Coreboot Is Ridding Its Need For Intel's FSP-T Blob
Written by Michael Larabel in Coreboot on 25 June 2021 at 03:45 PM EDT. 10 Comments
COREBOOT --
Coreboot making progress on its temporary RAM initialization code (cache as RAM) means that its usage of the FSP-T binary blob is increasingly unnecessary.

Thanks to work by consulting firm 9elements Cyber Security, it's now possible with Coreboot to get open-source cache as RAM (CAR) code working even if using Intel BootGuard. This working open-source code thereby makes Intel's FSP-T binary more redundant and thus can be avoided for an increasing amount of Intel hardware out there. FSP-T is still needed for some platforms like Skylake-SP, Cooperlake-SP, and Denverton-NS for FSP-T's other hardware initialization bits.


FSP-T is one part of the overall Intel Firmware Support Package (FSP) and primarily deals with temporary RAM initialization and on some platforms other early hardware initialization handling.

9elements wrote a blog post outlining their work on open-source cache as RAM handling while still having functionality like BootGuard working. Arthur Heymans of the firm concluded the post with, "The advantages of being in control of the execution environment are overwhelming. From personal experience on working with the Cooperlake SP platform, we did regularly hit issues with FSP-T. Sometimes those were bugs inside the FSP-T code that had to be worked around. On other occasions it was coreboot making assumptions on the bootflow that were not compatible with FSP being in control of the execution environment. I can firmly say that FSP-T causes more troubles than it actually solves, so having that code open sourced is the best strategy. We hope that by setting this good example with open source Bootguard support, others will be incentivised to not rely on FSP-T but pursue open source solutions."

Many free software enthusiasts continue longing for the day when modern Intel and AMD platforms -- and especially widely available desktop motherboards -- can work with Coreboot using a fully open-source stack.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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