lowRISC/ibex

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Ibex is a small 32-bit RISC-V CPU core with high-level of verification (previously known as zero-riscy)

Stars: 2.1k
Forks: 810
Open beginner issues: 0
Indexed issues: 205
Avg merge: 5d 23h
Merged PRs (30d): 9

Dominant language: SystemVerilog
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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205 open issues indexed

[rtl] Refactor register files to bring common logic together Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2217 · Opened Sep 17, 2024
Missing `ifdef guard from assertion in ibex_core.sv Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2213 · 6 comments · Opened Sep 5, 2024
error gen wrong path and failed to create spike-cosim_trace_core.log file by xrun Open

Type:Bug

Difficulty 3/5 1-2 days Newbie friendliness 20/100

lowRISC/ibex#2210 · 1 comment · Opened Aug 27, 2024
[rtl] Declare Zkt - Scalar crypto data independent execution latency compliance Open

Component:RTL Type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2202 · 5 comments · Opened Aug 9, 2024
[rtl] Implement Zbkb - scalar crypto bitmanip Open

Component:RTL Type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2201 · Opened Aug 9, 2024
[doc] Disambiguate doc around ECC detection on the data interface Open

Component:Doc

lowRISC/ibex#2200 · 2 comments · 2 reactions · 1 assignee · Opened Aug 8, 2024
Ibex simple system cannot simulate with timing flag in Verilator Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2199 · 2 comments · Opened Aug 6, 2024
Tests failing when running regression using Questa Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2198 · Opened Jul 29, 2024
How to connect the SRAM generated by the memory compiler to the Ibex core and verify its functionality? Open

Type:Question

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2197 · 5 comments · Opened Jul 26, 2024
Integration of 6T SRAM with the Ibex core Open

Type:Question

Difficulty 5/5 Over a week Newbie friendliness 20/100

lowRISC/ibex#2194 · 5 comments · Opened Jul 19, 2024
Illegal_reg_rv32e not updated on two consecutive multicycle invalid instructions Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2192 · 1 comment · Opened Jul 18, 2024
[dv] Deep dive regression triage Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lowRISC/ibex#2187 · 4 comments · Opened Jul 4, 2024
[rtl] Behaviour of debug single stepping with dummy instruction insertion may be surprising Open

Component:RTL Type:Bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2186 · 3 comments · Opened Jul 4, 2024
Objcopy as replacement to srec_cat command Open

Type:Question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

lowRISC/ibex#2179 · Opened Jun 27, 2024
Store instructions do not always raise RV32E exceptions Open

Type:Bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

lowRISC/ibex#2178 · 3 comments · Opened Jun 26, 2024
Ask a question related to Ibex Open

Type:Question

Difficulty 3/5 1-2 days Newbie friendliness 25/100

lowRISC/ibex#2172 · Opened Jun 6, 2024
Incorrect stalling behaviour for configurations with writeback stage but without branch target ALU results in an incorrect branch target Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2169 · 1 comment · Opened May 28, 2024
Spike not generating csrrw and compressed instructions Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2168 · Opened May 28, 2024
Report a bug in Ibex Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2167 · Opened May 27, 2024
Trap Return with activated Branch Prediction results in an unintended instruction retire Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lowRISC/ibex#2165 · Opened May 7, 2024
Compilation issue in ibex bring-up Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

lowRISC/ibex#2161 · Opened Apr 18, 2024
Exception occuring when calling cryptographic function Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2159 · Opened Apr 5, 2024
Error in Simple system VCS+Verdi simulation, Failed to find the Verdi database Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2143 · 3 comments · Opened Feb 19, 2024
Upgrade verilator Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

lowRISC/ibex#2134 · 2 comments · Opened Jan 19, 2024
Cosim mismatch in some tests with PMP enabled using QuestaSim Open

Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2124 · 5 comments · Opened Jan 10, 2024
How to run the regression test suite for Ibex design verification? Open

