Rocket

• [CSR] add vcsr and move vxrm/vxstat from fcsr to that register set (https://github.com/chipsalliance/rocket-chip/pull/2400, #2422)
• [CSR] disallow writes to MSTATUS.XS (https://github.com/chipsalliance/rocket-chip/pull/2508)
• [CSR] expand TracedInstruction.cause to xLen (https://github.com/chipsalliance/rocket-chip/pull/2548)
• [CSR][mstatus] implement updated MPRV from priv-1.12 (https://github.com/chipsalliance/rocket-chip/pull/2206)
• [CSR] add `mcountinhibit from priv-1.11 (https://github.com/chipsalliance/rocket-chip/pull/2693)
  • ignore PAUSE when mcountinhibit(0) === 1 (#2700)
• [CSR] Comply with priv spec by resetting and initializing mcause to 0 (https://github.com/chipsalliance/rocket-chip/pull/2333)
• [events] add SuperscalarEventSets (https://github.com/chipsalliance/rocket-chip/pull/2337, https://github.com/chipsalliance/rocket-chip/pull/2506)
• [events] make fields public for tapping signals (https://github.com/chipsalliance/rocket-chip/pull/2464, https://github.com/chipsalliance/rocket-chip/pull/2524)
• [i$] fix ccover bug to cover all beats of D channel corruption https://github.com/chipsalliance/rocket-chip/pull/2755
• [d$] updates
  • fix elaboration with < 4 MiB of physical address space (https://github.com/chipsalliance/rocket-chip/pull/2367)
  • guarantee no-alloc accesses are ordered even if aliased (https://github.com/chipsalliance/rocket-chip/pull/2358)
  • [ecc] fixed a rare bug where under the right conditions stores to the same word resulted in one store detecting an error while the other does not (https://github.com/chipsalliance/rocket-chip/pull/2458)
  • [HellaCache] introduce subWordBits param to support subbanking (https://github.com/chipsalliance/rocket-chip/pull/2645)
  • support specifying cache index when aliasing is possible (https://github.com/chipsalliance/rocket-chip/pull/2697, https://github.com/chipsalliance/rocket-chip/pull/2730)
  • reduce latency on inclusion and coherence misses by allowing D$ to voluntarily release (aka "noisy drop") cache lines (https://github.com/chipsalliance/rocket-chip/pull/2696)
    • follow-up to fix deadlock (https://github.com/chipsalliance/rocket-chip/pull/2714)
    • follow-up to fix performance (https://github.com/chipsalliance/rocket-chip/pull/2739)
• distinguish a supervisor mode that does not use MMU/VM (https://github.com/chipsalliance/rocket-chip/pull/2422, #2499)
• [hartid]
  • fixed an issue where the Rocket core's placement would be impacted by non-constant hartid (https://github.com/chipsalliance/rocket-chip/pull/2432)
  • add a diplomatic node for assigning hartid (https://github.com/chipsalliance/rocket-chip/pull/2447)
• [Replacement][PseudoLRU] fix performance issue with PseudoLRU for replacements when number of ways is not a power of 2 (https://github.com/chipsalliance/rocket-chip/pull/2493, #2498)
• [Replacement][d$] configure replacement policy with parameter to indicate wheteher policy is used on a per-set basis or a global basis (https://github.com/chipsalliance/rocket-chip/pull/2656)
