Board bringup JTAG issue in imx6 solo

Bitesh — Wed, 16 Aug 2023 17:28:23 GMT

Hi,

We are using i.MX6 solo processor (MCIMX6S5EVM10AD ) and designing a custom board.

We are observing that it is detecting JTAG in only reserved mode and not in any other mode.

I'm using Jlink Sagger Base debugger.

I have attached the log of eclipse for reserved mode and serial mode.

*******************

RESERVED MODE -

SEGGER J-Link GDB Server V7.90 Command Line Version

JLinkARM.dll V7.90 (DLL compiled Aug 2 2023 15:23:50)

Command line: -if jtag -device MCIMX6S5 -endian little -speed auto -port 2331 -swoport 2332 -telnetport 2333 -vd -noreset -noir -localhostonly 1
-----GDB Server start settings-----
GDBInit file: none
GDB Server Listening port: 2331
SWO raw output listening port: 2332
Terminal I/O port: 2333
Accept remote connection: localhost only
Generate logfile: off
Verify download: on
Init regs on start: off
Silent mode: off
Single run mode: off
Target connection timeout: 0 ms
------J-Link related settings------
J-Link Host interface: USB
J-Link script: none
J-Link settings file: none
------Target related settings------
Target device: MCIMX6S5
Target device parameters: none
Target interface: JTAG
Target interface speed: auto
Target endian: little

J-Link found 3 JTAG devices, Total IRLen = 13
JTAG ID: 0x4BA00477 (Cortex-A9)
Halting core...
Connected to target
Waiting for GDB connection...Restoring target state and closing J-Link connection...
Shutting down...

**********************

SERIAL MODE -

Could not connect to target.
Please check power, connection and settings.SEGGER J-Link GDB Server V7.90 Command Line Version

JLinkARM.dll V7.90 (DLL compiled Aug 2 2023 15:23:50)

Connecting to J-Link...
J-Link is connected.
Firmware: J-Link V10 compiled Jan 30 2023 11:28:07
Hardware: V10.10
S/N: 50115920
Feature(s): GDB
Checking target voltage...
Target voltage: 3.31 V
Listening on TCP/IP port 2331
Connecting to target...
ERROR: Could not connect to target.
Target connection failed. GDBServer will be closed...Restoring target state and closing J-Link connection...
Shutting down...

***********

PMIC part number used is MMPF0100NPAEP. It is programmed using the programmer to following settings.

In the design following rails are used

Voltage	Rail name	sequence	Source
3	vddsnvs	1	PMIC SNVS
1.375	vddarm	2	sw1
1.375	vddsoc	2	sw2
1.5	VDDR_1V5	3	SW3
3	VDDHIGH_IN	3	SW4
3.3	NVCC	4	external buck regulator

On our board we have verified same using oscilloscope

We have done voltage measurement of decaps near processor and results are following

Rail name	Voltage
VDDARM	1.375
VDDSOC	1.376
VDDSOC_CAP	1.122
VDDPU_CAP	1.12
VDDHIGH_CAP	2.529
VDDHIGH_IN	2.971
VDDARM_CAP	1.122
VDD_SNVS_IN	2.995
VDD_SNVS_CAP	1.993
NVCC_DRAM	1.495
NVCC_GPIO	3.302
NVCC_JTAG	3.302

Please let me know if you find any value problematic in above table or any other idea on how to solve the issue.

As JTAG is detecting the target in reserved mode we think hardware should be ok and processor samples may have some problem.

Kindly help me to resolve this issue.

Regards

Re: Board bringup JTAG issue in imx6 solo

Bitesh — Thu, 17 Aug 2023 04:15:58 GMT

@riteshmpatel Can you please help on this ?

Re: Board bringup JTAG issue in imx6 solo

Zhiming_Liu — Mon, 21 Aug 2023 04:40:38 GMT

Hi @Bitesh

Please check jtag timing refer this :

https://wiki.segger.com/J-Link_cannot_connect_to_the_CPU

4.11.16 SCAN JTAG Controller (SJC) Timing Parameters:

https://www.nxp.com/docs/en/data-sheet/IMX6SDLIEC.pdf

Best Regards

Zhiming

Re: Board bringup JTAG issue in imx6 solo

Bitesh — Mon, 21 Aug 2023 05:01:09 GMT

@Zhiming_Liu

I have not checked JTAG parameters. But will it be a problem as in reserved mode Cortex A9 is getting detected and issue is only in Serial mode.

Can you suggest what should be the next step in bringup ?

Regards,

Bitesh

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