diff options
| author | PH Hsu <ph.hsu@mediatek.com> | 2016-10-06 12:31:52 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2016-10-08 16:41:03 +0200 |
| commit | 34a6537512d412363bf56428b7ae284e6dd80fb3 (patch) | |
| tree | d3f07d1f21ddfc5844fb6a3f55b253e33539a411 | |
| parent | 5b1bb3d980475a4af5b2feed078ec64437da2175 (diff) | |
| download | coreboot-34a6537512d412363bf56428b7ae284e6dd80fb3.tar.xz | |
google/oak: Increase the driving strength for 4GB DRAMs
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: I8a329093db3f1def566e4b7afec3c4f4bfe44c6a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: cf1aa5ade856af433fa056f51a20d18553ae241d
Original-Change-Id: I0d1776cd1a5892d1f82e9bf414620d1ef6d29132
Original-Signed-off-by: PH Hsu <ph.hsu@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/394451
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Pin-Huan Hsu <ph.hsu@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/16917
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
3 files changed, 6 insertions, 6 deletions
diff --git a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EB-4GB.inc b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EB-4GB.inc index 0fe16a6104..f03f858b82 100644 --- a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EB-4GB.inc +++ b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EB-4GB.inc @@ -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 = { diff --git a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EE-4GB.inc b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EE-4GB.inc index e6c3a831e6..a9fbcf17ee 100644 --- a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EE-4GB.inc +++ b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-K4E6E304EE-4GB.inc @@ -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 = { diff --git a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-hynix-4GB.inc b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-hynix-4GB.inc index 099a07c1dc..6e3b203fed 100644 --- a/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-hynix-4GB.inc +++ b/src/mainboard/google/oak/sdram_inf/sdram-lpddr3-hynix-4GB.inc @@ -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 = { |