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
1 JTAG chain configuration 2 -------------------------------------------------- 3 Device ID Code IR Length Part Name 4 1 4ba00477 4 arm_dap 5 2 23727093 6 xc7z020 6 -------------------------------------------------- 7 Enabling extended memory access checks for Zynq. 8 Writes to reserved memory are not permitted and reads return 0. 9 To disable this feature, run "debugconfig -memory_access_check disable". 10 -------------------------------------------------- 11 CortexA9 Processor Configuration 12 ------------------------------------- 13 Version.............................0x00000003 14 User ID.............................0x00000000 15 No of PC Breakpoints................6 16 No of Addr/Data Watchpoints.........4 17 Processor Reset .... DONE 18 SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB 19 Performing Erase Operation... 20 Erase Operation successful. 21 INFO: [Xicom 50-44] Elapsed time = 34 sec. 22 Performing Program Operation... 23 0%.........................................................................................................................................................................................10%.........................................................................................................................................................................................20%.........................................................................................................................................................................................30%.........................................................................................................................................................................................40%.........................................................................................................................................................................................50%.........................................................................................................................................................................................60%.........................................................................................................................................................................................70%.........................................................................................................................................................................................80%.........................................................................................................................................................................................90%.........................................................................................................................................................................................100% 24 .........Program Operation successful. 25 INFO: [Xicom 50-44] Elapsed time = 494 sec. 26 Flash Operation Successful
基于Cypress方案，JTAG下载时间为674sec
1 JTAG chain configuration 2 -------------------------------------------------- 3 Device ID Code IR Length Part Name 4 1 4ba00477 4 arm_dap 5 2 23727093 6 xc7z020 6 -------------------------------------------------- 7 Enabling extended memory access checks for Zynq. 8 Writes to reserved memory are not permitted and reads return 0. 9 To disable this feature, run "debugconfig -memory_access_check disable". 10 -------------------------------------------------- 11 CortexA9 Processor Configuration 12 ------------------------------------- 13 Version.............................0x00000003 14 User ID.............................0x00000000 15 No of PC Breakpoints................6 16 No of Addr/Data Watchpoints.........4 17 Processor Reset .... DONE 18 SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB 19 Performing Erase Operation... 20 Erase Operation successful. 21 INFO: [Xicom 50-44] Elapsed time = 33 sec. 22 Performing Program Operation... 23 0%.........................................................................................................................................................................................10%.........................................................................................................................................................................................20%.........................................................................................................................................................................................30%.........................................................................................................................................................................................40%.........................................................................................................................................................................................50%.........................................................................................................................................................................................60%.........................................................................................................................................................................................70%.........................................................................................................................................................................................80%.........................................................................................................................................................................................90%............................................................................................................................................................................100% 24 ...Program Operation successful. 25 INFO: [Xicom 50-44] Elapsed time = 674 sec. 26 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
1 cmd /C program_flash -f \ 2 F:\*\bootimage\BOOT.bin \ 3 -offset 0 -flash_type qspi_single -blank_check -verify -cable type xilinx_tcf url \ 4 TCP:127.0.0.1:3121 5 ****** Xilinx Program Flash 6 ****** Program Flash v2015.4 (64-bit) 7 **** SW Build 1412921 on Wed Nov 18 09:43:45 MST 2015 8 ** Copyright 1986-2015 Xilinx, Inc. All Rights Reserved. 9 Connecting to hw_server @ TCP:127.0.0.1:3121 10 Connected to hw_server @ TCP:127.0.0.1:3121 11 Available targets and devices: 12 Target 0 : jsn-JTAG-SMT1-210203367162A 13 Device 0: jsn-JTAG-SMT1-210203367162A-4ba00477-0 14 JTAG chain configuration 15 -------------------------------------------------- 16 Device ID Code IR Length Part Name 17 1 4ba00477 4 arm_dap 18 2 23727093 6 xc7z020 19 -------------------------------------------------- 20 Enabling extended memory access checks for Zynq. 21 Writes to reserved memory are not permitted and reads return 0. 22 To disable this feature, run "debugconfig -memory_access_check disable". 23 -------------------------------------------------- 24 CortexA9 Processor Configuration 25 ------------------------------------- 26 Version.............................0x00000003 27 User ID.............................0x00000000 28 No of PC Breakpoints................6 29 No of Addr/Data Watchpoints.........4 30 Processor Reset .... DONE 31 SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB 32 Performing Erase Operation... 33 Erase Operation successful. 34 INFO: [Xicom 50-44] Elapsed time = 33 sec. 35 Performing Blank Check Operation... 36 0%.......................................................................................................................................................................................................10%.......................................................................................................................................................................................................20%.......................................................................................................................................................................................................30%.......................................................................................................................................................................................................40%.......................................................................................................................................................................................................50%.......................................................................................................................................................................................................60%.......................................................................................................................................................................................................70%.......................................................................................................................................................................................................80%.......................................................................................................................................................................................................90%.......................................................................................................................................................................................................100% 37 ..........INFO: [Xicom 50-44] Elapsed time = 524 sec. 38 Blank Check Operation successful. The part is blank. 39 Performing Program Operation... 40 0%.........................................................................................................................................................................................10%.........................................................................................................................................................................................20%.........................................................................................................................................................................................30%.........................................................................................................................................................................................40%.........................................................................................................................................................................................50%.........................................................................................................................................................................................60%.........................................................................................................................................................................................70%.........................................................................................................................................................................................80%.........................................................................................................................................................................................90%.........................................................................................................................................................................................100% 41 .........Program Operation successful. 42 INFO: [Xicom 50-44] Elapsed time = 420 sec. 43 Performing Verify Operation... 44 0%.......................................................................................................................................................................................................10%.......................................................................................................................................................................................................20%.......................................................................................................................................................................................................30%.......................................................................................................................................................................................................40%.......................................................................................................................................................................................................50%.......................................................................................................................................................................................................60%.......................................................................................................................................................................................................70%.......................................................................................................................................................................................................80%.......................................................................................................................................................................................................90%.......................................................................................................................................................................................................100% 45 ..........INFO: [Xicom 50-44] Elapsed time = 511 sec. 46 Verify Operation successful. 47 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。
转载于:https://www.cnblogs.com/ifpga/p/8127583.html
相关资源：FT2232芯片说明（usb转JTAG）