[assembly][timekeeper] Firm up use_always_on_counter

We use the always on counter to emulate an RTC chip on platforms that do
not use the classic PC-like RTC circuitry.  But, for this to work we
need two ingredients: the counter itself (a board feature) and a
decision to use it (a platform config option).

This change makes the final selection be a logical AND of the two
settings.  This allows us to introduce the feature tag
`fuchsia::always_on_counter` without changing anything until
the platform bit is turned on.

This is not strictly part of b/388562148, but is part of the changes
needed for some platforms, so I'm attaching it to that bug.

Bug: 388562148
Change-Id: I0af538497af5c82d9ec45acb902cef361a0014e5
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1220268
Fuchsia-Auto-Submit: Filip Filmar <fmil@google.com>
Commit-Queue: Filip Filmar <fmil@google.com>
Reviewed-by: Aidan Wolter <awolter@google.com>
1 file changed
tree: 07cb5d87177220091f38ed5436213fec5b7f2c97
  1. .helix/
  2. boards/
  3. build/
  4. bundles/
  5. docs/
  6. examples/
  7. infra/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .editorconfig
  18. .git-blame-ignore-revs
  19. .gitattributes
  20. .gitignore
  21. .gitmodules
  22. .gn
  23. .ignore
  24. analysis_options.yaml
  25. AUTHORS
  26. BUILD.gn
  27. CODE_OF_CONDUCT.md
  28. CONTRIBUTING.md
  29. fuchsia.code-workspace
  30. LICENSE
  31. OWNERS
  32. PATENTS
  33. pyproject.toml
  34. pyrightconfig.json
  35. README.md
  36. rustfmt.toml
  37. shac.star
  38. shac.textproto
README.md

Fuchsia

What is Fuchsia?

Fuchsia is an open source, general purpose operating system supporting modern 64-bit Intel and ARM processors.

We expect everyone interacting with our project to respect our code of conduct.

Read more about Fuchsia's principles.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.