Attention is currently required from: Marx Wang, Paul Menzel.

Marx Wang uploaded patch set #4 to this change.

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soc/intel/apollolake: Provide the option to enable 2x refresh rate
to mitigate Row Hammer vulnerability

We need to enable 2x refresh rate in order to mitigate Row Hammer
vulnerability for the boards with specific DRAMs.To enable it, we
can select "ENABLE_DDR_2X_REFRESH" option.

BUG=N/A
TEST=select "ENABLE_DDR_2X_REFRESH", build the image and run
suspend_stress_test with memory check for 2500 cycles.

Change-Id: I0235fc7906626f28f14367c283433e5b066cc89a
---
M src/soc/intel/apollolake/Kconfig
M src/soc/intel/apollolake/meminit.c
2 files changed, 7 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/10/48510/4

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