Upstream has a fix like the one I was hinting at in comment #9, I'll SRU
this fix.

commit e12ec26e19e02281d3e7258c3aabb88a5cf5ec1d
Author: Jean Delvare <jdelv...@suse.de>
Date:   Mon Aug 26 14:20:15 2019 +0200

    dmidecode: Only scan /dev/mem for entry point on x86

    x86 is the only architecture which can have a DMI entry point scanned
    from /dev/mem. Do not attempt it on other architectures, because not
    only it can't work, but it can even cause the system to reboot.

    This fixes support request #109697:
    https://savannah.nongnu.org/support/?109697


** Changed in: dmidecode (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Changed in: dmidecode (Ubuntu)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1858615

Title:
  dmidecode triggers system reboot on Inforce 6640

Status in cloud-init:
  Invalid
Status in dmidecode package in Ubuntu:
  In Progress

Bug description:
  Device: Inforce 6640
  
https://www.inforcecomputing.com/products/single-board-computers-sbc/qualcomm-snapdragon-820-inforce-6640-sbc
  SoC: Snapdragon 820

  sysname='Linux',
  nodename='ubuntu',
  release='4.15.0-1069-snapdragon', 
  version='#76-Ubuntu SMP Tue Nov 26 16:10:14 UTC 2019', 
  machine='aarch64'

  The issue is caused by following commit.
  Inforce 6640 doesn't have functional demidecode.
  System will reboot when executing dmidecode.

  commit 3416e2ee7f65defdb15aab861a85767d13e8c34c
  Author: Robert Schweikert <rjsch...@suse.com>
  Date: Sat Oct 29 09:29:53 2016 -0400
      dmidecode: Allow dmidecode to be used on aarch64
      aarch64 systems have functional dmidecode, so allow that to be used.
      - aarch64 has support for dmidecode as well

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