misc: Add release notes for 20.1
Change-Id: I011ff987e222326dd7f0787c41043578b52b236a Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35375 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Matthew Poremba <matthew.poremba@amd.com> Tested-by: kokoro <noreply+kokoro@google.com>
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RELEASE-NOTES.md
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RELEASE-NOTES.md
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# Version 20.1.0.0
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* m5.stats.dump() root argument renamed to roots to reflect the fact that it now takes a list of SimObjects
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Thank you to everyone that made this release possible!
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This has been a very productive release with [150 issues](https://gem5.atlassian.net/), over 650 commits (a 25% increase from the 20.0 release), and 58 unique contributors (a 100% increase!).
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## Process changes
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We are no longer using the "master" branch.
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Instead, we will have two branches:
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* "stable": This will point to the latest stable release (gem5-20.1 as of today)
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* "develop": This is the latest development code that will be merged in to the "stable" branch at each release.
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We suggest all *users* use the stable (default) branch.
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However, to contribute your fixes and new changes to gem5, it should be contributed to the develop branch.
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See CONTRIBUTING.md for more details.
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gem5 has also implemented a project code of conduct.
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See the CODE-OF-CONDUCT.md file for details.
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In the code of conduct "we pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community."
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## New features in 20.1
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### New DRAM interface: Contributed by *Wendy Elsasser*
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You can find details about this on the [gem5 blog](http://www.gem5.org/2020/05/27/memory-controller.html) or Wendy's talks on YouTube: [Talk on new interface and NVM](https://www.youtube.com/watch?v=t2PRoZPwwpk) and the [talk on LPDDR5](https://www.youtube.com/watch?v=ttJ9_I_Avyc)
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* **[PYTHON API CHANGE]**: The DRAM models are now *DRAM interfaces* which is a child of the *memory controller*. Example change shown [in the blog post](http://www.gem5.org/project/2020/07/18/gem5-20-1.html).
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* The DRAM is split into a memory controller and a DRAM interface
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* `SimpleMemory` is no longer a drop-in replacement for a DRAM-based memory controller.
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* LPDDR5 model added
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* NVM model added
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* New memory controller model that can use both NVM and DRAM
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### Improved on-chip interconnect model, HeteroGarnet: Contributed by *Srikant Bharadwaj*
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You can find details about this on the [gem5 blog](http://www.gem5.org/2020/05/27/heterogarnet.html) and [Srikant's talk on YouTube](https://www.youtube.com/watch?v=AH9r44r2lHA).
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* **[USER-FACING CHANGE]**: The network type options are now "simple" and "garnet" instead of "garnet2.0". (If "garnet2.0" is used, you will get a warning until gem5-20.2)
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* Added models for clock domain crossings and serialization/deserialization (SERDES)
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### Transactional memory support: Contributed by *Timothy Hayes*
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You can find details on the [Jira issue](https://gem5.atlassian.net/browse/GEM5-587)
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* gem5 now supports Arm TME (transactional memory extensions)
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* Transactional memory is only implemented in the `MESI_Three_Level_HTM` Ruby protocol, and it is only implemented in Ruby.
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* This implements a checkpointing mechanism for the architectural state and buffering of speculative memory updates.
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* IBM POWER and x86 HTM extensions have *not* been implemented.
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### Other new features
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* External simulator integrations
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* Added support for DRAMSim3
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* Added back support for DRAMSim2
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* Armv8-A Self Hosted Debug extension added
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* KVM support for Armv8-A hosts without GICv2 hardware
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* Implemented Secure EL2 for Armv8-A
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## Removed features
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* Dropped support for mercurial version control
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## New supported platforms
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* GCC up to 10.2 is now supported. Minimum GCC is now 5.0.
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* Clang up to version 9. Minimum Clang is now 3.9.
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## Platforms no longer support
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* **[USER-FACING CHANGE]**: Python 2 is officially deprecated. We will drop support for Python 2 in the next release. In this release you will get a warning if you're using Python 2.
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* **[USER-FACING CHANGE]**: We have dropped support for GCC 4.X
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* **[USER-FACING CHANGE]**: We have dropped support for Scons 2.x (Note: this is the default in Ubuntu 16.04. Use pip to install a newer scons.)
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See <http://www.gem5.org/documentation/general_docs/building> for gem5's current dependencies.
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## Other changes
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### Deprecating "master" and "slave"
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* **[API CHANGE]**: The names "master" and "slave" have been deprecated
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* Special thanks to Lakin Smith, Shivani Parekh, Eden Avivi, and Emily Brickey.
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* Below is a guide to most of the name changes.
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* The goal was to replace problematic language with more descriptive and precise terms.
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* There may be some bugs introduced with this change as there were many places in the Python configurations which relied on "duck typing".
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* This change is mostly backwards compatible and warning will be issued until at least gem5-20.2.
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```
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MasterPort -> RequestorPort
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SlavePort -> ResponsePort
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xbar.slave -> xbar.cpu_side
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xbar.master -> xbar.mem_side
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MasterId -> RequestorId
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```
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### Testing improvements
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* We now have Jenkins server (<http://jenkins.gem5.org/>) running nightly and other large tests. Special thanks to Mike Upton for setting this up!
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* Nightly tests run the "long" regression tests (many tests added).
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* Compiler tests run gem5 build for many targets and all compilers once a week.
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* Updated CI tester (kokoro) to use a more up-to-date environment.
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* Improved the testing infrastructure.
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* Almost all testing resources now available in [gem5-resources repository](https://gem5.googlesource.com/public/gem5-resources/).
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* Generally cleaned up the `tests/` directory in mainline gem5.
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* Many general testlib improvements.
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### More changes
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* **[PYTHON API CHANGE]**: m5.stats.dump() root argument renamed to roots to reflect the fact that it now takes a list of SimObjects
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* **[USER-FACING CHANGE]**: Checkpoint compatibility may be broken by the following changes
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* <https://gem5-review.googlesource.com/c/public/gem5/+/25145>
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* <https://gem5-review.googlesource.com/c/public/gem5/+/31874>
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* **[API CHANGE]** Changed `setCPU` to `setThreadContext` in Interrupts
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* Added a `Compressor` namespace.
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* **[API CHANGE]** The `Callback` class was removed and replaced with C++ lambdas.
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* Many objects' stats have been updated to the "new" stats style.
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* Many more objects have had their APIs formalized. See <http://www.gem5.org/documentation/general_docs/gem5-apis>
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----------------------------------------------------------------------------------------------------
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# Version 20.0.0.3
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