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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@tdiedrich.de>
Acked-by: Peter Stuge <peter@stuge.se>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6066 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Tobias Diedrich 2010-11-12 20:46:02 +00:00 committed by Peter Stuge
parent e85e0c7c54
commit 5960fb3dbd
1 changed files with 13 additions and 0 deletions
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13
src/mainboard/asus/m2v/romstage.c
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@ -194,6 +194,19 @@ static void m2v_it8712f_gpio_init(void)
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)