2. IPU-M2000 BMC specification

The IPU-M2000 baseboard management controller (BMC) runs software based on the OpenBMC project.

The responsibilities of the BMC software stack are to control, monitor and manage system hardware, including power, sensors, inventories and event logging.

You can control and monitor the system, via the BMC, using a variety of user interfaces such as a command line interface (CLI), graphical user interface (GUI), REST API, IPMI and Redfish.

2.1. BMC subsystem

A block diagram of the IPU-M2000, showing the BMC subsystem, is shown in Fig. 2.1.

The physical components in the BMC subsystem are:

• ASPEED AST2520 baseboard management controller

• System FPGA

• 128 MB serial boot flash

• 1 GB of DDR4 DRAM

• One USB port — Micro-USB management interface, see Fig. 13.1

• Two 1 GbE ports — at boot the BMC Ethernet interface (eth0) is set to 100 Mbps, full-duplex, auto-negotiation on

• Two I²C PSU interfaces for monitoring the state of the power supplies

• Five fan interfaces for controlling and measuring the speed of the system cooling fans

• Three LEDs used to indicate status

2.1.1. System FPGA

The FPGA is mainly a status and control signal concentrator. It ensures that those control signals are always in a safe state. In addition, it provides hardware monitoring and protection for any thermal or voltage abnormalities. It also controls the sequencing of supply voltages, clocks and reset signals.

2.1.2. LEDs

There are three LEDs used to indicate status:

• Green indicates normal operation status

• White is used to identify a specific IPU-M2000 in a system

• Yellow indicates various error conditions:

  • Temperature alert detected

  • Standby voltages detected failing

  • PSUs detected failing

  • Connector domain detected failing

  • GW 1 domain detected failing

  • IPU 1 and 2 or IPU 3 and 4 domains detected failing

  • Fan fail detected (too few fans or fans running too slow)

  • No profile configuration found in flash

  • BMC flash not trusted

2.2. BMC functions

The BMC supports the following system management functions:

• Events and logging

• Firmware operations

• Inventory monitoring

• Maintenance mode and BIST

• Network configuration

• Power operations

• Sensor monitoring

• Time settings

• User management

2.3. IPU-M2000 block diagram

Fig. 2.1 IPU-M2000 BMC block diagram

2.4. Supported IPMI commands

2.5. Supported ipmitool commands

This section summarises the ipmitool commands supported by the BMC. For details of the parameters and examples of use, see the appropriate user guide chapter.

The BMC is tested with ipmitool version 1.8.18.

Table 2.1 Inventory monitoring

Command	Description
fru print	Display information about all FRUs
fru print <fruid>	Display information about the FRU with the specified ID

Table 2.2 Events and logging

Command	Description
sel clear	Clear all event logs
sel list	Display list of events
sel elist	Display list of events with extended information

Table 2.3 Network configuration

Command	Description
lan print	Print network information
ipsrc dhcp	Enable DHCP
ipsrc static	Configure static IP
ipaddr <ip_address>	Set IP address
netmask <x.x.x.x>	Set IP address
defgw ipaddr <ip_address>	Set default gateway IP address

Table 2.4 Power operations

Command	Description
power off	Hard power off
power soft	Soft power off
power reset	Warm reboot
power on	Power on
bmc reset cold	BMC reboot
dcmi power get_limit	Get current status of power cap
dcmi power set_limit limit <limit>	Set new power cap value
dcmi power activate	Enable power capping
dcmi power deactivate	Disable power capping

Table 2.5 Sensor monitoring

Command	Description
sdr list	Display sensor data repository (SDR) entry readings and their status
sdr elist	Display extended sensor information
sensor list	Display sensors and thresholds in a wide table format
sdr get <sensor_name>	Display information for sensor data records specified by sensor ID
sdr type	Display a list of sensor types
sdr type <sensor_type>	Display all records from the SDR repository of a specific type

Table 2.6 Serial over LAN (SoL)

Command	Description
sol activate	Access serial over LAN (SoL) interface

Table 2.7 Time settings

Command	Description
sel time set “DD/MM/YYYY HH:MM:SS”	Set time and date (will fail if system is in NTP mode)
sel time get	Get time and date

Table 2.8 User management

Command	Description
user summary [<channel_number>]	Print a summary, including number of users on the system
user list [<channel_number>]	List users
user set name <user_id> <username>	Create a user with <user_id> and <username>
user set password <user_id> [<password> <16|20>]	Create a password for user with <user_id> (the password can be 16 or 20 bytes in length)
user enable <user_id>	Enable user with <user_id> (must be done after creating user and password)
user disable <user_id>	Disable user with <user_id>
user priv <user_id> <privilege_level> [<channel_number>]	Set privilege level for user with <user_id>
channel setaccess <channel> <user_id> ipmi=on	Enable IPMI access for a user

• The maximum number of system users is 30

• The maximum number of users with IPMI access is 15

• The maximum username length for an IPMI user is 16 bytes

• User IDs are from 1 to 15

• Passwords must be a minimum of 8 characters in length

• The privilege levels are:

  • 0x1: Callback

  • 0x2: User

  • 0x3: Operator

  • 0x4: Administrator

  • 0x5: OEM Proprietary

  • 0xF: No Access