kern/57154: CPU N3150 panics with DRMkms related function

[mef%netbsd.org@localhost]

>Number:         57154
>Category:       kern
>Synopsis:       CPU N3150 panics with DRMkms related function
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 03 12:30:01 +0000 2023
>Originator:     Makoto Fujiwara
>Release:        NetBSD 10.99.2
>Organization:
ki.nu
>Environment:
        
        

Architecture: x86_64
Machine: amd64
>Description:
      Recent DRMkms have problem with Intel N3150 embedded graphic controller.
      It seems to me it panics at graphic driver attach
      info is written at
         http://www.ki.nu/~makoto/diary/2022/12/20/#202212201
      Also debug print is listed at
         http://www.ki.nu/~makoto/diary/attach/2023/10.99.2-N3150-debug-print
      with 
         __drm_debug = 4;
      at 
         sys/external/bsd/drm2/dist/drm/drm_print.c
>How-To-Repeat:
     - Have Intel N3150 CPU mother board
     - Try boot from install media (I'm using following file for example)
          zcat NetBSD-10.0_BETA-amd64-bios-install.img.gz | sudo dd of=/dev/sd0d bs=2m
          
     - It'll be nice to connect serial console and at booting,
       interrupt by space key and select
           Drop to boot prompt 
       and type
           consdev com0     
       Then you will see the output at serial console, then
           boot netbsd
       and you may record the lines
>Fix:
     Unknown    

>Unformatted: