[kernel][x86] Remove printf in early microarch selection code

Early in Fuchsia boot, features.cpp caches and partly decodes CPUID
information; it uses Intel/AMD Family/Model/Stepping to select a
'microarch' config table, with information about C1E promotion,
timer information, and shutdown information.

If an unknown CPU family was found, Fuchsia would attempt to printf;
unfortunately printf() that early in boot, at least on the NUC6, locks
up. The NUC6CAYH has an Intel 'Goldmont' CPU, which is not matched by
the existing Silvermont entry; it is the only system I had access to
that triggered this bug.

Tested:
* Added debug tracing in lk_main(); once this printf() is removed, we
see lk_main() proceed to last init level.

ZX-4201 Fuchsia should run on Intel NUC6CAYH

Change-Id: Ia206a68a044007a645aaf9b29cf39f70706e1d72
1 file changed
tree: 697e55f1240115ef857aa6d791f5bd1f91fefe1f
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. examples/
  7. garnet/
  8. peridot/
  9. products/
  10. scripts/
  11. sdk/
  12. src/
  13. third_party/
  14. tools/
  15. zircon/
  16. .clang-format
  17. .clang-tidy
  18. .dir-locals.el
  19. .gitattributes
  20. .gitignore
  21. .gn
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See the documentation.