diff --git a/dv/formal/Makefile b/dv/formal/Makefile
index cabb5afd..3bd8093e 100644
--- a/dv/formal/Makefile
+++ b/dv/formal/Makefile
@@ -2,7 +2,7 @@ IBEX_ROOT=../..
 
 SAIL=sail
 
-SAIL_RISCV_MODEL_DIR=../sail-riscv/model
+SAIL_RISCV_MODEL_DIR=${LOWRISC_SAIL_RISCV_SRC}/model
 
 include Sources.mk
 
@@ -48,3 +48,20 @@ sv:
 psgen:
 	mkdir -p build
 	psgen $(addprefix -path ,$(PSGEN_SRCS)) $(PSGEN_FLAGS) -sv-out build/psgen.sv -tcl-out build/psgen.tcl
+
+.PHONY: jg
+jg: fusesoc psgen sv
+	jg verify.tcl -allow_unsupported_OS -acquire_proj
+
+# The following default target is intended for regressions / unattended runs.
+.PHONY: all
+all: fusesoc psgen sv
+	jg verify.tcl -allow_unsupported_OS -acquire_proj -no_gui --- "prove_no_liveness"
+
+################################################################################
+
+.PHONY: clean
+clean:
+	rm -rf build/
+	rm -rf jgproject/
+	rm -rf jgproofs/
diff --git a/dv/formal/README.md b/dv/formal/README.md
index da43e7c3..02cf033b 100644
--- a/dv/formal/README.md
+++ b/dv/formal/README.md
@@ -1,16 +1,71 @@
-# End to End Formal Verification against the Sail
+# End-to-End Formal Verification of Ibex Trace Equivalence against the Sail Model
 
-Prerequisities (in your PATH):
-- [The lowRISC fork of the Sail compiler](https://github.com/lowRISC/sail/tree/lowrisc)
-- [psgen](https://github.com/mndstrmr/psgen)
+## Building & Running the flow
+
+Prerequisites:
+- Nix (`https://zero-to-nix.com/start/install`)
+- Cadence Jasper
+  If Jasper is not found on you PATH, `nix develop` will refuse to enter the development shell.
+
+Getting started:
+- Clone this repository
+- `cd dv/formal`
+
+### Reproducible Build
+
+This flow is intended for users who wish to run the formal flow as-is using the pinned external dependencies (psgen, sail, riscv-sail etc.)
 
 Build instructions:
-- `make fusesoc` fetches the necessary RTL using the Fusesoc tool, and makes a local copy inside `build/`. This also creates a filelist (`.scr`) that Jasper knows how to ingest.
-  - This step also patches the Ibex RTL with the changes described [in the section below](#rtl-changes).
+- `nix develop .#formal`
+- `make` invokes Jasper in batch-mode, and attempts to prove everything, which is meant for regressions.
+- `make jg` invokes Jasper interactively, halting after sourcing the contents of `verify.tcl`.
+
+After `make jg`, Jasper should start up and should execute the commands in the TCL file.
+You can see the different steps of the proof in the `Task Tree` tab.
+Then, you can prove each step in order by right clicking on them and clicking `Prove Task`.
+Some tasks may take longer than others and you can select specific properties in the `Property Table` and prove them individually by right clicking and selecting `Prove Property`.
+Some steps require a lot of RAM and CPU so we recommend closing any other resource-heavy programs running on your computer.
+A machine with 128 GiB of RAM and 32 cores was used to complete the proof.
+To avoid manually running each step you can also use the `prove_lemmas` command inside the TCL command interface located below your session window.
+
+### Development Builds
+
+Users who wish to do development on this flow should use the below steps.
+This will allow changes to both the local files and the external dependencies (psgen, sail, riscv-sail), and to run the intermediate build steps manually.
+
+Build instructions:
+- Identical to the Reproducible Build steps, but use `nix develop .#formal-dev`.
+
+Invoking `make jg` using the provided makefile would run the following steps, which can also be executed manually:
+- `make fusesoc` fetches the necessary RTL using the FuseSoC tool and makes a local copy inside `build/`.
+  This also creates a filelist (`.scr`) that Jasper knows how to ingest.
+  This step also patches the Ibex RTL with the changes described [in the section below](#rtl-changes).
 - `make psgen` to build the SV for the proofs given in `thm/`
-- `make sv` to build the SV translation of the Sail compiler. Will invoke `buildspec.py`, which can be configured to adjust which instructions are defined. By default all of them are, this is correct but slow.
