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ibex_configs.yaml
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/
ibex_configs.yaml
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# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0
# Ibex configurations files, holds the parameter sets that are tested under CI.
# Each configuration must specify the same set of parameters
# Two-stage pipeline without additional branch target ALU and 3 cycle multiplier
# (4 cycles for mulh), resulting in 2 stall cycles for mul (3 for mulh)
small:
RV32E : 0
RV32M : "ibex_pkg::RV32MFast"
RV32B : "ibex_pkg::RV32BNone"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 0
WritebackStage : 0
ICache : 0
ICacheECC : 0
BranchPredictor : 0
PMPEnable : 0
PMPGranularity : 0
PMPNumRegions : 4
SecureIbex : 0
ICacheScramble : 0
# Configuration to match that used in the OpenTitan project
opentitan:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BOTEarlGrey"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 1
ICacheECC : 1
BranchPredictor : 0
PMPEnable : 1
PMPGranularity : 0
PMPNumRegions : 16
SecureIbex : 1
ICacheScramble : 0
# ===============================
# * EXPERIMENTAL CONFIGURATIONS *
# ===============================
# Three-stage pipeline with additional branch traget ALU and 1 cycle multiplier
# (2 cycles for mulh) so mul does not stall (mulh stall 1 cycles). This is the
# maximum performance configuration.
experimental-maxperf:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BNone"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 0
ICacheECC : 0
BranchPredictor : 0
PMPEnable : 0
PMPGranularity : 0
PMPNumRegions : 4
SecureIbex : 0
ICacheScramble : 0
# experimental-maxperf config above plus PMP enabled with 16 regions.
experimental-maxperf-pmp:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BNone"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 0
ICacheECC : 0
BranchPredictor : 0
PMPEnable : 1
PMPGranularity : 0
PMPNumRegions : 16
SecureIbex : 0
ICacheScramble : 0
# experimental-maxperf-pmp config above with balanced bitmanip extension
experimental-maxperf-pmp-bmbalanced:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BBalanced"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 0
ICacheECC : 0
BranchPredictor : 0
PMPEnable : 1
PMPGranularity : 0
PMPNumRegions : 16
SecureIbex : 0
ICacheScramble : 0
# experimental-maxperf-pmp config above with full bitmanip extension
experimental-maxperf-pmp-bmfull:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BFull"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 0
ICacheECC : 0
BranchPredictor : 0
PMPEnable : 1
PMPGranularity : 0
PMPNumRegions : 16
SecureIbex : 0
ICacheScramble : 0
# experimental-maxperf-pmp-bmfull config above with icache enabled
experimental-maxperf-pmp-bmfull-icache:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BFull"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 1
ICacheECC : 1
BranchPredictor : 0
PMPEnable : 1
PMPGranularity : 0
PMPNumRegions : 16
SecureIbex : 0
ICacheScramble : 0
# experimental-maxperf with branch predictor switched on. This exists to allow
# easy use of Ibex with the branch predictor in particular for CI runs. The
# branch predictor will be enabled in all the 'maxperf' configs after further
# development.
experimental-branch-predictor:
RV32E : 0
RV32M : "ibex_pkg::RV32MSingleCycle"
RV32B : "ibex_pkg::RV32BNone"
RegFile : "ibex_pkg::RegFileFF"
BranchTargetALU : 1
WritebackStage : 1
ICache : 0
ICacheECC : 0
BranchPredictor : 1
PMPEnable : 0
PMPGranularity : 0
PMPNumRegions : 4
SecureIbex : 0
ICacheScramble : 0