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 <[email protected]> --- Index: src/mainboard/asus/m2v/romstage.c =================================================================== --- src/mainboard/asus/m2v/romstage.c.orig 2010-11-12 21:35:25.000000000 +0100 +++ src/mainboard/asus/m2v/romstage.c 2010-11-12 21:35:42.000000000 +0100 @@ -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) -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
