|
When PCH works under eSPI mode, the PMC (Power Management Controller) in
PCH is waiting for SUS_ACK from BMC after it alerts SUS_WARN. It is in
dead loop if no SUS_ACK assert. This is the basic requirement for the BMC
works as eSPI slave.
Also for the host power on / off actions, from BMC side, the following VW
(Virtual Wire) messages are done in firmware:
1. SLAVE_BOOT_LOAD_DONE / SLAVE_BOOT_LOAD_STATUS
2. SUS_ACK
3. OOB_RESET_ACK
4. HOST_RESET_ACK
Also, it provides monitoring interface of PLTRST_N signal through
/dev/espi-pltrstn
Signed-off-by: Haiyue Wang <haiyue.wang@linux.intel.com>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
Signed-off-by: James Feist <james.feist@linux.intel.com>
Signed-off-by: Vernon Mauery <vernon.mauery@intel.com>
|
