Artesyn ATCA-7470 Installation and Use (October 2014) - Manual (Page 132)

Functional Description
ATCA-7470 Installation and Use (6806800P15K) 132
The IPMC supports the initiation of a graceful shutdown of the host CPU. The IPMC can force
the CPU to reset. It also controls the power and reset of the payload. As part of the power
control logic circuitry is provided that controls the correct power-up and power-down
sequencing of all payload specific power domains to prevent latch-up and damage of devices.
The IPMC provides a watchdog that supervises the payload. If enabled, the payload software
needs to re-trigger the Watchdog to prevent a time-out. A watchdog time-out can generate an
NMI, a payload reset, or disabling/cycling of the payload power. The watchdog settings,
including enable/disable, can be changed by payload software (setup menu). Time-out values
can be selected from as short as seconds to as long as minutes. The IPMC is supervised by a
separate hardware Watchdog, which cannot be disabled. IPMC FW re-triggers the Watchdog
timer. The IPMC monitors the Port 80 POST codes generated by the payload CPU. The IPMC is
connected to various sensors on the Blade that provide temperature sensor readings at all
major devices and voltage sensor readings of all major voltages. The IPMC monitors reset
events caused by devices like Watchdog, IPMI command, and reset button. The FRU
information of the various modules including front board, RTM, and other modules can be read
via the IPMC and if necessary upgraded thru the IPMC. The IPMC features Serial over LAN (SOL)
for the payload CPU serial console. The SOL interface is available via the ATCA Base I/F. SOL is
activated by specific IPMI commands.
5.11 Serial Redirection
The CPU serial redirection reroutes the console input and output; that is the text output to the
text screen and input from the standard keyboard. The console typically is used by the BIOS
setup menus, BIOS initialization and boot routines, OS boot loaders, and loaded OSs.
The serial console of the payload CPU is available via SOL. In addition to the SOL capability the
serial console is also available on the blade face plate using an RJ45 connector with Cisco pin-
out.
If an SOL session is established, only the output is available on the face plate. Input is not
possible during this time via the face plate. Alternatively to the CPU serial console, the IPMC
serial console is also available on the face plate serial connector. It can be selected via specific
IPMI OEM command.