Hello Marx Wang, build bot (Jenkins), Furquan Shaikh,
I'd like you to reexamine a change. Please visit
https://review.coreboot.org/28439
to look at the new patch set (#2).
Change subject: mb/google/poppy/variants/nautilus: Bump VCC_SA voltage offset 75mV ......................................................................
mb/google/poppy/variants/nautilus: Bump VCC_SA voltage offset 75mV
Nautilus-Wifi with m3 AP got a halt issue during CTS test.
Nautilus-Wifi was FCS with Celeron AP first and also its PCB/BOM was validated only with Celeron. Since Celeron deos not support turbo boost mode, its steady power demend and lower CPU frequency may not reflect the potential noise hidden inside the board.
Bumping VCC_SA voltage offset 75mV confirmed works to mitigate the potential noise coupling to VCC_GT/SA, and we verified this change makes this issue go away on Nautilus-Wifi board.
Nautilus-LTE doesn't show this issue, since it has 10L PCB, will have better grounding and less noise/ripple than 8L PCB.
BUG=b:111417632 BRANCH=poppy TEST=Verified CTS test pass without an issue.
Change-Id: Id13fcc36a5b6ed42620c66f57a7303f30bff1a50 Signed-off-by: Seunghwan Kim sh_.kim@samsung.com --- M src/mainboard/google/poppy/romstage.c M src/mainboard/google/poppy/variants/baseboard/include/baseboard/variants.h M src/mainboard/google/poppy/variants/nautilus/Makefile.inc M src/mainboard/google/poppy/variants/nautilus/mainboard.c M src/mainboard/google/poppy/variants/nautilus/memory.c A src/mainboard/google/poppy/variants/nautilus/sku.c 6 files changed, 78 insertions(+), 21 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/39/28439/2