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x86, earlyprintk: Add earlyprintk for Intel Moorestown platform

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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
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4
arch/x86/Kconfig.debug
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@@ -43,6 +43,10 @@ config EARLY_PRINTK
with klogd/syslogd or the X server. You should normally N here,
unless you want to debug such a crash.
config EARLY_PRINTK_MRST
bool "Early printk for MRST platform support"
depends on EARLY_PRINTK && X86_MRST
config EARLY_PRINTK_DBGP
bool "Early printk via EHCI debug port"
depends on EARLY_PRINTK && PCI