tree 2eead15738f173ed08ecbedc88adbb0bf2937022
parent c158c3bf59951bbb44bd7ccca9e6665dfd1617c5
author Matt Fleming <matt.fleming@intel.com> 1380875816 +0100
committer Matt Fleming <matt.fleming@intel.com> 1382983798 +0000

x86/efi: Add EFI framebuffer earlyprintk support

It's incredibly difficult to diagnose early EFI boot issues without
special hardware because earlyprintk=vga doesn't work on EFI systems.

Add support for writing to the EFI framebuffer, via earlyprintk=efi,
which will actually give users a chance of providing debug output.

Cc: H. Peter Anvin <hpa@zytor.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Jones <pjones@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>