Artesyn ATCA-9405 Installation and Use (May 2014) - Manual (Page 63)

Packet Processor
ATCA-9405 Installation and Use (6806800M71G) 63
3.4.4 Thermal Sensor
Majority of DDR3 Registered DIMMs contain a Thermal Sensor on DIMM (TSOD) and its output
is tied to EVENT# pin187 on the DIMM. This signal is an active low signal and is used by the
DIMM to notify the Processor or system management device that its thermal sensor has
crossed a thermal threshold. The four thermal sensors are readable by CN6880 and by the
IPMC. The EVENT# interrupts are connected to CN6880 (which is responsible for interrupt
routing) GPIO pins.
3.5 Octeon U-Boot
The two Octeon-II packet processors on the ATCA-9405 do not have a boot flash device. They
are started using the oct-remote-boot command from the Octeon SDK via the PCI bus
from the Freescale P2020 service processor.
Both Packet Processor Units are not powered when payload power is enabled by the IPMC. The
Packet Processor Units remain in power-off state until enabled by the Service Processor.
The CN6880 processors are hardware strapped for PCI Express (PCIe) Remote Boot Mode. After
power up or reset the processor cores remain in idle state until they are booted via PCIe
interface by the Service Processor.
3.5.1 NVRAM
U-Boot for the Octeon processors does not use an EEPROM to store its environment
parameters. Instead, the configuration parameters for U-Boot are transferred together with
the boot image from the service processor.
Organization 18*128Mx8 (1Gb die) 18*256Mx8 (2Gb die) 18*512Mx8 (4Gb die)
Number of Ranks 2 2 2
Package 240-pin VLP Registered DIMM with ECC
Oracle Number 9706802A83 9706802A73 9706802A20
Table 3-3 CN6880 Preferred Memory Modules (continued)
Characteristics 2 GB DIMM 4 GB DIMM 8 GB DIMM