This change allows us to see the spd on the s850, finally.

There is an i2c mux out there. We found it using a user level program 
that, as usual, began by inverting all gpios until we found out 
what we needed to know. In the end, we just set up the GPIOs as 
the factory bios does. 

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Myles Watson <mylesgw@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4755 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 20 insertions, 0 deletions

diff --git a/src/mainboard/dell/s1850/s1850_fixups.c b/src/mainboard/dell/s1850/s1850_fixups.c
index 77744d4d34..9827120056 100644
--- a/src/mainboard/dell/s1850/s1850_fixups.c
+++ b/src/mainboard/dell/s1850/s1850_fixups.c
@@ -33,6 +33,26 @@ static void mainboard_set_ich5(void)
 	 * we leave it enabled and visible in config space -- 8f66
 	 */
 	pci_write_config16(PCI_DEV(0, 0x1f, 0), 0xf2, 0x8f66);
+	/* GPIOs -- needed, possibly, for SPD */
+	pci_write_config32(PCI_DEV(0, 0x1f, 0), 0x58, 0x881);
+	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0x5c, 0x10);
+
+	/* now the fun begins ... enable the GPIOs as done on factory */
+	/* factory config from IO ports 
+	 * It has a few more things enabled than default!
+	 */
+	outl(0x1ae0f183, 0x880);
+	outl(0x1b00ffff, 0x884);
+	outl(0x131f0000, 0x88c);
+	outl(0x00000000, 0x894);
+	outl(0x00040000, 0x898);
+	outl(0x00000000, 0x8a4);
+	outl(0x00000000, 0x8a8);
+	outl(0x000031c0, 0x8ac);
+	outl(0x00000007, 0x8b0);
+	outl(0x00000304, 0x8b4);
+	outl(0x00030303, 0x8b8);
+
 }