[coreboot] [commit] r6066 - trunk/src/mainboard/asus/m2v
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svn at coreboot.org
Fri Nov 12 21:46:03 CET 2010
Author: stuge
Date: Fri Nov 12 21:46:02 2010
New Revision: 6066
URL: https://tracker.coreboot.org/trac/coreboot/changeset/6066
Log:
mainboard/asus/m2v: Set DDR2 voltage to 1.8V
The power-on default is 1.95V, set the DDR2 voltage to
standards-conforming 1.8V.
I also measured with a multimeter to confirm this.
Signed-off-by: Tobias Diedrich <ranma+coreboot at tdiedrich.de>
Acked-by: Peter Stuge <peter at stuge.se>
Modified:
trunk/src/mainboard/asus/m2v/romstage.c
Modified: trunk/src/mainboard/asus/m2v/romstage.c
==============================================================================
--- trunk/src/mainboard/asus/m2v/romstage.c Fri Nov 12 10:46:30 2010 (r6065)
+++ trunk/src/mainboard/asus/m2v/romstage.c Fri Nov 12 21:46:02 2010 (r6066)
@@ -194,6 +194,19 @@
giv++;
}
it8712f_exit_conf();
+
+ printk(BIOS_INFO, "it8712f gpio: Setting DDR2 voltage to 1.80V\n");
+ /*
+ * upper two bits of gpio_base+4 control ddr2 voltage:
+ * 11: 1.80V
+ * 01: 1.85V
+ * 10: 1.90V
+ * 00: 1.95V
+ *
+ * The lower six bits are inputs and normally read back as 1
+ * (except bit 2, which seems rather random).
+ */
+ outb(0xff, IT8712F_GPIO_BASE+4);
}
static void m2v_bus_init(void)
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