⛰️ Volare

Volare is a version manager (and builder) for builds of Google open-source PDKs using open_pdks.

Requirements

• Python 3.8+ with PIP
• macOS or GNU/Linux

macOS

Get Homebrew then:

brew install python3

Debian and Ubuntu

Debian 11+ or Ubuntu 20.04+ is required.

sudo apt-get update
sudo apt-get install python3 python3-pip xz-utils

RHEL and Derivatives

RHEL 8+ or compatible operating system required.

sudo yum install -y python3 python3-pip

Installation and Upgrades

# To install (or upgrade)
python3 -m pip install --user --upgrade --no-cache-dir volare

# To verify it works
volare --version

About the builds

In its current inception, volare supports builds of sky130 and gf180mcu PDKs using Open_PDKs, including the following libraries:

All builds are identified by their open_pdks commit hash.

Usage

Volare requires a so-called PDK Root. This PDK root can be anywhere on your computer, but by default it's the folder ~/.volare in your home directory. If you have the variable PDK_ROOT set, volare will use that instead. You can also manually override both values by supplying the --pdk-root commandline argument.

Listing All Available PDKs

To list all available pre-built PDKs hosted in this repository, you can just invoke volare ls-remote --pdk <PDK>. If you omit the --pdk argument, sky130 will be used as a default.

$ volare ls-remote --pdk sky130
Pre-built sky130 PDK versions
├── 44a43c23c81b45b8e774ae7a84899a5a778b6b0b (2022.08.16) (enabled)
├── e8294524e5f67c533c5d0c3afa0bcc5b2a5fa066 (2022.07.29) (installed)
├── 41c0908b47130d5675ff8484255b43f66463a7d6 (2022.04.14) (installed)
├── 660c6bdc8715dc7b3db95a1ce85392bbf2a2b195 (2022.04.08)
├── 5890e791e37699239abedfd2a67e55162e25cd94 (2022.04.06)
├── 8fe7f760ece2bb49b1c310e60243f0558977dae5 (2022.04.06)
└── 7519dfb04400f224f140749cda44ee7de6f5e095 (2022.02.10)

$ volare ls-remote --pdk gf180mcu
Pre-built gf180mcu PDK versions
└── 120b0bd69c745825a0b8b76f364043a1cd08bb6a (2022.09.22)

It includes a commit hash, which is the open_pdks version used to build this particular PDK, the date that this commit was created, and whether you already installed this PDK and/or if it is the currently enabled PDK.

Listing Installed PDKs

Typing volare ls --pdk <pdk> in the terminal shows you your PDK Root and the PDKs you currently have installed. Again, if you omit the --pdk argument, sky130 will be used as a default.

$ volare ls --pdk sky130
/home/test/volare/sky130/versions
├── 44a43c23c81b45b8e774ae7a84899a5a778b6b0b (2022.08.16) (enabled)
├── e8294524e5f67c533c5d0c3afa0bcc5b2a5fa066 (2022.07.29)
└── 41c0908b47130d5675ff8484255b43f66463a7d6 (2022.04.14)

(If you're not connected to the Internet, the release date of the commit will not be included.)

Downloading and Enabling PDKs

You can enable a particular sky130 PDK by invoking volare enable --pdk <pdk> <open_pdks commit hash>. This will automatically download that particular version of the PDK, if found, and set it as your currently used PDK.

For example, to activate a build of sky130 using open_pdks 7519dfb04400f224f140749cda44ee7de6f5e095, you invoke volare enable --pdk sky130 7519dfb04400f224f140749cda44ee7de6f5e095, as shown below:

$ volare enable --pdk sky130 7519dfb04400f224f140749cda44ee7de6f5e095
Downloading pre-built tarball for 7519dfb04400f224f140749cda44ee7de6f5e095… ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
Unpacking…                                                                  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
PDK version 7519dfb04400f224f140749cda44ee7de6f5e095 enabled.

What's more is: if you're using a repository with a tool_metadata.yml file, such as OpenLane or DFFRAM, you can just invoke volare enable --pdk sky130 without the commit hash and Volare will automatically extract the version required by the utility. Once again, if you omit the --pdk argument, sky130 will be used as a default.

Building PDKs

For special cases, you may have to build the PDK yourself, which Volare does support.

You'll need Magic installed and in PATH. You can either do that manually or, if you have Nix, invoke nix shell github:efabless/openlane2#magic before building.

You can invoke volare build --help for more options. Be aware, the built PDK won't automatically be enabled and you'll have to volare enable the appropriate version.

License

The Apache License, version 2.0. See 'License'.