• [PTW]
  • replace round robin arbitration with static arbitration (https://github.com/chipsalliance/rocket-chip/pull/2433)
  • fixed a bug where an L2TLB write would almost always block the next L2TLB search when MMU and clock gating were enabled (https://github.com/chipsalliance/rocket-chip/pull/2601)
  • wait for L2TLB to refill before searching (https://github.com/chipsalliance/rocket-chip/pull/2619)
  • [PTWPerfEvents] add (unused) Performance Monitor Events for L2TLB hit and PTE Cache Miss/Hit (https://github.com/chipsalliance/rocket-chip/pull/2668, https://github.com/chipsalliance/rocket-chip/pull/2688, https://github.com/chipsalliance/rocket-chip/pull/2692)
  • enable configurable set-associtive L2 TLB (https://github.com/chipsalliance/rocket-chip/pull/2748, https://github.com/chipsalliance/rocket-chip/pull/2753)
    • default configuration is direct-mapped
• enable Sv48 setting page levels equal to 4 (https://github.com/chipsalliance/rocket-chip/pull/2434)
• [PMP] remove NA4 coverpoint for pmp granularity > 4 (https://github.com/chipsalliance/rocket-chip/pull/2625)
• [TLB]
  • check PutPartial support separately from PutFull (https://github.com/chipsalliance/rocket-chip/pull/2503)
  • fix a rare refill/invalidate race condition (https://github.com/chipsalliance/rocket-chip/pull/2534)
  • configure L1 D/I TLBs by set, entry, and replacement policy (https://github.com/chipsalliance/rocket-chip/pull/2574, https://github.com/chipsalliance/rocket-chip/pull/2621)
  • add params nTLBBasePageSectors and nTLBSuperpages for both I and D TLBs https://github.com/chipsalliance/rocket-chip/pull/2595
• [CoreMonitor]
  • add privilege mode and exception signals (https://github.com/chipsalliance/rocket-chip/pull/2387)
  • now prints only retired instructions (https://github.com/chipsalliance/rocket-chip/pull/2372)
  • separate wren into wrenx/wrenf for integer/float (https://github.com/chipsalliance/rocket-chip/pull/2423/)
  • Add [CoreMonitorBundle] for [FPU] floating point registers (https://github.com/chipsalliance/rocket-chip/pull/2538, https://github.com/chipsalliance/rocket-chip/pull/2541, https://github.com/chipsalliance/rocket-chip/pull/2546, https://github.com/chipsalliance/rocket-chip/pull/2589)
• [FPU] Zfh extension, option for Half-Precision unit (https://github.com/chipsalliance/rocket-chip/pull/2723)
  • replaces singleIn and singleOut with typeTagIn and typeTagOut
• preliminary RV32Zfh extension support (https://github.com/chipsalliance/rocket-chip/pull/2359)
• [RVV] -> 0.9 -> 1.0 (#2477, #2484, #2396, #2552, #2576)
  • Fractional LMUL
  • Tail-agnostic/mask-agnostic bits
  • EEW loads/stores
  • Some encoding changes
  • tighten fractional LMUL-SEW constraint
  • Instructions: add new and update RISC-V vector extension opcodes
  • reorder fields in vtype
• add B extension opcodes and object model description (https://github.com/chipsalliance/rocket-chip/pull/2678)
• fixed an issue where multiplierIO was unclonable (https://github.com/chipsalliance/rocket-chip/pull/2331)