-- Make the changes to Ibex described in the RTL changes.
-- `SAIL_DIR=<path to sail compiler source> jg verify.tcl`
+- `make sv` to build the SV translation of the Sail compiler.
+  Will invoke `buildspec.py`, which can be configured to adjust which instructions are defined.
+  By default all of them are, this is correct but slow.
+- `jg verify.tcl` invokes Jasper interactively, sourcing the configuration & run script.
+  Requires the above two steps to be executed first.
+
+Local versions of the external dependencies can be modified and linked into the build via Environment Variables as follows:
+- psgen: (`https://github.com/mndstrmr/psgen`)
+  - Clone the repository to a local directory \<psgen-dir\> : `git clone https://github.com/mndstrmr/psgen`
+  - Make local changes...
+  - Build in place with `nix develop --command bash -c "go build"`
+  - In the formal-dev shell:
+    - Add new psgen binary to head of path with `export PATH=<psgen-dir>:$PATH`
+- lowRISC Sail: (`https://github.com/lowrisc/sail` on the `lowrisc` branch).
+  - Clone the repository to a local directory \<sail-dir\> : `git clone --branch lowrisc https://github.com/lowrisc/sail`
+  - Make local changes...
+  - Build in place with `nix develop github:lowrisc/ibex#lowrisc_sail --command bash -c "dune build --release && dune install --prefix ."`
+  - In the formal-dev shell:
+    - Add new Sail binary to head of path with `export PATH=<sail-dir>/bin:$PATH`
+    - Update `LOWRISC_SAIL_SRC` to point to the source root with `export LOWRISC_SAIL_SRC=<sail-dir>`.
+- sail-riscv: (`https://github.com/lowrisc/sail-riscv`)
+  - Clone the repository to a local directory \<sail-riscv-dir\> (`git clone https://github.com/lowrisc/sail-riscv`).
+  - Make local changes...
+  - In the formal-dev shell:
+    - Update `LOWRISC_SAIL_RISCV_SRC` to point to the source root with `export LOWRISC_SAIL_RISCV_SRC=<sail-riscv-dir>`.
 
 ## Conclusivity
 All properties are currently known to be conclusive, with the exception of M-Types. The later stages (Memory, Top, RegMatch and Wrap and some Liveness) generally take longer.
diff --git a/dv/formal/poetry.lock b/dv/formal/poetry.lock
new file mode 100644
index 00000000..a58e179b
--- /dev/null
+++ b/dv/formal/poetry.lock
@@ -0,0 +1,520 @@
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+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-musllinux_1_2_i686.whl", hash = "sha256:faefcc78f53a88f3076b7f8be0a8f8d35133a3ecf7f3770895c25f8813460f08"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-musllinux_1_2_x86_64.whl", hash = "sha256:5b4f105deeffa28bbcdff6c49b34e74903139afa690e35d2d9e3c2c2fba18cec"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:fdfc3a892927458d98f3d55428ae46b921d1f7543b89382fdb483f5640daaec8"},
+    {file = "rpds_py-0.20.0.tar.gz", hash = "sha256:d72a210824facfdaf8768cf2d7ca25a042c30320b3020de2fa04640920d4e121"},
+]
+
+[[package]]
+name = "simplesat"
+version = "0.8.2"
+description = "Simple SAT solvers for use in Enstaller"
+optional = false
+python-versions = "*"
+files = [
+    {file = "simplesat-0.8.2-py2.py3-none-any.whl", hash = "sha256:76dd637db54c998badb988baafbc2bd4cc6689364580588487bc2634a6ab55fd"},
+    {file = "simplesat-0.8.2.tar.gz", hash = "sha256:1943f32735b03b048e20953a0145b2b61d2eb7a9dcc471a74f214afe9fa8d858"},
+]
+
+[package.dependencies]
+attrs = ">=17.4.0"
+okonomiyaki = ">=0.16.6"
+six = ">=1.10.0"
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+
+[[package]]
+name = "wheel"
+version = "0.41.2"
+description = "A built-package format for Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "wheel-0.41.2-py3-none-any.whl", hash = "sha256:75909db2664838d015e3d9139004ee16711748a52c8f336b52882266540215d8"},
+    {file = "wheel-0.41.2.tar.gz", hash = "sha256:0c5ac5ff2afb79ac23ab82bab027a0be7b5dbcf2e54dc50efe4bf507de1f7985"},
+]
+
+[package.extras]
+test = ["pytest (>=6.0.0)", "setuptools (>=65)"]
+
+[[package]]
+name = "zipfile2"
+version = "0.0.12"
+description = "An improved ZipFile class."
