Intel® NUCs
Support for Intel® NUC products
12536 Discussions

NUC8v7PNH: serial output with latest firmware 046/047 contains UEFI debug output

hpvzr
Beginner
473 Views
Hello, After I've updated NUC's firmware from 043 to 047 and the serial port now flooded with debug output from UEFI/EC (see below). The serial port becomes unusable and also it seems to be impossible to downgrade to version 043. Any chance to have a quirk to make the downgrade possible or may be a new version without UEFI debug output? Or may be there is a UEFI variable to stop debug output? P.S. I've removed BIOS security jumper and tried all possible ways to downgrade firmware to 040/043: power button menu, recovery, Windows, UEFI shell and F7. Nothing works except I was able to go from 047 to 046 and still the serial port is flooded with UEFI debug output 903:SysPowState: 903:SysPowState:x81->x01 905:PWtime: 1 1448:HPD_1OutIn:x01,x01 1449:HPD_2OutIn:x01,x00 Mbox:x89,x85 1215:tmp,ver2,x01,x35 339:IT8566_FWVer1,2:x02,x35 344:8566 385:IT8566_FWVer1,2:x02,x35\ 1a 01 cc d1 01 cc] Mbox:x16,x85 Mbox:x1A,x01 Mbox:x15,x7F Mbox:x06,x7F 2a 00 00 00 00 cc] Mbox:x1D,x00 191:Persistent_Port1HPD:x00 198:DisplayEmuMode->new:x00,x00 221:Persistent_GetInfo,BRAM[0x12]:x00,x66_\ 1448:HPD_1OutIn:x00,x00 1449:HPD_2OutIn:x01,x00_ 1448:HPD_1OutIn:x01,x01 1449:HPD_2OutIn:x01,x00 11 d3 d3] \ Mbox:x01,x00 Mbox:x18,x00 _\_ Mbox:x88,x00 1215:tmp,ver2,x01,x35\ 720:hpd1 _LOW 1448:HPD_1OutIn:x00,x01 1449:HPD_2OutIn:x01,x00_ 1448:HPD_1OutIn:x01,x01 1449:HPD_2OutIn:x00,x00 a2 a1 01 1a a2 cc] 72 00 cc 72 01 cc] \ 72 20 ff 00 00 cc] 72 30 cc] _\_\_\_\ 10 d3 d3]
0 Kudos
8 Replies
hpvzr
Beginner
460 Views
Sorry, text formatting appears to be broken.
 
After I've updated NUC's firmware from 043 to 047 and the serial port now flooded with debug output from UEFI/EC (see below).
 
The serial port becomes unusable and also it seems to be impossible to downgrade to version 043. Any chance to have a quirk to make the downgrade possible or may be a new version without UEFI debug output? Or may be there is a UEFI variable to stop debug output?
 
P.S. I've removed BIOS security jumper and tried all possible ways to downgrade firmware to 040/043: power button menu, recovery, Windows, UEFI shell and F7. Nothing works except I was able to go from 047 to 046 and still the serial port is flooded with UEFI debug output.
 
Serial debug output:
 

903:SysPowState:

903:SysPowState:x81->x01

905:PWtime: 1

1448:HPD_1OutIn:x01,x01

1449:HPD_2OutIn:x01,x00

Mbox:x89,x85

1215:tmp,ver2,x01,x35

339:IT8566_FWVer1,2:x02,x35

344:8566

385:IT8566_FWVer1,2:x02,x35\

<EC 06> 1a 01 cc d1 01 cc]

Mbox:x16,x85

Mbox:x1A,x01

Mbox:x15,x7F

Mbox:x06,x7F

<EC 06> 2a 00 00 00 00 cc]

