adapter_khz     1000
interface ftdi
ftdi_device_desc "Digilent USB Device"
ftdi_vid_pid 0x0403 0x6014
ftdi_channel 0
ftdi_layout_init 0x00e8 0x60eb
reset_config none
set _CHIPNAME riscv
jtag newtap $_CHIPNAME cpu -irlen 5
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME riscv -chain-position $_TARGETNAME -coreid 0
gdb_report_data_abort enable
gdb_report_register_access_error enable
riscv set_reset_timeout_sec 120
riscv set_command_timeout_sec 120
riscv set_prefer_sba off
init
halt
echo "Ready for Remote Connections"

openocd -f debug.cfg

Open On-Chip Debugger 0.10.0+dev-00195-g933cb87 (2020-06-15-20:32)
Licensed under GNU GPL v2
For bug reports, read
    http://openocd.org/doc/doxygen/bugs.html
adapter speed: 1000 kHz
Info : auto-selecting first available session transport "jtag". To override use 'transport select '.
Info : clock speed 1000 kHz
Info : TAP riscv.cpu does not have IDCODE
Info : datacount=2 progbufsize=8
Info : Examined RISC-V core; found 1 harts
Info :  hart 0: XLEN=64, misa=0x8000000000141105
Info : Listening on port 3333 for gdb connections
Ready for Remote Connections
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections

openocd -f debug.cfg

target remote localhost:3333                        ## 连接调试设备
file /folder/filename                               ## gdb打开要加载的sd卡内容
load                                                ## 把Linux镜像加load进ddr中
layout asm                                          ## gdb终端中显示汇源源码
set $pc=0x10ac8                                     ## 把pc指针设到需要加载linux设备树的地址
si                                                  ## 单步执行
b boot_other_hart                                   ## 在boot_other_hart语句出设置断点
c                                                   ## 全速执行，一直执行到断点处
restore /folder/filename.dtb binary 0x81200000      ## 加载设备树文件
c

riscv64-unknown-elf-gdb -x /folder/gdbinit