Introduction: A command line tool wrapping around ioperm(2) iopl(2) outb(2), etc.
Where it is needed: Designed for Linux-as-bootloader-payload schemes like Heads, in order to perform low-level IO operations, e.g. triggering SMIs.
A bit more information on Hardened Linux’s use of CHIPSEC, in this case coreboot-centric:
“# Enabling some security features at runtime in case of which vendor provided implementation improperly.”
There aren’t many CHIPSEC-based codebases, Hardened Linux is one relatively new one.