port-evbarm/56076: Recent evbarm doesn't boot on RPI 3 model A+ (interrupt issues?)

[yamt9999%gmail.com@localhost]

>Number:         56076
>Category:       port-evbarm
>Synopsis:       Recent evbarm doesn't boot on RPI 3 model A+ (interrupt issues?)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 27 07:25:00 +0000 2021
>Originator:     YAMAMOTO Takashi
>Release:        see the description
>Organization:
>Environment:
>Description:
the recent current kernel after sys/arch/arm/pic/pic_splfuncs.c rev.1.16
doesn't boot on RPI 3 model A+.
it hangs during boot. the last message before the hang was about bwfm0.

i tried the latest current as of today. but it didn't work either.
the symptom was the same.

my kernel config:

include arch/evbarm/conf/GENERIC
makeoptions DEBUG="-g"
no options INET6
options DEBUG
options DIAGNOSTIC
options LOCKDEBUG
options MBUFTRACE
options INSECURE
no options MULTIPROCESSOR

>How-To-Repeat:
see the description
>Fix: