Eltan Slim Bootloader (SBL)
Eltan Slim Bootloader is a modern bootloader for the Intel processors and is based on the Intel Slim Bootloader (SBL) and FSP 2.0.
Eltan Slim Bootloader
Eltan Slim Bootloader is designed to be:
The following security features are supported:
• Measured boot
• Verified Boot
• Secure flash update
Slim Bootloader uses a layered model. The actual Slim Bootloader layer takes care of the system initialization. On top of this payloads are supported to provide the desired functionality.
Slim Bootloader can securely boot a hypervisor or operating system using IAS images (Intel Automotive Service image format). Tools are provided to create those images. This will simply launch the OS without providing runtime support to the OS.
In addition Slim Bootloader also supports a TianoCore payload in order to boot operating systems that require UEFI and UEFI secure boot.
Other payloads will be made available and it is possible to add custom payload or use LinuxBoot as a payload on top of Slim Bootloader.
Updating the Slim Bootloader firmware is performed in a secure way using signed capsules.
Slim Bootloader contains a small, extensible shell that can be used for debugging and diagnosing purposes. It can be left out easily to save space or prevent security issues.
Eltan Slim Bootloader uses the EDK II build system used in TianoCore and can use TianoCore libraries. Because of this existing libraries can be reused easily and libraries that are developed can be reused in the TianoCore payload or even in a full UEFI BIOS without an issue. So duplicate development efforts can be prevented! Slim Bootloader is carrying a BSD license.
The first Eltan Slim Bootloader was implemented on the Intel Apollo Lake platform. Since then it is extended by other platforms supporting FSP 2.0.
Please contact Eltan for more information about the Eltan Slim Bootloader solution.
The image below provides a quick overview of the architecture.