+optional = false
+python-versions = "*"
+files = [
+    {file = "zipfile2-0.0.12-py2.py3-none-any.whl", hash = "sha256:b9adf577d825461480e485027116c035f666b72ac3911af71aa93da6e0579eb8"},
+    {file = "zipfile2-0.0.12.tar.gz", hash = "sha256:7376f7c968717ac895ef862da913e790cf1b518caf56c4822c04684c46a8a608"},
+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "77df0bf8de469f836b38ed006e00b9e70ed430601f2561999dd41b83ea5a22d6"
diff --git a/dv/formal/pyproject.toml b/dv/formal/pyproject.toml
new file mode 100644
index 00000000..bb77bc62
--- /dev/null
+++ b/dv/formal/pyproject.toml
@@ -0,0 +1,26 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+[tool.poetry]
+name = "ibex"
+version = "0.0.0"
+description = "Ibex"
+authors = []
+license = "Apache 2.0"
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.10"
+packaging = "23.1"
+anytree = "2.8.0"
+hjson = "3.1.0"
+mako = "1.1.6"
+pyyaml = "6.0"
+wheel = "0.41.2"
+edalize = { git = "https://github.com/lowRISC/edalize.git", tag = "v0.4.0"}
+fusesoc = { git = "https://github.com/lowRISC/fusesoc.git", tag = "ot-0.4" }
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..06df5897
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,378 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gomod2nix": {
+      "inputs": {
+        "flake-utils": [
+          "psgen",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "psgen",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1717050755,
+        "narHash": "sha256-C9IEHABulv2zEDFA+Bf0E1nmfN4y6MIUe5eM2RCrDC0=",
+        "owner": "tweag",
+        "repo": "gomod2nix",
+        "rev": "31b6d2e40b36456e792cd6cf50d5a8ddd2fa59a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tweag",
+        "repo": "gomod2nix",
+        "type": "github"
+      }
+    },
+    "lowrisc-nix": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "poetry2nix": "poetry2nix",
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1724163813,
+        "narHash": "sha256-jdVhaKwR39AqQcSIe2euQkZwsu88qRcjsehO57tchVA=",
+        "owner": "lowrisc",
+        "repo": "lowrisc-nix",
+        "rev": "7412a5a201df3e5837b42a9b831bdf5bb9105a3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "repo": "lowrisc-nix",
+        "type": "github"
+      }
+    },
+    "lowrisc_sail": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1745587367,
+        "narHash": "sha256-VbUampJQcjgnCi/9rRSC0V13i/MLBS75sfRrrc/HLpc=",
+        "owner": "lowrisc",
+        "repo": "sail",
+        "rev": "4832414fca03b3103121a15a021939654050159b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "ref": "lowrisc",
+        "repo": "sail",
+        "type": "github"
+      }
+    },
+    "lowrisc_sail_riscv": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1722338144,
+        "narHash": "sha256-ALWgTa/AxCnHJlK/RSZ6856xK2lwHc6CzHGtf4d8C0s=",
+        "owner": "lowrisc",
+        "repo": "sail-riscv",
+        "rev": "81a266b6f65365b34180af7b91708265da653878",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "ref": "81a266b6f65365b34180af7b91708265da653878",
+        "repo": "sail-riscv",
+        "type": "github"
+      }
+    },
+    "mkshell-minimal": {
+      "locked": {
+        "lastModified": 1700988624,
+        "narHash": "sha256-KJyiF67zVYOBkNltKhJATfSj+gfRFX9dSFIWDEBy2nQ=",
+        "owner": "viperML",
+        "repo": "mkshell-minimal",
+        "rev": "6b0868be06da900b5fe6ece05616b84e3cbd7944",
+        "type": "github"
+      },
+      "original": {
+        "owner": "viperML",
+        "repo": "mkshell-minimal",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1703863825,
+        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nix-github-actions_2": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1703863825,
+        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1724316499,
+        "narHash": "sha256-Qb9MhKBUTCfWg/wqqaxt89Xfi6qTD3XpTzQ9eXi3JmE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "797f7dc49e0bc7fab4b57c021cdf68f595e47841",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.05",
+        "type": "indirect"
+      }
+    },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": [
+          "lowrisc-nix",
+          "flake-utils"
+        ],
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "lowrisc-nix",
+          "nixpkgs"
+        ],
+        "systems": "systems_2",
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1723854676,
+        "narHash": "sha256-+BrHfNuXrqeE7PoV6xDaoh0joYiJkvTTCIV0fFR3THw=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "d650118bce34c0238b9b54f23f7f173f9e4db867",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "poetry2nix_2": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nix-github-actions": "nix-github-actions_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems_3",
