bashrc

The two environment variables every tool in this repository assumes.

export PDK_ROOT=/opt/pdk/share/pdk
export PDK=sky130A

PDK_ROOT is the open_pdks install prefix, the directory that holds the sky130A/ tree with libs.tech and libs.ref. PDK names the process variant inside it.

Source it from your own ~/.bashrc, or copy the two lines:

source ~/path/to/tech_sky130A/bash/bashrc

The paths match the aicex container, where the PDK is installed under /opt/pdk. On a hand built toolchain the prefix is whatever was passed to open_pdks as --prefix (see tools_install.make, which suggests /usr/local/eda), so change PDK_ROOT to match.

Everything downstream depends on these:

magic/.magicrc sources $PDK_ROOT/sky130A/libs.tech/magic/sky130A.magicrc
xschem/xschemrc sources $PDK_ROOT/sky130A/libs.tech/xschem/xschemrc and uses $PDK to find the start window
make/core.make builds PDKPATH=${PDK_ROOT}/sky130A for the netgen setup and the KLayout DRC deck