Time Sync; Sel; Sdr - QUANTA QSSC-S99K 2U User Manual

Multi-node system

Chapter 4 — BMC

Time Sync

In S99K 2U BMC design, BMC do not have a local RTC to know what time it is. Each time when server power on, BIOS

will use Set SEL Time command to initial BMC time. While time smaller than 0x20000000, BMC will default initial it's

SEL time to 0xFFFFFFFF. Remote console program shall interpret this time as pre-initial.

BMC supports IPMI 1.5/2.0 standard SEL operation. It can keep to maximum 909 entries SEL log. Event happened in

BIOS side will be logged by using Add SEL Entry command. BMC will store them in NV, the time stamp field will be

filled by BMC. When SEL full, the new SEL won't be logged but will go through PEF still. If AC power off, all SEL will

remain in NV.

SEL Coherency Issue Between BIOS and BMC

Sensor Type

Critical Interrupt

Memory

POST Error

QPI Error

PCIE Error

Internal Error

In the implementation architecture, as long as BIOS detects an event, it should use Add SEL Entry command send this event

to BMC, and BMC will keep this event log in local SEL. So remote console can directly query event log from BMC.

There's no need for BIOS to keep another SEL and is also forbidden for doing this. For the event message supported in this

platform please refer section System Event Log Format.

BMC supports IPMI 1.5/2.0 standard SDR operation, refer to SDR Repository Commands for more information. All SDR

records saved into Flash memory. Size of SDR repository is 4KB. For the format of SDR, please refer to section Sensor and

SDR for more information about the SDR detail implementation.

Event Offset

4h. PCI PERR

5h. PCI SERR

0h. Correctable error

1h. Uncorrectable error

Owner for generating

Meaning

this event

BIOS