[OpenOCD-user] Error: Invalid ACK (4) in DAP response

[Ying C. 周. <yin...@su...>]

Hello Sir,
I am trying to use jlink with OpenOCD (Version 0.11.0) on my Cortex A55 based platform. The DAP information of DPIDR / APIDR / DEVICEID are 0x4c013477 / 0x24770006 / 0x4ba06477 respectively.

When I executed the attached config on my platform, I got the following error message. May I have your suggestion for its meaning ? I have googled it but can’t find any clue about it.


C:\Users\ying.chou\Downloads\openocd-20211118\OpenOCD-20211118-0.11.0\bin>openocd.exe -f interface/jlink.cfg -f target/cortex_a55.cfg
Open On-Chip Debugger 0.11.0 (2021-11-18) [https://github.com/sysprogs/openocd]
Licensed under GNU GPL v2
libusb1 09e75e98b4d9ea7909e8837b7a3f00dda4589dc3
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
Warn : Interface already configured, ignoring
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : J-Link V11 compiled Nov 16 2021 11:59:06
Info : Hardware version: 11.00
Info : VTarget = 3.386 V
Info : clock speed 1000 kHz
Info : JTAG tap: a55.tap tap/device found: 0x4ba06477 (mfg: 0x23b (ARM Ltd), part: 0xba06, ver: 0x4)
Error: Invalid ACK (4) in DAP response



Thanks,
Ying