U-Boot as PSCI provider on ARM64
- Track: Embedded, Mobile and Automotive devroom
- Room: UD2.120 (Chavanne)
- Day: Saturday
- Start: 15:00
- End: 15:25
- Video only: ud2120_chavanne
- Chat: Join the conversation!
OS kernel on embedded ARM64 systems requires PSCI interface to bring CPU cores up/down, suspend/resume/reset/power off. U-Boot bootloader provides a PSCI interface and this talk explains it.
The talk consists of five parts -- how the PSCI interface works, where and how OS kernel calls it, how and in which hooks on the bootloader side do those calls land, and how those hooks in U-Boot provide functionality required by OS. Last part is an example of U-Boot configured to provide PSCI interface on contemporary SoC .
The benefit of using the U-Boot PSCI interface over other PSCI interface providers is twofold. First, it allows for utilizing the full potential of U-Boot, and especially the SPL preloader, which can then boot OS kernel directly and quickly. Second, removing one software component from the boot stack reduces the Software BoM.
Speakers
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Marek Vasut |