kern/52259: NetBSD-current won't boot on i386 or amd64 unless athn is disabled.

[mueller6725%twc.com@localhost]

>Number:         52259
>Category:       kern
>Synopsis:       NetBSD-current won't boot on i386 or amd64 unless athn is disabled.
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 28 22:25:00 +0000 2017
>Originator:     Thomas Mueller
>Release:        7.99.71 and 7.99.72
>Organization:
Home user
>Environment:
NetBSD amelia2 7.99.15 NetBSD 7.99.15 (NetBSD-HEAD amd64.nb799-20150504) #1: Tue May  5 00:12:35 UTC 2015  root@amelia2:/BETA1/netbsd-HEAD/usr/obj/BETA1/netbsd-HEAD/usr/src/sys/arch/amd64/compile/SANDY7-DRMKMS amd64

>Description:
This computer has motherboard MSI Z77 MPOWER with onboard quasi-USB wi-fi as well as Realtek 8111E/8168 Ethernet adapter.  Trying to boot generic kernel, amd64 or i386, immediately reboots with no messages.  Booting custom kernel hangs unless I go into userconf and disable athn, or build kernel with athn commented out.  I am in 7.99.15 amd64 now with Firefox as I type this.  I suspect this problem might have begun with the latest update to the if_athn_* files 

-rw-r--r--  1 root  wheel  77227 Feb  4 07:57 /BETA1/netbsd-HEAD/usr/src/sys/dev/usb/if_athn_usb.c
-rw-r--r--  1 root  wheel  12867 Feb  4 07:57 /BETA1/netbsd-HEAD/usr/src/sys/dev/usb/if_athn_usb.h

where the head of the src tree is at /BETA1/netbsd-HEAD/usr/src , /BETA1 being a mount point for a partition where FreeBSD is installed.

Even before this update, most of the time, athn firmware fails to load, though occasionally it succeeds:

athn0: could not load firmware (35)

>How-To-Repeat:
Attempt to boot NetBSD-current 7.99.71 or 7.99.72 with GENERIC (immediate reboot) or custom kernel with athn not disabled, or commented out in kernel config file.
>Fix:
None that I know of.  I can connect to Internet with onboard re0 Ethernet, otherwise the problem would be critical.