Devices

• [PLIC] add support for PLIC elaboration even when nDevices == 0 (https://github.com/chipsalliance/rocket-chip/pull/2351)
• [PLIC] fix off-by-one for priority register description (https://github.com/chipsalliance/rocket-chip/pull/2718)
• [BuildInDevices] introduce case class parameters to Zero and Error device https://github.com/chipsalliance/rocket-chip/pull/2684
  • make instantiation of buffers optional
  • allow for optional instantiation of CacheCork
• [BasicBusBlocker] convert to chisel3, add scala-doc, add factory companion object (https://github.com/chipsalliance/rocket-chip/pull/2630)
• [PhysicalFilter] added scaladoc and RegFieldDesc (#2685)
• [BEU]
  • added a Device Tree description for the bus error unit (https://github.com/chipsalliance/rocket-chip/pull/2373)
  • report Corrupt+Denied on I-Fetch (https://github.com/chipsalliance/rocket-chip/pull/2482)

PRCI

• [ResetSynchronizer][ClockGroupResetSynchronizer] add a pair of diplomatic reset synchronizers (https://github.com/chipsalliance/rocket-chip/pull/2666)
  • replaced IdentityNodes with AdapterNodes (https://github.com/chipsalliance/rocket-chip/pull/2689)
• wrap Tiles in PRCI Domains (https://github.com/chipsalliance/rocket-chip/pull/2550)
  • contains logic related to power, reset, clock, and interrupt
• define ResetCrossingType and use with BlockDuringReset in TilePRCIDomain (https://github.com/chipsalliance/rocket-chip/pull/2641/)
  • analogous to ClockCrossingType. Currently, there are two crossing types: NoResetCrossing and StretchedResetCrossing(cycles: Int)
  • introduces Blockable util
• Synchronizer primitive changes (https://github.com/chipsalliance/rocket-chip/pull/2212)
  • introduction of ClockCrossingReg
  • _SynchronizerShiftReg requires synchronizer depth > 1
  • deprecate IntXing and IntSyncCrossingSink
  • deprecate SyncResetSynchronizerShiftReg
• [SynchronizerPrimitiveShiftReg] correct the dedup behavior for the *ResetSynchronizerPrimitiveShiftReg so you only end up with one copy (https://github.com/chipsalliance/rocket-chip/pull/2547)
• add partial multiple reset scheme support (https://github.com/chipsalliance/rocket-chip/pull/2375)
• AsyncResetReg: use chisel3 async resets (#2397)
• Async Reset support for Atomics, FPU, and TLBroadcast (https://github.com/chipsalliance/rocket-chip/pull/2362)
• [ResetStretcher][PRCI] add reset stretcher for Async Reset systems (https://github.com/chipsalliance/rocket-chip/pull/2566)
• ClockGroupDriverParameters: allow for a configurable drive function for driving asynchronous clock groups with IO other than the implicit clock (https://github.com/chipsalliance/rocket-chip/pull/2319)
• [ClockDivider] fixed bug where clock divider's source and sink functions always divided by two (https://github.com/chipsalliance/rocket-chip/pull/2610)
• [InterruptBusWrapper] update synchronizer API https://github.com/chipsalliance/rocket-chip/pull/2640
  • replaces using IntXing in a synchronize method with to and from methods
  • this is to ensure synchronized registers are always put in the destination clock domain

Tile

• [notification] provide reset values for cease and wfi (https://github.com/chipsalliance/rocket-chip/pull/2449)
• [notification][CSR] Block wfi, halt, cease, and other valid signals during asynchronous reset (https://github.com/chipsalliance/rocket-chip/pull/2611)
  • trace.valid of CSR changed to async-reset delay (https://github.com/chipsalliance/rocket-chip/pull/2613)
• [notification][WFI] expose WFI from core (https://github.com/chipsalliance/rocket-chip/pull/2315)
• [i$] fixed bug where cease signal was asserted before potential glitching in I$ clock finished. Add an assertion to cease signal. (https://github.com/chipsalliance/rocket-chip/pull/2419/, https://github.com/chipsalliance/rocket-chip/pull/2420/, https://github.com/chipsalliance/rocket-chip/pull/2456/)
• [PMP][DTS] add pmp granularity to DTS (https://github.com/chipsalliance/rocket-chip/pull/2661)
• [NMI] introduce non-maskable interrupt implementation (https://github.com/chipsalliance/rocket-chip/pull/2711)
• val tiles in trait HasTiles is now populated eagerly via the TilesLocated Field. (https://github.com/chipsalliance/rocket-chip/pull/2504)

