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google/oak: increase the driving strength for 4GB DRAMs

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Some PVT units encountered DRAM calibration failure during power on/off
tests. The failure is caused by higher impedance of the DRAM on those units.
So increase the driving strength for 4GB DRAMs.

BUG=chrome-os-partner:57392
TEST=run cold reboot 100 times on PVT units which have DRAM calibration issue.

Change-Id: I0d1776cd1a5892d1f82e9bf414620d1ef6d29132
Signed-off-by: PH Hsu <ph.hsu@mediatek.com>
Reviewed-on: https://chromium-review.googlesource.com/394451
Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Reviewed-by: Pin-Huan Hsu <ph.hsu@mediatek.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
This commit is contained in:
PH Hsu 2016-10-06 12:31:52 +08:00 • committed by chrome-bot
parent de3cdef128
commit cf1aa5ade8
3 changed files with 6 additions and 6 deletions
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4
src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EB-4GB.inc
View file

@ -1,7 +1,7 @@
{ /* 4GB (16Gb + 16Gb) for dual rank dram setting */
{
.impedance_drvp = 0x9,
.impedance_drvn = 0xa,
.impedance_drvp = 0xc,
.impedance_drvn = 0xd,
.datlat_ucfirst = 19,
.ca_train = {

4
src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EE-4GB.inc
View file

@ -1,7 +1,7 @@
{ /* 4GB (16Gb + 16Gb) for dual rank dram setting */
{
.impedance_drvp = 0x9,
.impedance_drvn = 0xa,
.impedance_drvp = 0xc,
.impedance_drvn = 0xd,
.datlat_ucfirst = 18,
.ca_train = {

4
src/mainboard/google/oak/sdram_inf/sdram-lpddr3-hynix-4GB.inc
View file

@ -1,7 +1,7 @@
{ /* 2GB (8Gb + 8Gb) for single rank dram setting */
{
.impedance_drvp = 0x9,
.impedance_drvn = 0xa,
.impedance_drvp = 0xc,
.impedance_drvn = 0xd,
.datlat_ucfirst = 19,
.ca_train = {