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Intel Customer Support Technician
Projects like Coreboot and Slim bootlader mention they support a linux image as payload, however it is my understanding that this is a minimal image that will then require access to a mass media, like SD card, Hard drive or USB for a fully functional O.S. you can corroborate this in they respective support communities.
If you need a more specific information for your platform you will need to request access to Intel Priviledge Account, you can apply here: https://www.intel.com/content/www/us/en/forms/support/my-intel-sign-on-support.html.
For SBL related questions, please refer to the SBL community, you can find more information and support channels here: https://slimbootloader.github.io/introduction/index.html#frequently-asked-questions under the I need help...section.