kern/55982: kernel crash booting Dell T430 with Radeon video card

[htodd%twofifty.com@localhost]

>Number:         55982
>Category:       kern
>Synopsis:       Subject: kernel crash booting Dell T430 with Radeon video card
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 08 19:50:00 +0000 2021
>Originator:     Hisashi Todd Fujinaka <htodd%twofifty.com@localhost>
>Release:        NetBSD 9.99.80
>Organization:
None
>Environment:
	
	
System: NetBSD mara.i8u.org 9.99.80 NetBSD 9.99.80 (MARA) #2879: Sun Feb 7 13:07:08 PST 2021 htodd%mara.i8u.org@localhost:/usr/obj/amd64/sys/arch/amd64/compile/MARA amd64
Architecture: x86_64
Machine: amd64
>Description:
I have a Dell T430 that has internal video and I added a ATI video card. With both video cards enabled,
I get a crash in radeon_bios.c:724 ... Unable to locate a BIOS ROM. Screenshot of crash is at
https://www.i8u.org/~htodd/radeon-crash.png
or
https://www.i8u.org/~htodd/radeon-crash.jpg


If I turn off the internal video, I get an NMI after "pci1 at ppb0 bus 2". Screenshot of crash is at
https://www.i8u.org/~htodd/crash.png
or
https://www.i8u.org/~htodd/crash.jpg

I've been asked to see if I can access the BIOS using dd, but I'm not sure what address to dd from.

	
>How-To-Repeat:
Boot with GENERIC (or my custom kernel with DRMKMS Radeon enabled).
	
>Fix:
Yes please.
	

>Unformatted: