topic Re: Tigerlake UP3 no boot up in Embedded Intel® Core™ Processors

Tigerlake UP3 no boot up

flykevin0021 — Wed, 16 Apr 2025 11:39:20 GMT

Hi Intel,

We have faced a problem during bring up in our in-house project. We use TGL-UP3 i7-1186GRE.

our bring-up board didn't work. and as we checked that the problem is that PLTRST doesn't de-asserted. When we supply power to the board, all power rails and system signals work well as we expected. but it stops after SYS-PWROK. and no pltrst go to high.

In the power sequence of PDG, the PLTRST should be de-asserted after sys-pwrok. we checked that all other system signals(all_sys_pwrgd,pch_pwrok,procpwrgd and vccst_pwrgd ) are works well.

only one suspected that VCCIO power rail is not output from PCH. the VCCIO rail is a FIVR power rail so that should be output after procpwrgd HIGH. but no output at that time.

question is.. can you explain how to controll the VCCIO power rail. what is the souce power of the VCCIO? which signal is the enable one for VCCIO?

And can you let me know any check points for this issue? if you have any errata document for board bring up issue, please share that for us.

Thank you for your support.

Kevin Kim

Re: Tigerlake UP3 no boot up

Diego_INTEL — Fri, 18 Apr 2025 22:44:01 GMT

Hello @flykevin0021,

Thank you for contacting Intel Embedded Community.

We have a Board Bring Up guide, please check the following document in RDC:

#730333 - Board Bring Up Debug Cookbook

Best regards,

@Diego_INTEL

Re: Tigerlake UP3 no boot up

flykevin0021 — Wed, 07 May 2025 12:02:39 GMT

Hi,

Thank you for reply and the guidance that is helpful to debug an issue.

Unfortunately we are still debugging the booting issue. So I'd like to get review the power-up-checklist that we measured and filed for our project. can you review the file?

As we checked, we found several problem.

1. no VCCIO power rail output : the VCCIO power is an internal power from PCH. I'm not sure what we should be checked for no VCCIO. Can you guide?

2. no PLTRST : I think this is related with no VCCIO that may affect to PLTRST deassertion.

As you see the checklist, all other power sequence are no matter beside some of power rail is a little bit low but I think that is not critical. anyway if you can review the file, that would be very helpful.

Thank you very much for your help.

Kevin Kim

Re: Tigerlake UP3 no boot up

flykevin0021 — Wed, 07 May 2025 12:08:50 GMT

file attached - TGL_UP3_Power_up_checklist

Re: Tigerlake UP3 no boot up

Diego_INTEL — Sat, 10 May 2025 01:55:32 GMT

Hello @flykevin0021,

I will check the information but I think it may be best to use the IPS support for a better support regarding this issue.

https://www.intel.com/content/www/us/en/support/articles/000057045/ethernet-products.html

Best regards,

@Diego_INTEL

Re: Tigerlake UP3 no boot up

flykevin0021 — Mon, 12 May 2025 00:46:19 GMT

Hi Diego,

Thank you for your support and I will try to submit it to the IPS support. anyway please help to review that in your side as well.

Thank you,

Kevin Kim

Re: Tigerlake UP3 no boot up

Profile_VS — Mon, 15 Dec 2025 18:06:29 GMT

Hello,

I have a similar situation in which the Tigerlake UP3 no longer fully boots.

It appears that it is unable to get out of sleep state. DS8H4 LED is on at all times. Do you have any suggestions as to why this is occurring, or what else I could try in order for it to boot . I have tried different Tigerlake IC's, so it seems this could be tied to the platform running the Tigerlake.

Re: Tigerlake UP3 no boot up

Profile_VS — Tue, 16 Dec 2025 19:11:57 GMT

For this particular case the fix was flashing the bios

Re: Tigerlake UP3 no boot up

flykevin0021 — Thu, 18 Dec 2025 08:34:35 GMT

Thank you for update. in my case, the issue was a pcb. some of cpu ball pads have problem so it made a booting fail. So this was not a cpu problem.

Re: Tigerlake UP3 no boot up

Peterpeng1 — Mon, 16 Mar 2026 06:51:30 GMT

Excuse me, I'm facing exactly the same problem as you. The PLTRST is not rising, and the VCCIO power supply is also missing. All other power supplies and signals are working fine. Could you please tell me which pin pad on the PCB is the cause of the problem? Thank you!