Specifications

HSC Functional Specifications QSSC-S4R Technical Product Specification
314
31. HSC Functional Specifications
31.1 Platform Determination
The HSC provides a unique platform identifier through several management interfaces. The table below shows the
identifiers returned by the interfaces on the backplane. The I
2
C identification is returned as part of the IPMI Get Device
ID response. The SAFTE and SES responses are part of the inquiry data. The firmware BootInfo identifier is embedded
in the firmware image header.
Table 204. Platform Identification
Interface Identifier
I
2
C/IPMB 0A0Dh
I
2
C/SAF-TE SCA HSBP M12….
I
2
C/SES SCA HSBP M12….
Firmware BootInfo SCA HSBP M12
31.1.1 Auto Detection of Platform Type
The HSC firmware is shared by both server systems, but the HSC communication through the SGPIO differs. The HSC
firmware configures to the appropriate bus adapter type by detecting a unique data pattern on the SLoad line provided
by BIOS during the first 20 seconds of POST. The table shows the unique SGPIO data pattern for the ESB2
configuration. If the pattern is not seen during the first 20 seconds of POST, the HSC will assume default the SGPIO
mode.
Table 205. Bus Adapter Identification
Signal Value
SLOAD 0x0C
SDATA0_in 0xB6D
31.2 System Initialization
31.2.1 Non-Volatile Setting Initialization
Upon initialization, the HSC reads non-volatile settings from its I2C EEPROM. These settings include initial sensor
configuration values and FRU/sensor record integrity headers. If an I2C EEPROM cannot be found, then default values
are used.
31.2.2 Sensor Initialization
The HSC receives sensor initialization values from the baseboard management controller (BMC). The BMC sends IPMI
sensor initialization values to the HSC during IPMI initialization agent runtime.
31.2.3 Cable Detection
The HSC detects the presence of the SFF-8087 cables upon firmware initialization. The detection is done via active-
low GPIO signals routed from out-of-band signal ground pins. Each SFF-8087 connection corresponds to four disk
drive connections. Depending on the combination of presence signals, the HSC configures itself for four- or eight-disk
management as shown in Table 206. After self-configuration, the HSC only acknowledges either four or eight disks in
management responses. In a four disk configuration (cable A only) the HSC reports four disk slots in IPMI, SAFTE, and
SES responses. All LEDs remain accessible via IPMI and SGPIO, regardless of the number of cables detected.