EFI framebuffer earlyprintk support is a new debug feature that allows users to debug early booting issues on EFI hardware. It adds support for writing to the EFI framebuffer,via earlyprintk=efi, which will actually give users a chance of debug output. It's incredibly difficult to diagnose early EFI boot issues without special hardware because earlyprintk=vga doesn't work on EFI systems. Currently the only method available requires special hardware, which most users don't have. Upstream done in v3.13 kernel: commit 72548e836b0c4abbb652e791dee9c91203a9a4c6 x86/efi: Add EFI framebuffer earlyprintk support