Subsystem

• [HasTiles] add seipNode (https://github.com/chipsalliance/rocket-chip/pull/2665)
• Topology changed from static traits to CDE-based configurable runtime (https://github.com/chipsalliance/rocket-chip/pull/2327)
  • HasHierachicalBusTopology trait replaced with two config options:
    • WithCoherentBusTopology
    • WithIncoherentBusTopology
• renamed attachment API to location API (https://github.com/chipsalliance/rocket-chip/pull/2330)
• [BundleBridge] to propagate [TileInputConstants]. ROM attachment changes (https://github.com/chipsalliance/rocket-chip/pull/2521 merged as https://github.com/chipsalliance/rocket-chip/pull/2531)
  • HasPeripheryBootROM and HasPeripheryBootROMModuleImp are removed and replaced by a call to BootROM.attach
  • BootROMParams Field is removed and replaced with BootROMLocated Field
  • MaskROMLocated Field is added
  • SubsystemExternalResetVectorKey, SubsystemExternalHartIdWidthKey and InsertTimingClosureRegistersOnHartIds Fields are added
  • Unused ResetVectorBits Field is removed
  • HasExternallyDrivenTileConstants bundle mixin is removed
  • HasResetVectorWire subsystem trait is removed
  • HasTileInputConstants and InstantiatesTiles subsystem traits are added
  • BaseTile exposes val hartIdNode: BundleBridgeNode[UInt] and resetVectorNode: BundleBridgeNode[UInt] and these are automatically connected to in HasTiles.
  • rocket.Frontend, rocket.ICache, rocket.DCache, rocket.NDCache now have BundleBridgeSink[UInt] for their reset vector or hartid wire inputs.
    • If you instantiate them manually, i.e. not using the traits e.g. rocket.HasHellaCache, you will have to manually connect up those nodes to the aforementioned BaseTile nodes.
  • follow up PR - bug fix for HartID and ResetVector width calcluation (https://github.com/chipsalliance/rocket-chip/pull/2543/)
• add HierarchicalLocation to LocationAPI (https://github.com/chipsalliance/rocket-chip/pull/2346/)
• [RocketCrossingParams] relax type of master param to TilePortParamsLike (https://github.com/chipsalliance/rocket-chip/pull/2634/)
• [Subsystem] Miscellaenous subsystem bus crossing changes (https://github.com/chipsalliance/rocket-chip/pull/2724)
  • introduce keys for bus crossings
  • allow for disabling of DriveClockFromMaster behavior
  • introduce MBus crossing to CoherentBusTopology
• [Subsystem][PLIC] avoid using implicit clock (https://github.com/chipsalliance/rocket-chip/pull/2719)
• Add an optional TileInputConstant as an MMIO Address Prefix used in ITIM and DTIM hit calculations (https://github.com/chipsalliance/rocket-chip/pull/2533)
  • follow-up: fix traceCoreNode duplication issue (https://github.com/chipsalliance/rocket-chip/pull/2561)

stage, linting, transforms

• [stage] Fix a bug where unserializable RocketTestSuiteAnnotations were being serialized (https://github.com/chipsalliance/rocket-chip/pull/2424)
• [stage] Fix a bug where the desired output file name was being superseded by another phase (https://github.com/chipsalliance/rocket-chip/pull/2424)
• [RocketChipStage] Remove emitVerilog, emitFirrtl, and emitChirrtl methods from RocketChipStage (https://github.com/chipsalliance/rocket-chip/pull/2481)
• [stage] expose Stage's --target-dir to Config (https://github.com/chipsalliance/rocket-chip/pull/2725)
• [Transforms][Lint] add RenameDesiredNames transform and LintConflictingModuleNames Lint rule (https://github.com/chipsalliance/rocket-chip/pull/2452)
  • also adds RenameModulesAspect that can be used to emit name overrides and a LintConflictingModuleNamesAspect to collect DesiredNameAnnotations to be checked by the lint pass.
• [ElaborationArtefactAnnotation] add ElaborationArtefactAnnotation - an API similar to ElaborationArtefacts (#2727)
  • this API is for assuring metadata has correct instance paths and signal names
  • allow renames to multiple targets for MemoryPathToken (https://github.com/chipsalliance/rocket-chip/pull/2729)

