x86: Implement panic output for coreboot

panic_puts() can be called in early boot to display a message. It might
help with early debugging.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index f8e28f0c82..4a7dae4936 100644
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -26,6 +26,7 @@
 #include <asm/u-boot-x86.h>
 #include <flash.h>
 #include <netdev.h>
+#include <ns16550.h>
 #include <asm/msr.h>
 #include <asm/cache.h>
 #include <asm/io.h>
@@ -135,3 +136,12 @@ int board_final_cleanup(void)
 
 	return 0;
 }
+
+void panic_puts(const char *str)
+{
+	NS16550_t port = (NS16550_t)0x3f8;
+
+	NS16550_init(port, 1);
+	while (*str)
+		NS16550_putc(port, *str++);
+}