x86, earlyprintk: Add earlyprintk for Intel Moorestown platform

Browse source

Intel Moorestown platform has a spi-uart device(Maxim3110),
which connects to a Designware spi core controller. This patch
will add early console function based on it.

As it will be used long before Linux spi subsystem get
initialised, we simply directly manipulate the spi controller's
register to acheive the early console func. This is safe as it
will be disabled when devices subsytem get initialised.

To use it, user need enable CONFIG_X86_MRST_EARLY_PRINTK in
kenrel config and add "earlyprintk=mrst" in kernel command line.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: greg@kroah.com
LKML-Reference: <1284361736-23011-4-git-send-email-feng.tang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Feng Tang 2010-09-13 15:08:55 +08:00 • committed by Ingo Molnar

parent 5a47c7dae8

commit c20b5c3318

5 changed files with 249 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

arch/x86/Kconfig.debug

View file

5

arch/x86/include/asm/mrst.h

View file

1

arch/x86/kernel/Makefile

View file

7

arch/x86/kernel/early_printk.c

View file

232

arch/x86/kernel/early_printk_mrst.c

View file