chassis

Description

A chassis within the system.

Chassis are typically a physical enclosure that contains system components such as CPUs, fans, power supplies, and PCIe cards. A chassis can be stand-alone, such as a tower or desktop. A chassis can also be designed to be mounted in an equipment rack.

A chassis only needs to be defined in the config file if it contains a power sequencer device.

Chassis Templates

In a multiple chassis system, two or more of the chassis may have the same hardware design.

A chassis template can be used to avoid duplicate data.

Specify the "template_id" and "template_variable_values" properties to use a chassis template.

Properties

Name	Required	Type	Description
comments	no	array of strings	One or more comment lines describing this chassis.
number	see notes	number	Chassis number within the system. Chassis numbers start at 1 because chassis 0 represents the entire system.
inventory_path	see notes	string	D-Bus inventory path of the chassis, such as "/xyz/openbmc_project/inventory/system/chassis".
power_sequencers	see notes	array of power_sequencers	One or more power sequencer devices within the chassis.
template_id	see notes	string	Unique ID of the chassis template to use for the contents of this chassis.
template_variable_values	see notes	template_variable_values	Chassis-specific values for chassis template variables.

Notes

• You must specify exactly one of the following two groups of properties:
  • "number", "inventory_path", and "power_sequencers"
  • "template_id" and "template_variable_values"

Examples

{
  "number": 1,
  "inventory_path": "/xyz/openbmc_project/inventory/system/chassis",
  "power_sequencers": [
    {
      "type": "UCD90320",
      "i2c_interface": { "bus": 3, "address": "0x11" },
      "power_control_gpio_name": "power-chassis-control",
      "power_good_gpio_name": "power-chassis-good",
      "rails": [
        {
          "name": "VDD_CPU0",
          "page": 11,
          "check_status_vout": true
        },
        {
          "name": "VCS_CPU1",
          "presence": "/xyz/openbmc_project/inventory/system/chassis/motherboard/cpu1",
          "gpio": { "line": 60 }
        }
      ]
    }
  ]
}

{
  "comments": ["Chassis 2: Standard hardware layout"],
  "template_id": "standard_chassis_template",
  "template_variable_values": {
    "chassis_number": "2",
    "sequencer_bus_number": "13"
  }
}