implement io based udelay function for all mainboards that lack an apic

timer (or just failed otherwise due to missing udelay)


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2131 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/pc80/Config.lb

@@ -1,11 +1,16 @@
 uses CONFIG_IDE
 uses CONFIG_CONSOLE_VGA
+uses CONFIG_UDELAY_IO
 
 object mc146818rtc.o
 object isa-dma.o
 object i8259.o 
 #object udelay_timer2.o CONFIG_UDELAY_TIMER2
 
+if CONFIG_UDELAY_IO
+	object udelay_io.o
+end
+
 if CONFIG_IDE
 	dir ide
 end

src/pc80/udelay_io.c

@@ -0,0 +1,9 @@
+#include <arch/io.h>
+
+void udelay(int usecs)
+{
+	int i;
+	for(i = 0; i < usecs; i++)
+		outb(i&0xff, 0x80);
+}
+