Attention is currently required from: Felix Singer, Michał Żygowski, Tim Wawrzynczak, Michał Kopeć.
Hello Felix Singer, build bot (Jenkins), Michał Żygowski, Tim Wawrzynczak, Michał Kopeć, Angel Pons,
I'd like you to reexamine a change. Please visit
https://review.coreboot.org/c/coreboot/+/68794
to look at the new patch set (#7).
Change subject: mb/clevo/l140mu: work around PECI staying high when idle, blocking s0ix ......................................................................
mb/clevo/l140mu: work around PECI staying high when idle, blocking s0ix
According to Intel doc# 575683 the PECI bus should be low when idle and is pulled up by clients with strong drive. However, for unknown reasons the bus stays high on this board, blocking s0ix entry.
The PECI reference schematic in the ASPEED AST2400 BMC datasheet (actually not related to this board) says that a pull-down is *required* for the idle state.
This might be just a requirement of this BMC, since this is nowhere documented in Intel datasheets, schematics or elsewhere. However, configuring a weak pull-down (20 k) on the PECI pad indeed solves this problem for now.
Change-Id: I85193000af67cd2c0465bdbb58cdd51b68fd5b4f Signed-off-by: Michael Niewöhner foss@mniewoehner.de --- M src/mainboard/clevo/tgl-u/variants/l140mu/gpio.c 1 file changed, 27 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/94/68794/7