Debug

• mcontext and scontext CSRs for breakpoint qualification (https://github.com/chipsalliance/rocket-chip/pull/2588/)
• allow a fast debugger reading dmstatus in a single dminner clock cycle to read the proper value (https://github.com/chipsalliance/rocket-chip/pull/2412)
• fix address sent from DM to SB2TL (https://github.com/chipsalliance/rocket-chip/pull/2559)
• add bus blocker to deny requests to dmInner when dmactive = 0 (https://github.com/chipsalliance/rocket-chip/pull/2205)
• DMIToTL: remove PutPartial (https://github.com/chipsalliance/rocket-chip/pull/2598)
• convert registers and wires from a Regs of Vector to Regs of UInt (https://github.com/chipsalliance/rocket-chip/pull/2597)
• make instantiation of reset synchronizers optional (https://github.com/chipsalliance/rocket-chip/pull/2626)
• allow DM at base address other than 0 (https://github.com/chipsalliance/rocket-chip/pull/2649)
• [Periphery] workaround an autonaming bug with debug (https://github.com/chipsalliance/rocket-chip/pull/2657)
• make nExtTriggers a val for compatibility with cloneType (https://github.com/chipsalliance/rocket-chip/pull/2667/)
• [BPWatch] have the watchpoint compare to store or load instruction type for matching (https://github.com/chipsalliance/rocket-chip/pull/2317)

