Excute from chapter 7 to chapter 7.3 in the document of ''CodeWarrior Development Studio for QorIQ LS series - ARM V8 ISA, Targeting Manual '', an error was reported. The specific contents of the error are as follows:
(gdb) source ../../gdb_extensions/flash/cwflash.py
Starting flash programmer services...
Starting local server...
Successfully started gdb server 127.0.0.1:45000.
Set gdb remote timeout to 120
Connecting to target...
Using LS1012A SoC
Using CWTAP connected to local usb port
Using jtag speed 16000
Connecting to probe...
Successfully connected to probe
Running init script c:\freescale\cw4net_v2019.01\cw_armv8\armv8\gdb_extensions\flash\scripts/../../../../Config/boards/LS1012A_QDS_init.py
PBL phase completed with error 'No preamble is detected'
Error: fail to initialize target
Closing debugger server...
Error: fail to start flash programming services.
Please help to analyze how to solve it.