Libreboot is a distribution of coreboot “aimed at replacing the proprietary BIOS firmware contained by most computers.”
So then what exactly is GNU Boot? Its home page explains…
In November 2022, Libreboot began to include non-libre code. We have made repeated efforts to continue collaboration with those developers to help their version of Libreboot remain libre, but that was not successful. Now we’ve stepped forward to stand up for freedom, ours and that of the wider community, by maintaining our own version — a genuinely libre Libreboot, that after some hurdles gave birth to this project: GNU Boot.
But today, Phoronix writes:
While priding itself on being “100% free”, last December [GNU Boot] had to drop some motherboard support and CPU code after discovering they were shipping some files that are non-free by their free software standards. Today they announced another mistake in having inadvertently been shipping additional non-free code.
GNU Boot discovered an issue with non-free code affecting not only them but also some of the Linux distributions that pride themselves on being fully free software / 100% open-source. This latest snafu they say is “more problematic” than their prior non-free code discover due to impacting the free software Linux distributions too. The issue at hand though comes down to test data contained within the archive and that containing non-free code in the form of microcode, BIOS bits, and Intel Management Engine firmware.
“We also contacted Replicant…” according to the announcement, “a free Android distro that also ships vboot source code.” And in addition, “We had to re-release all the affected tarballs.” (Which at this point is three release candidates…)