先来看不同JTAG方案，下载配置QSPI Flash所耗时间
基于FTDI方案，JTAG下载时间为494sec
JTAG chain configuration
--------------------------------------------------
Device ID Code IR Length Part Name
4ba00477 arm_dap
xc7z020
--------------------------------------------------
Enabling extended memory access checks for Zynq.
Writes to reserved memory are not permitted and reads return .
To disable this feature, run "debugconfig -memory_access_check disable".
--------------------------------------------------
CortexA9 Processor Configuration
-------------------------------------
Version.............................0x00000003
User ID.............................0x00000000
No of PC Breakpoints................
No of Addr/Data Watchpoints.........
Processor Reset .... DONE
SF: Detected S25FL256S_64K with page size Bytes, erase size KiB, total MiB
Performing Erase Operation...
Erase Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Performing Program Operation...
%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%
.........Program Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Flash Operation Successful
基于Cypress方案，JTAG下载时间为674sec
JTAG chain configuration
--------------------------------------------------
Device ID Code IR Length Part Name
4ba00477 arm_dap
xc7z020
--------------------------------------------------
Enabling extended memory access checks for Zynq.
Writes to reserved memory are not permitted and reads return .
To disable this feature, run "debugconfig -memory_access_check disable".
--------------------------------------------------
CortexA9 Processor Configuration
-------------------------------------
Version.............................0x00000003
User ID.............................0x00000000
No of PC Breakpoints................
No of Addr/Data Watchpoints.........
Processor Reset .... DONE
SF: Detected S25FL256S_64K with page size Bytes, erase size KiB, total MiB
Performing Erase Operation...
Erase Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Performing Program Operation...
%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%............................................................................................................................................................................%
...Program Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Flash Operation Successful
详细的烧写过程：FTDI方案，TotalTime=1455sec，24.25分钟；采用Cypress方案需要42分钟
cmd /C program_flash -f \
F:\*\bootimage\BOOT.bin \
-offset -flash_type qspi_single -blank_check -verify -cable type xilinx_tcf url \
TCP:127.0.0.1:
****** Xilinx Program Flash
****** Program Flash v2015. (-bit)
**** SW Build on Wed Nov :: MST
** Copyright - Xilinx, Inc. All Rights Reserved.
Connecting to hw_server @ TCP:127.0.0.1:
Connected to hw_server @ TCP:127.0.0.1:
Available targets and devices:
Target : jsn-JTAG-SMT1-210203367162A
Device : jsn-JTAG-SMT1-210203367162A-4ba00477-
JTAG chain configuration
--------------------------------------------------
Device ID Code IR Length Part Name
4ba00477 arm_dap
xc7z020
--------------------------------------------------
Enabling extended memory access checks for Zynq.
Writes to reserved memory are not permitted and reads return .
To disable this feature, run "debugconfig -memory_access_check disable".
--------------------------------------------------
CortexA9 Processor Configuration
-------------------------------------
Version.............................0x00000003
User ID.............................0x00000000
No of PC Breakpoints................
No of Addr/Data Watchpoints.........
Processor Reset .... DONE
SF: Detected S25FL256S_64K with page size Bytes, erase size KiB, total MiB
Performing Erase Operation...
Erase Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Performing Blank Check Operation...
%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%
..........INFO: [Xicom -] Elapsed time = sec.
Blank Check Operation successful. The part is blank.
Performing Program Operation...
%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%
.........Program Operation successful.
INFO: [Xicom -] Elapsed time = sec.
Performing Verify Operation...
%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%
..........INFO: [Xicom -] Elapsed time = sec.
Verify Operation successful.
Flash Operation Successful
在实际调试过程中，下载速度快也能为开发人员节约时间
基于此，根据相关资料DIY一个JTAG+UART方案，在调试zynq时，很多时候板级并没有UART 外置PHY，JTAG工具链自带UART，也方便FPGA和嵌入式工程师调试单板和系统。