is PL, changing LoadAddress
Non authenticated Bitstream download to start now
DMA transfer done
XFSBL_ERROR_BITSTREAM_LOAD_FAIL
RegVal:
Partition 1 Load Failed, 0x37
3、以下为读取的PLL_STATUS(CRF_APB)Register的返回值，
根据返回值显示Apll、DPLL、VPLL、RPLL均已锁定
0xFF5E0040 : 0x0000001B
0xFD1A0044: 0x0000003F
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4、按照ug-1209，JTAG方式启动u-boot同样会和SD卡启动uboot一致，卡在BL31信息后；================= In Stage 4 ============
AIB ack status: 0x0
AIB ack status: 0x0
PM Init Success
Protection configuration applied
ATF running on XCZU3EG/silicon v4/RTL5.1 at 0xfffea000
NOTICE: BL31: Secure code at 0x0
NOTICE: BL31: Non secure code at 0x8000000
NOTICE: BL31: START.
NOTICE: BL31: v1.4(release):xilinx-v2018.2-dirty
NOTICE: BL31: Built : 15:35:41, Feb 20 2019
NOTICE: BL31: END.
P