sandbox: Add main program

Add a main program so that we can run U-Boot.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/Makefile

@@ -30,7 +30,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(CPU).o
 
-COBJS	:= cpu.o os.o
+COBJS	:= cpu.o start.o os.o
 
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))

arch/sandbox/cpu/start.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+int main(int argc, char *argv[])
+{
+	/*
+	 * Do pre- and post-relocation init, then start up U-Boot. This will
+	 * never return.
+	 */
+	board_init_f(0);
+
+	return 0;
+}