Disable serial download, JTAG download and serial logs on i.MX8MQ

[meetalipatel]

Hi NXP Team,

We are using i.MX8MQ processor in our project and we have a requirement of performing the following things:

1. Disable USB serial downloading
2. Disable JTAG downloading
3. Disable serial console logs

I wanted to know if the above-mentioned things are possible on i.MX8MQ processor? If yes, can you please help me out with the steps for the same?

Thanks in advance.

Regards

Meetali Patel

[igorpadykov · Accepted solution]

Hi Meetali

for 1,2 one can refer to SDP_DISABLE fuse in Table 6-40. Boot Fusemap, also

additional info was sent via mail

i.MX 8M Dual/8M QuadLite/8M Quad Applications Processors Reference Manual

for 3. one can look at

https://stackoverflow.com/questions/57671588/disabling-uart-debug-serial-port-on-linux

Best regards
igor

[meetalipatel]

Hi @igorpadykov ,

I tried fusing the SJC_DISABLE register but still, I am able to detect my device using the JTAG interface. Is this an expected behavior? I used the following command at u-boot to fuse this register:

$ fuse prog 1 3 0x200000

Also, I have not yet fused SDP_DISABLE register but I am not able to detect the device from the UUU tool.

Can you please share some more detailed information about the SDP_DISABLE and SJC_DISABLE fuse registers?

Thanks & Regards

Meetali Patel

[meetalipatel]

Hi @igorpadykov,

I am now able to disable serial download and JTAG using the steps mentioned.

Thanks for the support.

Regards

Meetali Patel