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 2: Verified+1
Build Successful
https://qa.coreboot.org/job/coreboot-checkpatch/19358/ : SUCCESS
https://qa.coreboot.org/job/coreboot-gerrit/64570/ : SUCCESS
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David Schneider has posted comments on this change. ( https://review.coreboot.org/22890 )
Change subject: google/gru: Prettify strapping ID ADC table
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Patch Set 1: Code-Review+1
it's so pretty...
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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 2: Code-Review+1
> Patch Set 1:
>
> (1 comment)
>
> > Every other bucket is ~60 wide, with 30 on each side...except for bucket 1, which has 30 on the high side and 40 on the low side.
>
> Yeah, but I still don't see the value in changing that. The buckets are skewed but that's the way they were designed. If I put a number in there that's not the arithmetic mean between the target points it's just going to confuse someone later. It's about documentation too... if I didn't split it up I'd still have to put a comment explaining that Kevin is special which takes up about the same amount of space. This is the easiest way to just represent that right in the code.
Okay, this way is fine, then.
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Hello Lin Huang, David Schneider, Philip Chen, build bot (Jenkins),
I'd like you to reexamine a change. Please visit
https://review.coreboot.org/22891
to look at the new patch set (#2).
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/91/22891/2
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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:
(1 comment)
> Every other bucket is ~60 wide, with 30 on each side...except for bucket 1, which has 30 on the high side and 40 on the low side.
Yeah, but I still don't see the value in changing that. The buckets are skewed but that's the way they were designed. If I put a number in there that's not the arithmetic mean between the target points it's just going to confuse someone later. It's about documentation too... if I didn't split it up I'd still have to put a comment explaining that Kevin is special which takes up about the same amount of space. This is the easiest way to just represent that right in the code.
https://review.coreboot.org/#/c/22891/1/src/mainboard/google/gru/boardid.c
File src/mainboard/google/gru/boardid.c:
https://review.coreboot.org/#/c/22891/1/src/mainboard/google/gru/boardid.c@…
PS1, Line 26: 81
> math looks right, but comment is wrong
Thanks, fixed.
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Gerrit-Comment-Date: Fri, 15 Dec 2017 03:43:42 +0000
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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:
(1 comment)
> 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?
Every other bucket is ~60 wide, with 30 on each side...except for bucket 1, which has 30 on the high side and 40 on the low side.
So using the new value for everything makes the buckets more consistent.
(And before you say that it makes bucket 0 relatively large, note that since we don't have 0.000V as a distinct bucket, bucket 0 is actually 1.5 buckets. Such a theoretical -1 bucket, if we had it, would result in an additional threshold of 31.)
https://review.coreboot.org/#/c/22891/1/src/mainboard/google/gru/boardid.c
File src/mainboard/google/gru/boardid.c:
https://review.coreboot.org/#/c/22891/1/src/mainboard/google/gru/boardid.c@…
PS1, Line 26: 81
math looks right, but comment is wrong
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