diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2013-10-16 09:21:55 -0700 |
|---|---|---|
| committer | Aaron Durbin <adurbin@google.com> | 2014-02-16 20:37:55 +0100 |
| commit | 6c52ba77797c2ac62dcdb74e1bdd898003b9bc3b (patch) | |
| tree | ba99becdfa3dcf02b8455591c1dd5ab842cec8d2 /src/cpu/allwinner/a10/bootblock.c | |
| parent | f3f409bf5592dc093dc7f2dc1448ad21879c466e (diff) | |
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@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/173211
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-on: http://review.coreboot.org/4885
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src/cpu/allwinner/a10/bootblock.c')
0 files changed, 0 insertions, 0 deletions