port-evbarm/53693: evbarm-earmv7hf panics at boots

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         53693
>Category:       port-evbarm
>Synopsis:       evbarm-earmv7hf panics at boots
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 01 09:00:00 +0000 2018
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2018.10.30.22.32.33
>Organization:

>Environment:
System: NetBSD
Architecture: arm
Machine: evbarm
>Description:

Booting NetBSD-current/evbarm-earmv7hf (VEXPRESS_A15) under qemu
panics with:

  [   1.0000000] NetBSD/evbarm (fdt) booting ...
  [   1.0000000] panic: kernel diagnostic assertion "bp_start < bp_end" failed: file "/tmp/bracket/build/2018.10.30.22.32.33-evbarm-earmv7hf/src/sys/arch/arm/arm32/arm32_boot.c", line 273
  [   1.0000000] cpu0: Begin traceback...
  [   1.0000000] 0x8153e56c: 8110fa98
  [   1.0000000] 0x8153e584: 8127a9b0
  [   1.0000000] 0x8153e59c: 8137fbc4
  [   1.0000000] 0x8153e614: 81000808
  [   1.0000000] 0x8153e7bc: 8100a734
  [   1.0000000] cpu0: End traceback...

Looks like the problem started with the following commits:

  2018.10.30.21.32.35 jmcneill src/sys/arch/evbarm/fdt/fdt_machdep.c 1.49
  2018.10.30.21.32.35 jmcneill src/sys/arch/evbarm/fdt/fdt_memory.c 1.1
  2018.10.30.21.32.35 jmcneill src/sys/arch/evbarm/fdt/fdt_memory.h 1.1
  2018.10.30.22.32.33 jmcneill src/sys/arch/evbarm/conf/files.fdt 1.5

Logs at:

  http://releng.netbsd.org/b5reports/evbarm-earmv7hf/commits-2018.10.html#2018.10.30.22.32.33

>How-To-Repeat:

>Fix: