[coreboot-gerrit] Change in coreboot[master]: soc/intel/apollolake: Provide the option to enable DDR 2x refresh rate

[Marx Wang (Code Review)]

Attention is currently required from: Paul Menzel, Angel Pons.
Hello Gaggery Tsai, build bot (Jenkins), Andrey Petrov, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/48510

to look at the new patch set (#10).

Change subject: soc/intel/apollolake: Provide the option to enable DDR 2x refresh rate
......................................................................

soc/intel/apollolake: Provide the option to enable DDR 2x refresh rate

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_GLK_DDR_2X_REFRESH" option.

BUG=N/A
TEST=select "ENABLE_GLK_DDR_2X_REFRESH", build the image and run
suspend_stress_test with memory check for 2500 cycles.

Signed-off-by: Marx Wang 
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/10/48510/10