sparc64: Faster early-boot framebuffer console.

Borrow the powerpc bootx text console driver.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/Kconfig

@@ -221,6 +221,13 @@ config SPARC64_SMP
 	default y
 	depends on SPARC64 && SMP
 
+config EARLYFB
+	bool "Support for early boot text console"
+	default y
+	depends on SPARC64
+	help
+	  Say Y here to enable a faster early framebuffer boot console.
+
 choice
 	prompt "Kernel page size" if SPARC64
 	default SPARC64_PAGE_SIZE_8KB

arch/sparc/include/asm/btext.h

+#ifndef _SPARC_BTEXT_H
+#define _SPARC_BTEXT_H
+
+extern int btext_find_display(void);
+
+#endif /* _SPARC_BTEXT_H */

arch/sparc/kernel/Makefile

@@ -87,6 +87,7 @@ obj-$(CONFIG_KGDB)        += kgdb_$(BITS).o
 obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
 CFLAGS_REMOVE_ftrace.o := -pg
 
+obj-$(CONFIG_EARLYFB) += btext.o
 obj-$(CONFIG_STACKTRACE)     += stacktrace.o
 # sparc64 PCI
 obj-$(CONFIG_SPARC64_PCI)    += pci.o pci_common.o psycho_common.o

arch/sparc/kernel/setup_64.c

@@ -46,6 +46,7 @@
 #include <asm/setup.h>
 #include <asm/mmu.h>
 #include <asm/ns87303.h>
+#include <asm/btext.h>
 
 #ifdef CONFIG_IP_PNP
 #include <net/ipconfig.h>
@@ -286,7 +287,10 @@ void __init setup_arch(char **cmdline_p)
 	parse_early_param();
 
 	boot_flags_init(*cmdline_p);
-	register_console(&prom_early_console);
+#ifdef CONFIG_EARLYFB
+	if (btext_find_display())
+#endif
+		register_console(&prom_early_console);
 
 	if (tlb_type == hypervisor)
 		printk("ARCH: SUN4V\n");