+        "treefmt-nix": "treefmt-nix_2"
+      },
+      "locked": {
+        "lastModified": 1724417163,
+        "narHash": "sha256-gD0N0pnKxWJcKtbetlkKOIumS0Zovgxx/nMfOIJIzoI=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "7619e43c2b48c29e24b88a415256f09df96ec276",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "psgen": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "gomod2nix": "gomod2nix",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1723038779,
+        "narHash": "sha256-L/toJC6lyeVJy2Uswse8aCrhdt0mTxDfn8t0NpNVn/I=",
+        "owner": "mndstrmr",
+        "repo": "psgen",
+        "rev": "2d0c1e0690cf6c3b9b1bf4f51bccab4698f4e21f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mndstrmr",
+        "repo": "psgen",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "lowrisc-nix": "lowrisc-nix",
+        "lowrisc_sail": "lowrisc_sail",
+        "lowrisc_sail_riscv": "lowrisc_sail_riscv",
+        "mkshell-minimal": "mkshell-minimal",
+        "nixpkgs": "nixpkgs",
+        "poetry2nix": "poetry2nix_2",
+        "psgen": "psgen"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1724034091,
+        "narHash": "sha256-b1g7w0sw+MDAhUAeCoX1vlTghsqcDZkxr+k9OZmxPa8=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "c7d36e0947826e0751a5214ffe82533fbc909bc0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1719749022,
+        "narHash": "sha256-ddPKHcqaKCIFSFc/cvxS14goUhCOAwsM1PbMr0ZtHMg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "8df5ff62195d4e67e2264df0b7f5e8c9995fd0bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
+    "treefmt-nix_2": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1719749022,
+        "narHash": "sha256-ddPKHcqaKCIFSFc/cvxS14goUhCOAwsM1PbMr0ZtHMg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "8df5ff62195d4e67e2264df0b7f5e8c9995fd0bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..6540f909
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,146 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+{
+  description = "Nix Flake for Ibex development and testing.";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-24.05";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    poetry2nix = {
+      url = "github:nix-community/poetry2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+    mkshell-minimal.url = "github:viperML/mkshell-minimal";
+
+    lowrisc-nix = {
+      url = "github:lowrisc/lowrisc-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+
+    psgen = {
+      url = "github:mndstrmr/psgen";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+    lowrisc_sail = {
+      url = "github:lowrisc/sail?ref=lowrisc";
+      flake = false;
+    };
+    lowrisc_sail_riscv = {
+      url = "github:lowrisc/sail-riscv?ref=81a266b6f65365b34180af7b91708265da653878";
+      flake = false;
+    };
+  };
+
+  # The lowRISC public nix-cache contains builds of nix packages used by lowRISC, primarily coming from github:lowRISC/lowrisc-nix.
+  nixConfig = {
+    extra-substituters = ["https://nix-cache.lowrisc.org/public/"];
+    extra-trusted-public-keys = ["nix-cache.lowrisc.org-public-1:O6JLD0yXzaJDPiQW1meVu32JIDViuaPtGDfjlOopU7o="];
+  };
+
+  outputs = inputs@{self, ...}:
+    let
+
+      # System types to support.
+      supportedSystems = with inputs.flake-utils.lib.system; [
+        x86_64-linux
+      ];
+
+    in inputs.flake-utils.lib.eachSystem supportedSystems (system:
+      let
+
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+        };
+        inherit (pkgs) lib;
+
+        mkshell-minimal = inputs.mkshell-minimal pkgs;
+
+        # lowRISC fork of the Sail repository. The SAIL -> SV flow is used to generate the reference model.
+        lowrisc_sail = import ./nix/lowrisc_sail.nix {
+          inherit pkgs;
+          src = inputs.lowrisc_sail;
+        };
+
+        # Sail RISC-V model with changes for Ibex
+        lowrisc_sail_riscv.src = (import ./nix/lowrisc_sail_riscv.nix {
+          inherit pkgs;
+          src = inputs.lowrisc_sail_riscv;
+        }).src;
+
+        # Create a python package set suitable for the formal flow
+        # - The file dv/formal/pyproject.toml defines the package set for this environment
+        # - Using the fusesoc .core files in this repo requires a lowrisc-fork of fusesoc, so this
+        #   file specifies the forked repository. Most other python package dependencies are in
+        #   support of fusesoc.
