--- grub-0.97.orig/stage2/builtins.c	2005-02-15 16:58:23.000000000 -0500
+++ grub-0.97/stage2/builtins.c	2009-05-04 21:05:56.000000000 -0400
@@ -49,6 +49,8 @@
 # include <md5.h>
 #endif
 
+#include "netboot/linux-asm-io.h"
+
 /* The type of kernel loaded.  */
 kernel_t kernel_type;
 /* The boot device.  */
@@ -3376,6 +3378,23 @@ static struct builtin builtin_savedefaul
 
 
 #ifdef SUPPORT_SERIAL
+
+#define CONFIG_CMD(bus, device_fn, where)   (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))
+
+static void pcibios_write_config_word (unsigned int bus, unsigned int device_fn,
+				unsigned int where, unsigned short value)
+{
+    outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
+    outw(value, 0xCFC + (where&2));
+}
+
+static void pcibios_write_config_dword (unsigned int bus, unsigned int device_fn,
+				unsigned int where, unsigned int value)
+{
+    outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
+    outl(value, 0xCFC);
+}
+
 /* serial */
 static int
 serial_func (char *arg, int flags)
@@ -3501,6 +3520,16 @@ serial_func (char *arg, int flags)
       arg = skip_to (0, arg);
     }
 
+    /* program 0x1060 to 06:02.0 BAR 0 */
+    pcibios_write_config_dword (0x06, 0x10, 0x10, 0x1060);
+    /* program 0x1068 to 06:02.1 BAR 0 */
+    pcibios_write_config_dword (0x06, 0x11, 0x10, 0x1068);
+
+    /* enable I/O Space for 06:02.0 */
+    pcibios_write_config_word (0x06, 0x10, 0x04, 0x0401);
+    /* enable I/O Space for 06:02.1 */
+    pcibios_write_config_word (0x06, 0x11, 0x04, 0x0401);
+
   /* Initialize the serial unit.  */
   if (! serial_hw_init (port, speed, word_len, parity, stop_bit_len))
     {