Advantech MIC-5602, User Manual

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MIC-5602 User Manual 40
5.1 Module Management Controller (MMC)
As mentioned in Section 2.2.8, the MMC is an intelligent controller that manages the
AMC (e.g. health monitoring, hot swap, LEDs, etc.). It provides a communication
interface to a carrier in an ATCA or µTCA system over an IPMB bus (IPMB-L). Fur-
thermore, a connection to the x86-system is implemented by a serial interface to the
3100 chipset.
The MIC-5602 MMC is based on an Atmel AVR microcontroller. The Atmega128L is
equipped with 128 KB internal Flash, 4 KB SRAM and 4 KB EEPROM. The flash
holds a boot-loader and two firmware images and the FRU data is stored in the inter-
nal EEPROM.
The hardware I2C of the AVR is used as IPMB-L bus interface and one of the
ATmega128 UARTs as serial payload interface to the chipset. Additionally there are
several signals connected between MMC and CPU / chipset for payload monitoring
and control (payload reset, sleep signals, E-Keying, etc.).
Voltage and temperature monitoring is done with the AVR ADC input pins and two
external temperature sensors. Please refer to section 2.2.8 for detail.
5.1.1 BIOS Image Selection by MMC
Booting from the BIOS recovery image can be forced with a jumper setting (verify
chapter 2.2.19). Additionally it is possible to force the recovery image over the IPMB-
L bus or payload interface with the MMC. This is accomplished by a parameter stored
in the FRU data. If the parameter (byte) is set to 0x01, the MMC will force execution
of the recovery image within the next boot sequence. If the byte is zero (default), the
BIOS user image is executed. To read and write this parameter, Advantech OEM
IPMI commands are used.
5.1.1.1 Read BIOS Image configuration
The "Read Configuration Settings" Advantech OEM IPMI command can be used to
read out the BIOS image selection setting.
Table 5.1: Command Assignment
IPMI net function 0x2E / 0x2F (OEM)
Advantech IPMI OEM command 0x41
Table 5.2: Request Data
Byte Data field
1:3 Advantech IANA ID: 0x39 28 00
4 Logical device number: 0x03
5 Port byte: 0x00
Table 5.3: Response Data
Byte Data field
1 Completion Code
2:4 Advantech IANA ID: 0x39 28 00
5 Current setting: 0x00 = BIOS user image
0x01 = BIOS recovery image