AMBA, Tilelink

• combine modifiable and cacheable, add read and write alloc fields (https://github.com/chipsalliance/rocket-chip/pull/2386)
• [AXI4Deinterleaver][AXI4IdIndexer][AXI4UserYanker][TLToAXI4][Anotations] (https://github.com/chipsalliance/rocket-chip/pull/2676)
  • Scala doc
  • Clarifying comments
  • Unify TLToAXI4 metadata code paths into a single path through TLtoAXI4IdMap
  • Make any value of TLToAXI4.stripBits other than 0 illegal and stop using it internally.
  • Remove usage of un-consumed Annotated.idMapping and delete associated application and annotation class.
• [AXI4Deinterleaver] support asynchronous reset (https://github.com/chipsalliance/rocket-chip/pull/2479/)
• [AXI4Deinterleaver] add buffer when optimized away (https://github.com/chipsalliance/rocket-chip/pull/2642, https://github.com/chipsalliance/rocket-chip/pull/2652)
• [AXIS] allow masters to carry resources (#2443)
• [SRAM] accomodate address ranges that require more than 32 bits https://github.com/chipsalliance/rocket-chip/pull/2491
• [SRAM] Add public accessors for SRAM modules https://github.com/chipsalliance/rocket-chip/pull/2646
• [SimAXIMem] introduce base address argument to constructor https://github.com/chipsalliance/rocket-chip/pull/2628
• [TLRAM] improved cycle time for designs involving TLRAM https://github.com/chipsalliance/rocket-chip/pull/2582
• TLMonitors: formal verification support and additional constraints
  • TLVIP2 (https://github.com/chipsalliance/rocket-chip/pull/2271, #2505, #2754, #2537, #2573)
  • change isShrink TLPermissions assertion on C channel to isReport (https://github.com/chipsalliance/rocket-chip/pull/2675)
• TLEdge: add require failure messages for TL edges (https://github.com/chipsalliance/rocket-chip/pull/2313/)
• minor tilelink v1 parameter fixes for setName and probe rendering (https://github.com/chipsalliance/rocket-chip/pull/2428)
• [TLParameters] add v2 constructors (https://github.com/chipsalliance/rocket-chip/pull/2532)
• [TLParameters] functions to look at emits parameters (https://github.com/chipsalliance/rocket-chip/pull/2572)
• [Parameters] replace cover function with mincover (https://github.com/chipsalliance/rocket-chip/pull/2571)
• [APBToTL] only assert address alignment when data is ready and valid on a-channel (https://github.com/chipsalliance/rocket-chip/pull/2314)
• [TLBroadcast][TLSourceShrinker][TLCacheCork][SBA][$] Drive or pass through TL user bits (#2457, #2448, #2383, #2446)
• [TLBroadcast] add API to create Probe filters for Broadcast coherence manager (https://github.com/chipsalliance/rocket-chip/pull/2509)
• [TLBroadcast] fixed a Generator bug when instantiated with no inner cache (https://github.com/chipsalliance/rocket-chip/pull/2516)
• [TLBroadcast] Add control parameters for control interface (https://github.com/chipsalliance/rocket-chip/pull/2519)
• make it possible to filter with Banked Broadcast Hub (https://github.com/chipsalliance/rocket-chip/pull/2545)
• [TLSourceShrinker] preserve meta data when no shrinkage is required (#2466)
• [TLFragmenter] ensure Fragmenter raises corrupt signal when raising denied (#2468)
• [Tilelink][Arbiter][Xbar][ReadyValidCancel] Add new API that replaces valid with earlyValid and lateCancel to fix a timing path for A-channel requests (https://github.com/chipsalliance/rocket-chip/pull/2480, https://github.com/chipsalliance/rocket-chip/pull/2488)
• [TLCacheCork] prevent cache block write size from exceeding read size (https://github.com/chipsalliance/rocket-chip/pull/2527)
• [TLCacheCork] switch CacheCork class to take a case class parameter (https://github.com/chipsalliance/rocket-chip/pull/2684)
  • with backwards compatible constructor in helper object
• [TLBundle] C channel now has same user bits as A channel (https://github.com/chipsalliance/rocket-chip/pull/2632)
  • caches now responsible for driving AMBAProt on C-channel.
• [TLArbiter] add highestIndexFirst arbitration policy (https://github.com/chipsalliance/rocket-chip/pull/2587)
• [AHBToTL] retain AHB hrdata even during error response (https://github.com/chipsalliance/rocket-chip/pull/2512)
• [AHBToTL] fix spurious fire of assertion on first cycle (https://github.com/chipsalliance/rocket-chip/pull/2523)
• [CreditedIO] introduce new DecoupledIO interface for credit debit buffers (https://github.com/chipsalliance/rocket-chip/pull/2555)
• [IdMap][IdMapEntry] standardize IdMap and IdMapEntry (https://github.com/chipsalliance/rocket-chip/pull/2483)
  • [AXI4IdIndexer] later fixed a bug with graphml parsing metadata bracketed in "< >" (https://github.com/chipsalliance/rocket-chip/pull/2638)
• [IdMapEntry][OMIdMapEntry] add maxTransactionsInFlight field https://github.com/chipsalliance/rocket-chip/pull/2627

