x86, earlyprintk: Add hsu early console for Intel Medfield platform

Intel Medfield platform has a high speed UART device, which
could act as a early console. To enable early printk of HSU
console, simply add "earlyprintk=hsu" in kernel command line.

Currently we put the code in the early_printk_mrst.c as it is
also for Intel MID platforms like the mrst early console

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: greg@kroah.com
LKML-Reference: <1284361736-23011-5-git-send-email-feng.tang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index 6082463768a2..4572f25f9325 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -245,6 +245,12 @@ static int __init setup_early_printk(char *buf)
                         mrst_early_console_init();
                         early_console_register(&early_mrst_console, keep);
                 }
+
+                if (!strncmp(buf, "hsu", 3)) {
+                        hsu_early_console_init();
+                        early_console_register(&early_hsu_console, keep);
+                }
+
 #endif
                 buf++;
         }