Type:Question

Difficulty 3/5 1-2 days Newbie friendliness 25/100

lowRISC/ibex#2122 · Opened Jan 3, 2024
Issue with Questa Open

Type:Question

Difficulty 5/5 Over a week Newbie friendliness 20/100

lowRISC/ibex#2110 · Opened Dec 9, 2023
Running ibex-core dv env in questa Open

Type:Question

lowRISC/ibex#2108 · 16 comments · 1 assignee · Opened Nov 29, 2023
How can I run ibex RTL simulation with VCS on Ubuntu Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2106 · Opened Nov 22, 2023
Ask a question related to Ibex Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2100 · 3 comments · Opened Nov 15, 2023
[dv] Improve instruction trace around faulting instructions Open

Component:DV Type:Enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

lowRISC/ibex#2099 · Opened Nov 8, 2023
Ask a question related to Ibex Open

Type:Question

Difficulty 5/5 Over a week Newbie friendliness 15/100

lowRISC/ibex#2098 · Opened Oct 25, 2023
python flow error: dv/uvm/core_ibex/scripts/riscvdv_interface.py", line 165, in get_tool_cmds raise RuntimeError Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2095 · 11 comments · Opened Oct 18, 2023
Three questions about ibex Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2070 · Opened Aug 11, 2023
Ask a question related to Ibex, behavior simulation error in Vivado Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2065 · 1 comment · Opened Jul 31, 2023
[dv] Directed test to check PoR values of CSRs Open

Component:DV Type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2057 · 1 comment · Opened Jul 3, 2023
[dv, fcov] Look at use of U mode in riscv_mem_intg_error_test Open

Component:DV Type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2053 · Opened Jun 22, 2023
[dv] Add testing and coverage for direct mode mtvec from #2044 Open

Component:DV Type:Task

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#2047 · 3 comments · Opened Jun 12, 2023
Change Ibex Reset vector address Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2041 · 1 comment · Opened May 26, 2023
Hamming distance between (critical) instructions Open

Component:RTL Type:Enhancement Type:Question

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2036 · 1 comment · 1 reaction · Opened May 17, 2023
fence instruction throwing unexpected illegal in RV32E congfiguration Open

Component:RTL Priority:P3 Type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lowRISC/ibex#2022 · 2 comments · Opened Apr 21, 2023
[dv] Verify data_rvalid_i hardening Open

Component:DV Priority:P3 Type:Task

Difficulty 3/5 1-2 days Newbie friendliness 35/100

lowRISC/ibex#2021 · 1 comment · Opened Apr 21, 2023
[dv] Add coverpoint for writing reserved bits of pmpcfg and hit it Open

Component:DV Priority:P3 Type:Task

Difficulty 3/5 1-2 days Newbie friendliness 25/100

lowRISC/ibex#2019 · Opened Apr 21, 2023
[cosim] Consider different interrupt/debug request notification mechanism Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2015 · Opened Apr 14, 2023
Transition documentation to commonmark Open

Component:Doc

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#2010 · Opened Apr 5, 2023
[dv] Rip out old checking where needed in test suite Open

Component:DV Priority:P2

Difficulty 4/5 3-5 days Newbie friendliness 20/100

lowRISC/ibex#2005 · 1 comment · Opened Mar 23, 2023
[doc] Update configurations in README.md Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

lowRISC/ibex#1986 · Opened Feb 16, 2023
[rtl, doc] Consider hardening data_rvalid_i for 2-stage config Open

Component:Doc Component:RTL Type:Enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#1970 · Opened Jan 16, 2023
memory initialization Open

Type:Question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lowRISC/ibex#1965 · 2 comments · Opened Dec 22, 2022
[dv] Formally verify PMP functionality Open

Component:DV Priority:P3 Type:Enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

lowRISC/ibex#1963 · 1 comment · Opened Dec 8, 2022

lowRISC/ibex

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