imx6 cpu tap not found in jtag chain

[alubeiro]

Hi all,

I'm trying to connect via JTAG to the MCIMX6UL-EVK with "J-link base" from Segger.

First of all i have removed R1407, R1431~R1434 because JTAG is dedicated with Audio CODEC signals. This is said in Hardware User's guide, page 14.

I have also removed R507 so the JTAG interface is configured to a mode compliant with the IEEE 1149.1 standard, (IMX6ULHDG.pdf)

So at this point, i try to connect with no success.

Please, find attached 2 screen captures. One picture with R507 placed (just in case) and another one without it.

Check this out and any help will be appreciated.

In device options, i don't see any IMX6.

Though in the screen captures is shown ARM7 as device option, i have tried with cortex-A7 with same results.

Thanks and best regards

[igorpadykov]

HI Alberto

please look at

https://community.freescale.com/docs/DOC-329192

Best regards

igor

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[dianatorres]

Hi andreaskurrle​

Please refer to this document instead:

ARM DS-5 Development Studio Debug i.MX6UL-EVK​

Best regards,

Diana Torres

[alubeiro]

Hi Igor,

I don't have the permission to get into that URL.

Could you please attach it here or send it to my mail?

Thanks and best regards

[igorpadykov]

HI Alberto

please create service request for obtaining

these documents.

Best regards

igor

[alubeiro · Accepted solution]

Hi Igor,

Finally we got it! we had removed R507 before trying with Cortex-A7,

Now our goal is to change the USB_LDO voltage by JTAG and then program the nand flash.

Is there any Aplication note or guide lines which i can follow?

I belive this post in starting to look the same as the other one i posted due to an issue with the USB.

IMX6UL USB OTG HID enumeration failure

So better we leave this here and continue in this other, are you agree?

Thanks and best regards