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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: 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>
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3 changed files with 6 additions and 6 deletions
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@ -1,7 +1,7 @@
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{ /* 4GB (16Gb + 16Gb) for dual rank dram setting */
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{
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.impedance_drvp = 0x9,
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.impedance_drvn = 0xa,
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.impedance_drvp = 0xc,
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.impedance_drvn = 0xd,
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.datlat_ucfirst = 19,
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.ca_train = {
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@ -1,7 +1,7 @@
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{ /* 4GB (16Gb + 16Gb) for dual rank dram setting */
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{
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.impedance_drvp = 0x9,
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.impedance_drvn = 0xa,
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.impedance_drvp = 0xc,
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.impedance_drvn = 0xd,
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.datlat_ucfirst = 18,
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.ca_train = {
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@ -1,7 +1,7 @@
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{ /* 2GB (8Gb + 8Gb) for single rank dram setting */
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{
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.impedance_drvp = 0x9,
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.impedance_drvn = 0xa,
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.impedance_drvp = 0xc,
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.impedance_drvn = 0xd,
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.datlat_ucfirst = 19,
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.ca_train = {
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