Diplomacy

• versioning support for tilelink parameters (https://github.com/chipsalliance/rocket-chip/pull/2320)
• allow users to access Lazy Module nodes (https://github.com/chipsalliance/rocket-chip/pull/2301)
• JunctionNodes now support configurable up/down ratio (https://github.com/chipsalliance/rocket-chip/pull/2430)
• dynamic and remote order: fix QoR in designs with large physical address maps (https://github.com/chipsalliance/rocket-chip/pull/2461)
• [AddressSet] fix a bug where duplicated AddressSets would cause incorrect widening when unify is called. (#2502)
• [LazyModule]
  • mark LazyModules for inlining such as nodes with circuit identity (inputs are outputted unchanged) (https://github.com/chipsalliance/rocket-chip/pull/2579)
    • inline xbar patch: (https://github.com/chipsalliance/rocket-chip/pull/2639)
  • add scaladoc (https://github.com/chipsalliance/rocket-chip/pull/2311)
• Added more debug info to node requires (https://github.com/chipsalliance/rocket-chip/pull/2577)
• [Nodes] documentation for Nodes (https://github.com/chipsalliance/rocket-chip/pull/2604)
• [Nodes] replace bundleSafeNow guard with instantiated guard (https://github.com/chipsalliance/rocket-chip/pull/2680)
• tutorial for adder (https://github.com/chipsalliance/rocket-chip/pull/2615)
• [aop][Select] add Select Library API (#2674)
• [DTS] allow node names up to 48 bytes (https://github.com/chipsalliance/rocket-chip/pull/2570)
• [AddressAdjuster] and RegionReplicator now work on prefixes (not chip id) (https://github.com/chipsalliance/rocket-chip/pull/2430)
  • removes MultiChipMaskKey
• [AddressAdjuster] patches (#2470)
  • user can now supply a default local base address for reporting manager address metadata other than the 0th region
  • let local and remote legs have different user bits using <:= operator
  • allow for no fifo ordering on the replicated region
  • more verbose requires
• [BundleBridge] generalize BundleBroadcast into BundleBridgeNexus (https://github.com/chipsalliance/rocket-chip/pull/2497)
  • user can now supply input and output functions
• [BundleBridge] add SafeRegNext to BundleBridgeNexus to preserve width (https://github.com/chipsalliance/rocket-chip/pull/2520)
• [BundleBroadcast] add register pipelining argument (https://github.com/chipsalliance/rocket-chip/pull/2431)

Object Model

• [OMMemoryMap] require register map to only go to one memory region (https://github.com/chipsalliance/rocket-chip/pull/2496)
• [OMErrorDevice] added to Object Model (https://github.com/chipsalliance/rocket-chip/pull/2410, https://github.com/chipsalliance/rocket-chip/pull/2411)
• added IdRange, IDMap to include source ids in object model (#2495)
• added L2UTLB entries and memory (https://github.com/chipsalliance/rocket-chip/pull/2606)
• [OMISA] Add OMVectorExtension.vstartALU field (https://github.com/chipsalliance/rocket-chip/pull/2578)
• [RegFieldDesc]
  • add AddressBlocks for RegFieldDesc (https://github.com/chipsalliance/rocket-chip/pull/2437)
  • require RegFieldDesc to match RegEx to limit to a subspect of IP-XACT standard (https://github.com/chipsalliance/rocket-chip/pull/2525)
• updates for AHB and AXI (https://github.com/chipsalliance/rocket-chip/pull/2427)
• add Zfh extension (https://github.com/chipsalliance/rocket-chip/pull/2581)

