7 sema (smart embedded management agent), Sema (smart embedded management agent) – ADLINK ETX-BT User Manual
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7 SEMA (Smart Embedded Management Agent)
The onboard microcontroller (BMC) implements power sequencing and Smart Embedded
Management Agent (SEMA) functionality.
The microcontroller communicates via the System Management Bus with the CPU/chipset. The
following functions are implemented.
X
Total operating hours counter. Counts the number of hours the module has been run in
minutes.
X
On-time minutes counter. Counts the seconds since last system start.
X
Temperature monitoring of CPU and board temperature. Minimum and maximum
temperature values of CPU and board are stored in flash.
X
Power cycles counter
X
Boot counter. Counts the number of boot attempts.
X
Watchdog Timer (Type-II). Set, Reset, Disable Watchdog Timer. Features auto-reload at
power-up.
X
System Restart Cause. Power loss, BIOS Fail, Watchdog, Internal Reset, External Reset
X
Fail-safe BIOS support. In case of a boot failure, hardware signals tell external logic to boot
from fail-safe BIOS.
X
Flash area. 1kB Flash area for customer data
X
128 Bytes Protected Flash area. Keys, IDs, etc. can be stored in a write- and clear-
protectable region.
X
Board Identifiers. Vendor, Board, Serial number, Production Date
X
Main-current & voltage. Monitors drawn current and main voltages
For a detailed description of SEMA features and functionality, please refer to the SEMA
Technical Manual and SEMA Software Manual, downloadable at:
Note: Due to limitations of the Intel “Bay Trail” platform, SEMA can only obtain CPU temperature
readings when the OS is running.