Document your own firmware settings before you ever need them

short · 40 min · Objective 3.4

Task

Record the firmware configuration of a machine you own, identify the settings that matter, and establish what a dead coin cell would change -- so that the symptoms are recognisable rather than mysterious.

Steps

  1. Enter the firmware settings and record the version, date and the board or system model in lab/fw/version.csv with header field,value.
  2. Record the settings that matter in lab/fw/settings.csv with header setting,current_value,what_it_affects covering at least boot order, virtualisation support, secure boot, boot mode and storage mode.
  3. Record whether virtualisation support is enabled. If it is disabled and you intend to run the domain 4 labs, enable it and record the change in lab/fw/changed.md with what it was before.
  4. Write lab/fw/clock.md recording the system date and time as the firmware reports it, and listing three symptoms a wrong clock would produce at the operating system level.
  5. Write lab/fw/coincell.md listing what the coin cell holds, what it does not, and the four symptoms of its failure in the order a user would notice them.

Verify

awk -F, 'NR>1 && NF>=2 {n++} END {print n" version field(s)"}' lab/fw/version.csv
awk -F, 'NR>1 && NF>=3 {n++} END {print n" setting(s) recorded"}' lab/fw/settings.csv
grep -Eic 'virtuali' lab/fw/settings.csv
grep -Eic 'certificate|time|clock|logon|domain' lab/fw/clock.md
grep -Eic 'clock|setting|checksum|certificate' lab/fw/coincell.md

Two or more version fields, five or more settings with their effects, a virtualisation row present, and both notes covering the downstream symptoms. The certificate-error symptom is the one that matters: a user reporting that no secure site works has a clock problem, not a network problem.

Notes

Record this before you need it. A machine whose firmware settings are documented can be restored after a coin cell failure in two minutes; one whose settings nobody wrote down is a guessing exercise with a storage mode that has to be right.

This is an independent study companion for CompTIA A+ Core 1 220-1201 and is not produced by or endorsed by CompTIA.