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LIN6-7460 : Add EFI framebuffer earlyprintk support

Created: May 18, 2014    Updated: Dec 3, 2018
Resolved Date: May 25, 2014
Found In Version: 6.0
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: BSP - Async


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

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