tree e34f1b6232c302e39065f3dd7ef8bbf4c8ac3d3d
parent 589643be6693c46fbc54bae77745f336c8ed4bcc
author Pekka Enberg <penberg@cs.helsinki.fi> 1278835617 +0300
committer H. Peter Anvin <hpa@linux.intel.com> 1278971160 -0700

x86, setup: Early-boot serial I/O support

This patch adds serial I/O support to the real-mode setup (very early
boot) printf(). It's useful for debugging boot code when running Linux
under KVM, for example. The actual code was lifted from early printk.

Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <1278835617-11368-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>