Artesyn Embedded Technology ATCA-7540, Installation And Use Manual, Page: 313 / 324

IPMI Feature Set
ATCA-7540 Installation and Use (6806871A01A) 313
9.11 Asynchronous Event Notification
The FRU Activate (Deactivate) and FRU Control (Graceful Reboot) command messages are
routed as a LUN2 message to payload interface for graceful shutdown/reboot requests.
The provided payload application includes these commands via OpenIPMI library to take all
necessary actions before the payload is gracefully rebooted/shutdown.
Graceful Reboot and Graceful Shutdown is also communicated to the Intel CPU via internal
communication channel.
9.12 Serial Line Selection
The ATCA-7540 blade provides two serial interfaces from payload. By default, the first is routed
to the front connector and the second to the RTM. In addition, there is an IPMC debug
interface, which can be routed either to the front or to the RTM (this function is available if the
RTM provides a serial connector at the front).
The IPMC provides an OEM command called Set/Get Serial Output to be used to influence this
serial interface routing default. The serial line selection is implemented non-persistently to
ensure that the serial interfaces can be accessed easily after power-up.
9.13 BIOS Boot Bank Selection
The ATCA-7540 provides redundant payload boot flashes for manual and automatic crisis
recovery. The general concept is that there is always an active and a standby SPI flash device.
The role of the two devices can be reversed by the FPGA. For this to work, the FPGA has to drive
the chip select signals to the SPI flashes. The final decision on which of the two devices is active
and standby is done by the IPMC.
The BIOS Boot Bank Selection is implemented such that swapping the SPI flashes is not in effect
immediately. To ensure that the active BIOS bank cannot be overwritten, the boot bank
selection is masked with a payload reset. Swapping the boot bank is possible with the following
steps:

Swap the BIOS boot banks

Reset the payload