build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/22891 )
Change subject: google/gru: Adjust to incorrect strapping resistors on Kevin
......................................................................
Patch Set 1: Verified+1
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Julius Werner has posted comments on this change. ( https://review.coreboot.org/22891 )
Change subject: google/gru: Adjust to incorrect strapping resistors on Kevin
......................................................................
Patch Set 1:
> Why not apply this change to all boards? The code 1 bucket is oversized at the moment.
Because... that's... less correct? I mean, my Scarlet actually reads 42. And it doesn't matter anyway (until it does), but it seems like we should apply the tolerance we have equally on all sides, right?
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Julius Werner has posted comments on this change. ( https://review.coreboot.org/22891 )
Change subject: google/gru: Adjust to incorrect strapping resistors on Kevin
......................................................................
Patch Set 1:
As usual I made all the numbers up and am relying on David to check the math.
Since this doesn't actually seem to be the answer to b/70692504 I'll probably not going to rush this in before I'm gone next week, but I thought I might as well put it up anyway.
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David Schneider has posted comments on this change. ( https://review.coreboot.org/22891 )
Change subject: google/gru: Adjust to incorrect strapping resistors on Kevin
......................................................................
Patch Set 1:
Why not apply this change to all boards? The code 1 bucket is oversized at the moment.
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Hello Lin Huang, David Schneider, Philip Chen,
I'd like you to do a code review. Please visit
https://review.coreboot.org/22891
to review the following change.
Change subject: google/gru: Adjust to incorrect strapping resistors on Kevin
......................................................................
google/gru: Adjust to incorrect strapping resistors on Kevin
It seems that RAM code 0 has been strapped with an incorrect resistor on
Kevin. The resulting voltage divide still puts it well within the ADC
value bucket reserved for that slot, but a little closer to the edge
than necessary. While this doesn't seem to cause any immediate problems
on its own, it still doesn't hurt to fix it (if only for the
documentation value).
On other boards (at least on my Scarlet) the strapping seems to be
correct.
Change-Id: Ic5199834fbeaf734e725ff45b04f45eefe149855
Signed-off-by: Julius Werner <jwerner(a)chromium.org>
---
M src/mainboard/google/gru/boardid.c
1 file changed, 4 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/91/22891/1
diff --git a/src/mainboard/google/gru/boardid.c b/src/mainboard/google/gru/boardid.c
index 6d18648..22730a2 100644
--- a/src/mainboard/google/gru/boardid.c
+++ b/src/mainboard/google/gru/boardid.c
@@ -22,7 +22,11 @@
static const int id_readings[] = {
/* ID : Volts : ADC value : Bucket */
/* == ===== ========= ========== */
+#if IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)
+/* 0 : 0.109V: 62 : 0 - 81 */ 91,
+#else
/* 0 : 0.074V: 42 : 0 - 81 */ 81,
+#endif
/* 1 : 0.211V: 120 : 82 - 150 */ 150,
/* 2 : 0.319V: 181 : 151 - 211 */ 211,
/* 3 : 0.427V: 242 : 212 - 274 */ 274,
--
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