Mbox:x1D,x00

191:Persistent_Port1HPD:x00

198:DisplayEmuMode->new:x00,x00

221:Persistent_GetInfo,BRAM[0x12]:x00,x66_\

1448:HPD_1OutIn:x00,x00

1449:HPD_2OutIn:x01,x00_

1448:HPD_1OutIn:x01,x01

1449:HPD_2OutIn:x01,x00

<EC 03> 11 d3 d3] \

Mbox:x01,x00

Mbox:x18,x00 _\_

Mbox:x88,x00

1215:tmp,ver2,x01,x35\

720:hpd1 _LOW

1448:HPD_1OutIn:x00,x01

1449:HPD_2OutIn:x01,x00_

1448:HPD_1OutIn:x01,x01

1449:HPD_2OutIn:x00,x00

<EC 06> a2 a1 01 1a a2 cc]

<EC 06> 72 00 cc 72 01 cc] \

<EC 06> 72 20 ff 00 00 cc]

<EC 03> 72 30 cc] _\_\_\_\

<EC 03> 10 d3 d3]

AndrewG_Intel
Moderator
430 Views

Hello @hpvzr

Thank you for your response.


In order to review this further, could you please provide us with the following details?

1- Just to make sure, how and where did you get/see the Serial debug output information from? Please provide details:

2- When you said "the serial port becomes unusable", what is the exact behavior?

Do you have a Serial Port adapter connected to the NUC's internal Serial Port Header? Is it having issues establishing a connection, recognizing devices, or is it having drop connections, etc? Please provide details:


3- Run the Intel® System Support Utility (Intel® SSU) to gather more details about the system:

  • Download the Intel® SSU and save the application on your computer
  • Open the application, check the "Everything" checkbox, and click "Scan" to see the system and device information. The Intel® SSU defaults to the "Summary View" on the output screen following the scan. Click the menu where it says "Summary" to change to "Detailed View".
  • To save your scan, click Next and click Save.
  • Once you have saved the file (.txt file), please attach it to your reply.

To upload and attach a file, use the "Drag and drop here or browse files to attach" option below the response textbox.


Best regards,

Andrew G.

Intel Customer Support Technician


hpvzr
Beginner
394 Views

Hello @AndrewG_Intel 

 

here are requested details:

1. I'm observing the debug output (from BIOS/firmware/EC and etc) from a serial connection to UART/RS232/serial/0x3f8 via putty/minicom/picocom. The serial port is connected via USB/TTL converter to another PC. It even stays when I shutdown Linux/Windows (which makes sense because EC/ME are still powered on) and also proof it is not an OS output.

2. This debug output is flooding serial and even doing impossible to enter/send anything to NUC. For example it's impossible to use the linux getty/console after the NUC firmware update (i.e. "console=ttyS0" as kernel boot parameter)

3. see attached info

hpvzr
Beginner
393 Views

@AndrewG_Intel ,

just would like to add my explanation:

It looks like the BIOS team accidentally uploaded the DEBUG build of UEFI firmware. It could be easily fixed by either re-uploading RELEASE build or producing a new version (just to make sure there is a RELEASE build)

AndrewG_Intel
Moderator
331 Views

Hello hpvzr

Thank you for your response and for all the details.

Please allow us to review this further and we will be posting back in the thread as soon as more information is available.


Best regards,

Andrew G.

Intel Customer Support Technician


AndrewG_Intel
Moderator
243 Views

Hello hpvzr

Thank you for your patience in this matter.


After reviewing this further, we would like to inform you that this issue will be fixed in the next BIOS release (target date is end of July but dates may shift). In the meantime, we will send you an email to the email address associated with your profile to provide you with some steps for testing purposes.


Best regards,

Andrew G.

Intel Customer Support Technician


AndrewG_Intel
Moderator
228 Views

Hello hpvzr

We are checking this thread and we would like to know if you were able to review the email we sent you on June 6th. Please do not hesitate to contact us back if you have additional inquiries.


Best regards,

Andrew G.

Intel Customer Support Technician


AndrewG_Intel
Moderator
207 Views

Hello hpvzr

We have not heard back from you so we will proceed to close this thread now. If you need any additional information, please submit a new question as this thread will no longer be monitored.


It has been a pleasure to assist you.

Best regards,

Andrew G.

Intel Customer Support Technician


Reply