Workaround the errata #181.

[coreboot.git] / src / mainboard / asus / m2v-mx_se / romstage.c

diff --git a/src/mainboard/asus/m2v-mx_se/romstage.c b/src/mainboard/asus/m2v-mx_se/romstage.c
index 580d8fa50acdfbfc01ecbf2887cbed99428cca23..9825e2bcfb68109dd7a73fd8d6702fcb278e7190 100644 (file)
--- a/src/mainboard/asus/m2v-mx_se/romstage.c
+++ b/src/mainboard/asus/m2v-mx_se/romstage.c
@@ -74,10 +74,15 @@ static inline int spd_read_byte(unsigned device, unsigned address)
 
 #define SB_VFSMAF 0
 
-/* this function might fail on some K8 CPUs with errata #181 */
 static void ldtstop_sb(void)
 {
        print_debug("toggle LDTSTP#\n");
+
+       /* fix errata #181, disable DRAM controller it will get enabled later */
+       u8 tmp = pci_read_config8(PCI_DEV(0, 0x18, 2), 0x94);
+       tmp |= (( 1 << 14) | (1 << 3));
+       pci_write_config8(PCI_DEV(0, 0x18, 2), 0x94, tmp);
+
        u8 reg = inb (VT8237R_ACPI_IO_BASE + 0x5c);
        reg = reg ^ (1 << 0);
        outb(reg, VT8237R_ACPI_IO_BASE + 0x5c);