Change in coreboot[master]: [WIP]soc/intel/common/block: Add EMMC dll caching infrastructure

[Bora Guvendik (Code Review)]

Bora Guvendik has uploaded a new patch set (#9) to the change originally created by Thejaswani Putta. ( https://review.coreboot.org/c/coreboot/+/38256 )

Change subject: [WIP]soc/intel/common/block: Add EMMC dll caching infrastructure
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[WIP]soc/intel/common/block: Add EMMC dll caching infrastructure

Provide support needed to save EMMC dll tuned data to SPI and registers
boot after flash and in subsequent boots, read emmc data from SPI flash
and copy to the registers. Incase tuning fails, setting a flag in header
to skip tuning next boot and use FSP default values.

TEST: Tested if data is written to SPI EMMC_CACHE and if the readback data
is valid. Also verified if the flag is setting right when tuning fails.

Change-Id: I0ca1452cbdcbadd3fca644dcc2dfb7b721e02fb7
Signed-off-by: Thejaswani Putta 
---
M src/mainboard/google/drallion/chromeos.fmd
M src/soc/intel/common/block/scs/Kconfig
M src/soc/intel/common/block/scs/Makefile.inc
A src/soc/intel/common/block/scs/emmc_cache.c
4 files changed, 504 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/38256/9