diff options
| author | Tobias Diedrich <ranma+coreboot@tdiedrich.de> | 2010-11-12 20:46:02 +0000 |
|---|---|---|
| committer | Peter Stuge <peter@stuge.se> | 2010-11-12 20:46:02 +0000 |
| commit | 5960fb3dbd5c942d3c11f06dcd0c55f940444260 (patch) | |
| tree | 68a9a4d40e8740e25dab3f3d2ed4a04a06f75a3e /src/mainboard/asus | |
| parent | e85e0c7c54aa6a3b32918fc218d585df70b23eda (diff) | |
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
Diffstat (limited to 'src/mainboard/asus')
| -rw-r--r-- | src/mainboard/asus/m2v/romstage.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/mainboard/asus/m2v/romstage.c b/src/mainboard/asus/m2v/romstage.c index c807daf47a..4a9d5ccc12 100644 --- a/src/mainboard/asus/m2v/romstage.c +++ b/src/mainboard/asus/m2v/romstage.c @@ -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) |