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opensecura / 3p / lowrisc / opentitan / ca1abd11608eb7d5f6e41e489bc9519f8bdcf4b7
commitca1abd11608eb7d5f6e41e489bc9519f8bdcf4b7[log] [tgz]
authorMichael Munday <mike.munday@lowrisc.org>Thu Jan 20 12:47:33 2022 +0000
committerMichael Munday <mike.munday@lowrisc.org>Fri Jan 21 16:07:46 2022 +0000
tree2efcea629ea980a93d72428762220d8f8d653d0d
parent830b071031de6420a822eb1c823549930aff55cf [diff]
[rom] Setup watchdog timer in assembly before entropy setup

This new code enables the watchdog timer right at the start of mask
ROM execution (before entropy setup and SRAM scrambling). This means
that unless the watchdog timer is 'petted' (i.e. the
aon_timer.WDOG_COUNT register is reset to 0 periodically) the device
will eventually reset itself.

The timeout value is currently the maximum possible (~6 hours assuming
a clock of 200KHz). This value should be reduced to something lower,
issue #10215 tracks this.

This change has been manually tested by setting the timer value to 0
and checking that the device is quickly reset.

Signed-off-by: Michael Munday <mike.munday@lowrisc.org>
3 files changed
tree: 2efcea629ea980a93d72428762220d8f8d653d0d
  1. .github/
  2. ci/
  3. doc/
  4. hw/
  5. rules/
  6. site/
  7. sw/
  8. test/
  9. third_party/
  10. util/
  11. .bazelignore
  12. .bazelrc
  13. .bazelversion
  14. .clang-format
  15. .dockerignore
  16. .flake8
  17. .gitignore
  18. .style.yapf
  19. .svlint.toml
  20. .svls.toml
  21. _index.md
  22. apt-requirements.txt
  23. azure-pipelines.yml
  24. BUILD
  25. check_tool_requirements.core
  26. CLA
  27. COMMITTERS
  28. CONTRIBUTING.md
  29. LICENSE
  30. meson.build
  31. meson_init.sh
  32. meson_options.txt
  33. python-requirements.txt
  34. README.md
  35. tool_requirements.py
  36. toolchain.txt
  37. topgen-reg-only.core
  38. topgen.core
  39. WORKSPACE
  40. yum-requirements.txt
README.md

OpenTitan

OpenTitan logo

About the project

OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.

About this repository

This repository contains hardware, software and utilities written as part of the OpenTitan project. It is structured as monolithic repository, or “monorepo”, where all components live in one repository. It exists to enable collaboration across partners participating in the OpenTitan project.

Documentation

The project contains comprehensive documentation of all IPs and tools. You can access it online at docs.opentitan.org.

How to contribute

Have a look at CONTRIBUTING and our documentation on project organization and processes for guidelines on how to contribute code to this repository.

Licensing

Unless otherwise noted, everything in this repository is covered by the Apache License, Version 2.0 (see LICENSE for full text).