iMX6 JTAG and eFuse

[hemanthkumarven]

We are using a customized board based on imx6q sabre lite board. We are not able to access the board via JTAG. When we plug the board via USB cable to PC. We see the device enumerated as HID device. We would like to know

1. what are the efuses set in the factory and what efuses have to be set by the user?

2. Is there any way to read the efuse status without using JTAG?

[hemanthkumarven]

Hi Igor,

Thanks for the reply. In our Custom board, we have the JTAG_MOD left unconnected.

We think that could be the issue why we are not able to access the board via JTAG.

Thanks

Hemanth

[igorpadykov · Accepted solution]

Hi Hemanth

recommended to check  Chapter 7Configuring JTAG Tools IMX6DQ6SDLHDG   and link below

J-Link and iMX6

Default fuse state is given in Table 8-2 IMX6DQRM

they can be read with SDK (test ocotp_test.c)

i.MX 6Series Platform SDK or with Uboot

https://community.freescale.com/docs/DOC-95458

Note: JTAG_MOD is high only in boundary scan. For normal operation JTAG_MOD should be low.

Best regards

igor

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