Change in coreboot[master]: nb/amd/{agesa,pi}: Avoid overflows during DRAM calculation

[Michał Żygowski (Code Review)]

Attention is currently required from: Michał Żygowski.
Hello build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/52922

to look at the new patch set (#2).

Change subject: nb/amd/{agesa,pi}: Avoid overflows during DRAM calculation
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nb/amd/{agesa,pi}: Avoid overflows during DRAM calculation

Do not use get_dram_base_mask to calculate system DRAM limits. Shift
operation around values operating on base and mask were causing
overflows and thus incorrect system DRAM limit. Another function
returning base and limit in KiB has been developed to avoid data loss.

TEST=boot PC Engines apu1 2GB, apu2 4GB and apu3 2GB and boot Debian
with Linux 4.14

Signed-off-by: Michał Żygowski 
Change-Id: I3b5c1df96c308ff50c8de104e213219a98f25e10
---
M src/northbridge/amd/agesa/family14/northbridge.c
M src/northbridge/amd/agesa/family15tn/northbridge.c
M src/northbridge/amd/agesa/family16kb/northbridge.c
M src/northbridge/amd/pi/00730F01/northbridge.c
4 files changed, 136 insertions(+), 155 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/22/52922/2