Utilities, QoL, Other

• make RC more tolerant to x-prop (https://github.com/chipsalliance/rocket-chip/pull/2659)
• [util][rotate] fix rotate for zero-width wires (https://github.com/chipsalliance/rocket-chip/pull/2663)
• [SimJTAG][SimDTM] fix a verilator bug due to delay statements (https://github.com/chipsalliance/rocket-chip/pull/2635)
• register coverage now generated based on access type (https://github.com/chipsalliance/rocket-chip/pull/2384)
• [BundleMap] improved API for user bits
  • Customizable field unification, Default for bulk assignments, Field and Key class required (https://github.com/chipsalliance/rocket-chip/pull/2318)
  • Use BundleMap for AMBA protocols (https://github.com/chipsalliance/rocket-chip/pull/2326)
  • various bug fixes to TL user fields (https://github.com/chipsalliance/rocket-chip/pull/2335)
• [FixChisel3] Added some scaladoc commentary to the operators :<>, :<=, :=> to explain what they do and the rationale for their creation. (#2339)
• [util] Add utilities for bitwise shifts by signed shift amounts (#2477)
• [TLBusWrapper] more stability to internal wire names (https://github.com/chipsalliance/rocket-chip/pull/2515)
• [LazyRoCC] convert LazyRoCC to chisel3 (https://github.com/chipsalliance/rocket-chip/pull/2553)
• [OptimizationBarrier] give the module a name in generated verilog (#2507)
• add test enable pin to Clock Gate (https://github.com/chipsalliance/rocket-chip/pull/2087)
• [RecordMap] addd as an API for better diplomatic IO naming https://github.com/chipsalliance/rocket-chip/pull/2486
  • used to get easier to follow Clock Group signal names https://github.com/chipsalliance/rocket-chip/pull/2528
• [IDPool] enable ResetAsynchronous Full (https://github.com/chipsalliance/rocket-chip/pull/2568)
• [IDPool] add lateValid and revocableSelect to shift the deep logic cones from before the valid/selec registers to after the bitmap register (https://github.com/chipsalliance/rocket-chip/pull/2673, https://github.com/chipsalliance/rocket-chip/pull/2677)
• [IDPool] infer widths (https://github.com/chipsalliance/rocket-chip/pull/2679)
• Make AsyncValidSync a RawModule (https://github.com/chipsalliance/rocket-chip/pull/2352)
• compiler warning fixes (#2357, #2356, #2355, #2354, #2353, #2378, #2379, #2380, #2442, #2567, #2757, #2758)
• [SCIE] fix width mismatch assignment lint warning from VCS (https://github.com/chipsalliance/rocket-chip/pull/2563)
• Initial scalatest flow support and aspect generation (https://github.com/chipsalliance/rocket-chip/pull/2309/, https://github.com/chipsalliance/rocket-chip/pull/2517)
• [linting] add Chisel Linting Framework (https://github.com/chipsalliance/rocket-chip/pull/2435)
• [scalafix] enable scalafix and remove unused imports (https://github.com/chipsalliance/rocket-chip/pull/2648)
  • This requires downstream projects using rocket-chip's build.sbt to enable scalafix.
  • enable LeakingImplicitClassVal (https://github.com/chipsalliance/rocket-chip/pull/2650)
  • enable ProcedureSyntax (https://github.com/chipsalliance/rocket-chip/pull/2651)
• mdoc infrastructure (https://github.com/chipsalliance/rocket-chip/pull/2615)
• [PlusArg]
  • support for no-default PlusArgs and string-valued PlusArgs (#2453)
  • fix VCS lint warning for plusarg default bit width (#2558, #2562)
• decode: improve runtime (https://github.com/chipsalliance/rocket-chip/pull/2462)
• Switch to using Github Actions (https://github.com/chipsalliance/rocket-chip/pull/2465, #2472, #2530, #2536)
• Some Travis changes were made, but travis is dropped in later releases (#2451, #2454, #2455, #2490)
• Add scalatest to a bucket for regression testing (https://github.com/chipsalliance/rocket-chip/pull/2511)
• RTLSim trace log:
  • fixed an issue where the wrong destination register being dumped in the RTLSim trace log (https://github.com/chipsalliance/rocket-chip/pull/2409/)
  • enhanced log so only registers read or written are printed (https://github.com/chipsalliance/rocket-chip/pull/2414)
• add CONTRIBUTING.md (https://github.com/chipsalliance/rocket-chip/pull/2342, https://github.com/chipsalliance/rocket-chip/pull/2473)
• [wake]
  • add self-location rules (https://github.com/chipsalliance/rocket-chip/pull/2526)
  • fix string interpolation of bootrom path (https://github.com/chipsalliance/rocket-chip/pull/2535)
  • publish location of ivydependencies.json (https://github.com/chipsalliance/rocket-chip/pull/2540)
  • update CI to 0.19.0 (https://github.com/chipsalliance/rocket-chip/pull/2594 superseding https://github.com/chipsalliance/rocket-chip/pull/2584)
  • avoid hardcoded directory path for hardfloat repo https://github.com/chipsalliance/rocket-chip/pull/2633
• [mill] add mill build system (https://github.com/chipsalliance/rocket-chip/pull/2654)
• [sbt] remove jgit-repo resolver (https://github.com/chipsalliance/rocket-chip/pull/2364)