CoCo firmware is stateless, so Secure Boot keys cannot be enrolled at runtime: it only enforces Secure Boot with keys baked in at build time, refusing unsigned images from the first boot. The default exclusion of the enrolled-keys firmware feature hence keeps unsigned images bootable, but it also makes firmware discovery fail on distros that only ship SNP/TDX firmware with pre-enrolled keys (e.g. Fedora's TDVF). Drop the rejection of --secure-boot=yes with --coco= and instead treat it as an opt-in to such firmware, by lifting the enrolled-keys exclusion. While at it, reject --efi-nvram-template= and an explicit --efi-nvram-state= path with --coco=, which were silently ignored, as stateless firmware has no NVRAM to instantiate or persist. Signed-off-by: Paul Meyer <katexochen0@gmail.com>
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