![]() I would look at the Ubuntu operating system when considering Baytrail, as Fedora is yet to build their stock kernels with CONFIG_EFI_MIXED=y. This isn't an issue for the Baytrail tablets, as they use the Intel GPU. A x86-64 Linux kernel built with the option CONFIG_EFI_MIXED=y includes such a thunk to allow the x86-64 kernel to call to a i686 EFI.Īt this point in time there is no thunk for AMD's AtomBIOS, and thus the "radeon" module fails. Just like a 64b or 32b CPU processor calling into a traditional 16b BIOS, a thunk is needed in the operating system to marshal the arguments from 64b to 32b, change the processor mode, call the firmware, and then restore the processor mode and marshal the arguments from 32b to 64b. ![]() Grub2 (compiled for 32b EFI) will start a 64b UEFI operating system from a 32b EFI. The Baytrail tablets run a 64b processor and a 32b EFI, for reasons best known to Intel.
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