+        formal_python_env = let
+          poetry2nix = inputs.poetry2nix.lib.mkPoetry2Nix {inherit pkgs;};
+          lowriscPoetryOverrides = inputs.lowrisc-nix.lib.poetryOverrides {inherit pkgs;};
+        in
+          poetry2nix.mkPoetryEnv {
+            projectDir = ./dv/formal;
+            overrides = [
+              poetry2nix.defaultPoetryOverrides
+              lowriscPoetryOverrides
+            ];
+          };
+
+        in {
+          packages = {
+            # Export the package for the lowrisc fork of the sail compiler. This allows us
+            # to re-use its build environment when using the .#formal-dev flow.
+            inherit lowrisc_sail;
+          };
+          devShells = rec {
+            formal = mkshell-minimal {
+              packages = [
+                inputs.psgen.packages.${system}.default
+                lowrisc_sail
+                formal_python_env
+              ] ++ (with pkgs; [
+                gnumake
+                patch
+              ]);
+              shellHook = let
+                # The formal environment has an untracked external requirement on Cadence Jasper.
+                # Add a check here which will prevent launching the devShell if Jasper is not found on the user's path.
+                # TODO: Is this robust? Do we want to check available features?
+                check_jg = ''
+                  if ! command -v jg &>/dev/null; then
+                    echo "Jasper not found on path. Not launching devShell."
+                    exit 1
+                  fi
+                '';
+              in ''
+                ${check_jg}
+                # The following environment variables are used by the formal build scripts to pick up the locations
+                # of the external source-file dependencies.
+                # The can be re-exported manually for development (see .#formal-dev)
+                export LOWRISC_SAIL_SRC=${lowrisc_sail.src}
+                export LOWRISC_SAIL_RISCV_SRC=${lowrisc_sail_riscv.src}
+              '';
+            };
+
+            formal-dev = formal.overrideAttrs (prev: {
+              shellHook = prev.shellHook + ''
+                cat << EOF
+                ========================================================================================
+                This is the development shell. By default it is identical to the .#formal shell.
+                In order to use dev dependencies (e.g. psgen or Sail), prepend the new binaries to PATH:
+                  export PATH=<bindir>:\$PATH
+                If developing the Sail sources, also update LOWRISC_SAIL_SRC:
+                  export LOWRISC_SAIL_SRC=<dirname>
+                To use a local version of Ibex's sail-riscv model, also update LOWRISC_SAIL_RISCV_SRC:
+                  export LOWRISC_SAIL_RISCV_SRC=<dirname>
+                ========================================================================================
+                EOF
+              '';
+            });
+          };
+        }
+    );
+}
diff --git a/nix/lowrisc_sail.nix b/nix/lowrisc_sail.nix
new file mode 100644
index 00000000..3285e8c6
--- /dev/null
+++ b/nix/lowrisc_sail.nix
@@ -0,0 +1,23 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+# Override the upstream sail package definition to use the lowRISC fork
+{
+  pkgs,
+  src,
+}:
+
+pkgs.ocamlPackages.sail.overrideAttrs (prev: {
+  pname = "lowrisc_sail";
+  inherit src;
+
+  # The lowRISC fork is older than upstream, and requires additional dependencies
+  # from those specified upsteam to build. Add them here.
+  propagatedBuildInputs =
+    prev.propagatedBuildInputs ++ (with pkgs.ocamlPackages; [
+      menhirLib
+    ]) ++ (with pkgs; [
+      z3
+    ]);
+})
diff --git a/nix/lowrisc_sail_riscv.nix b/nix/lowrisc_sail_riscv.nix
new file mode 100644
index 00000000..34f481fb
--- /dev/null
+++ b/nix/lowrisc_sail_riscv.nix
@@ -0,0 +1,18 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+# RISCV Sail model with changes for Ibex
+{
+  pkgs,
+  src,
+}:
+
+pkgs.sail-riscv-rv32.overrideAttrs {
+  pname = "lowrisc_sail_riscv";
+  inherit src;
+
+  # The upstream patches does not apply to our older version of riscv_sail.
+  patches = [ ];
+}
+