If you boot a 64-bit kernel on an ARMv8-A platform, you’ll probably notice some output relating to PSCI. In this post, we’re going to explore what this is and why it’s there. The Power State Coordination Interface (PSCI) is an ARM standard that describes a software interface for power management between an operating system (not …
Tag: SMC
Booting Linux from Linux with kexec
The Linux kernel feature known as ‘kexec‘ allows you to boot from the currently running kernel into a new kernel – effectively turning a Linux distribution into a feature-rich bootloader. This shouldn’t be confused with virtualisation technologies that allow you to run Linux as a guest. This capability has been around since 2005 (2.6.13) and …