[coreboot-gerrit] Patch merged into coreboot/master: 3ac4460 rambi: disable internal pullups on ram_id[2:0]
gerrit at coreboot.org
gerrit at coreboot.org
Sun Feb 16 20:38:00 CET 2014
the following patch was just integrated into master:
commit 3ac446036988bca020d902bd9b5c580cd367d9bb
Author: Aaron Durbin <adurbin at chromium.org>
Date: Wed Oct 16 09:21:55 2013 -0700
rambi: disable internal pullups on ram_id[2:0]
The ram_id[2:0] signals have stuffing options for pull up/down
with values of 10K. However, the default pulldown values for these
pads are 20K. Therefore, one can't read a high value because of
the high voltage threshold is 0.65 * Vref. Therefore the high
signals are marginal at best.
Fix this issue by disabling the internal pull for the pads connected
to ram_id[2:0].
BUG=chrome-os-partner:23350
BRANCH=None
TEST=Built and checked that ram_id[2:0] is properly read now.
Change-Id: Ib414d5798b472574337d1b71b87a4cf92f40c762
Signed-off-by: Aaron Durbin <adurbin at chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/173211
Reviewed-by: Shawn Nematbakhsh <shawnn at chromium.org>
Reviewed-by: Bernie Thompson <bhthompson at chromium.org>
See http://review.coreboot.org/4885 for details.
-gerrit
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