Chisel v6.0.0-M1

Features

• Add ConstType and Const(...) API (by @debs-sifive in #3046)
  Adds Const() API to create ConstTypes, which denotes Data that holds a constant value.
• Implement read-write memory accessors for SyncReadMem (by @jared-barocsi in #3190)
  SyncReadMem.readWrite(address, writeData, enabled, isWrite) explicitly generates a read-write port that supports both read and write access to the memory.
• [Feature] Add Interface, ConformsTo for Separate Compilation (by @seldridge in #3199)
• Handle BoringUtils in Chisel, rather than in FIRRTL compiler (by @azidar in #3187)
  • Added a new BoringUtils.bore that is performed during Chisel elaboration, not via Annotations+CIRCT. Punched ports are accessible to the user via DataMirror. However, using these reflection APIs or calling .toDefinition will fully close a module, to ensure that subsequent boring fails (and thus getting all ports is never stale).
  • Added a skipPrefix to enable ignoring the last prefix value in the prefix name stack.
• API for probing internal signals (by @debs-sifive in #3088)
  Adds an API for probing internal signals.
• Add ClockGate intrinsic (by @fabianschuiki in #3209)
  Add support for the circt.clock_gate intrinsic.
• Added more Connectable customization functions (by @azidar in #3227)
  • Added .unsafe, a useful function on Connectable when users want a connection to "try its best but don't error".
• Added .squeezeAllAs, a useful function on Connectable when users want a connection to always squeeze, as well as upcast if desired.
• Added .as, a useful function on Connectable when users to upcast the Scala type.
• Connectable's now register erroneous connections (e.g. out of scope, unwritable sinks) to throw at end of elaboration
• Allow DataView of Reset <=> [UInt<1>, AsyncReset] (by @seldridge in #3181)
• [feature] Add properties to Interface (by @seldridge in #3238)
• Enable .viewAsSupertype to work on Records (by @mwachs5 in #3267)
  • Allow .viewAsSupertype to work on Records, with additional tests.

• Ensure that errors in DataView show the problematic fields in a deterministic order.

Fixes

• Revert checks for size 0 Vecs in connections (by @jackkoenig in #3215)
• Fix Instantiate for Product parameters (by @jackkoenig in #3210)
  Instantiate previously erased type information for case classes and case objects which could result in incorrect behavior.
• [bugfix] Fix naming module with Unit parameter (by @seldridge in #3263)

Documentation

• [docs] Fix README logo and update versions (by @jackkoenig in #3189)
• [fix] typo fix: chosen port of arbiter is not onehot but UInt (by @SihaoLiu in #3235)
  Just a oneline fix to the comment of Arbiter chosen port

Dependency Updates

• Bump firtool version to 1.40.0 (by @seldridge in #3226)
• Update sbt-ci-release to 1.5.12 (by @scala-steward in #3234)
• Update sbt-mima-plugin to 1.1.2 (by @scala-steward in #3145)
• Update scalacheck-1-14 to 3.2.11.0 (by @scala-steward in #3264)
• Update data-class to 0.2.6 (by @scala-steward in #3049)
• Update sbt-assembly to 2.1.1 (by @scala-steward in #3047)
• Update scopt to 4.1.0 (by @scala-steward in #3048)
• Update upickle to 3.1.0 (by @scala-steward in #3169)

Build and Internal Changes

• Remove PartialConnect (by @seldridge in #3185)
• Update Mergify for backporting to 5.x (by @jackkoenig in #3191)
• Add Chisel Scala CLI template and automation (by @jackkoenig in #3186)
  Add a new Chisel template for using Chisel with Scala CLI, and adds some automation for uploading versions of this template on tagged releases (or workflow dispatch).
• Add Data.findFirstTypeMismatch for better type checking (by @jackkoenig in #3201)
• Read previousVersions for bincompat checking from a file (by @jackkoenig in #3202)
  We can now simply append versions as they are released to project/previous-versions.txt on relevant release branches. build.sbt also now contains instructions are how to waive binary compatibility breakages.
• Enable push CI on all *.x branches (by @jackkoenig in #3222)
• Improve SyncReadMem.read, .readWrite (by @jared-barocsi in #3221)
• Add workflow to automatically update binary compatibility checks (by @jackkoenig in #3242)
• Add new workflow to fixup backports for release notes (by @jackkoenig in #3252)
  Improve backport automation so that release notes generation from backport PRs works properly.
• Update .scala-steward.conf (by @jackkoenig in #3266)
  Make the frequency a legal value (14 days).

Full Changelog: v5.0.0-RC2...v6.0.0-M1