romstage.c: force CLK3 to be always on #11
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
miczyg1
pushed a commit
that referenced
this pull request
May 28, 2019
This patch adds a workaround for Samsung C-die 2G/4G memory chips.
For unknown reasons, some boards with Samsung LP3 memory chips
could not pass early CS/CMD training. MRC has to change the
granularity from 16 ticks to 8 ticks, which implies bad margin
with this memory chip. Another way is to enhance the drive
strength for CS. This patch is to enhance the drive strength for CS
and CMD. Enhancing the drive strength for CMD could gain margin abaout
3 more ticks. Root cause needs to be further investigated with memory
vendor.
BUG=b:131177542
BRANCH=None
TEST=USE=fw_debug emerge-atlas chromeos-mrc coreboot chromeos-bootimage
& check the MRC log to ensure correct Rcomp values are passed to
MRC. Tested with board ID #8 and #11.
Change-Id: I9ea3ceda8dc8bf781063d3c16c7c2d9b44e5ddd6
Signed-off-by: Gaggery Tsai <[email protected]>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32695
Tested-by: build bot (Jenkins) <[email protected]>
Reviewed-by: Caveh Jalali <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
No description provided.