[coreboot-gerrit] Change in coreboot[master]: soc/amd/picasso: Convert DDR4 MHz to MT/s correctly

[Rob Barnes (Code Review)]

Hello build bot (Jenkins), Raul Rangel, Jack Rosenthal, Paul Fagerburg,

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

https://review.coreboot.org/c/coreboot/+/45177

to look at the new patch set (#4).

Change subject: soc/amd/picasso: Convert DDR4 MHz to MT/s correctly
......................................................................

soc/amd/picasso: Convert DDR4 MHz to MT/s correctly

Memory speed is given as an integer in MHz. In some cases it has
an implicit fractional speed, so simply multiplying by 2 is not
sufficient.

Instead tCK(avg) values from the JEDEC DDR4 spec are used to
calculate accurate MHz ranges for each speed bin. The normalized
MT/s value for the speed bin is then used for SMBIOS type 17.

BUG=b:167155849
TEST=Boot ezkinil, check output of 'mosys memory spd print all'
     and dmidecode -t17

Signed-off-by: Rob Barnes 
Change-Id: Icc77c21932c68ee9f0ff0b8e35ae7b1a3732b322
---
M src/soc/amd/picasso/dmi.c
1 file changed, 144 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/77/45177/4