Exposing sensors to IPMI over dbus

[James Feist]

On 12/19/19 1:12 AM, AKASH G J wrote:
> Hi all,
> I am using OpenBMC firmware for server board having Aspeed AST-2500.
> 
> Followed 
> https://github.com/openbmc/entity-manager/blob/master/docs/my_first_sensors.md 
> for populating sensor value to dbus. Entity manager configuration file 
> is given below.
> {
>      "Exposes": [
>          {
>              "Address": "0x4f",
>              "Bus": 5,
>              "Name": "cpu0_vrd_temp",
>              "Thresholds": [
>                  {
>                      "Direction": "greater than",
>                      "Name": "upper critical",
>                      "Severity": 1,
>                      "Value": 80
>                  }
>              ],
>              "Type": "TMP75"
>          }
>      ],
>      "Name": "Rudra Baseboard",
>      "Probe": "xyz.openbmc_project.FruDevice({'PRODUCT_PRODUCT_NAME': 
> 'RUDRA'})",
>      "Type": "Board",
>      "xyz.openbmc_project.Inventory.Decorator.Asset": {
>          "Manufacturer": "$BOARD_MANUFACTURER",
>          "Model": "$BOARD_PRODUCT_NAME",
>          "PartNumber": "$BOARD_PART_NUMBER",
>          "SerialNumber": "$BOARD_SERIAL_NUMBER"
>      }
> }
> 
> Wrote sample FRU information on eeprom with the following content. Used 
> dd command for writing to eeprom.
> 
> root at s2600wf:/sys/bus/i2c/devices/3-0056# cat eeprom
> Product:
>    MANUFACTURER  "ABC"
>    PART_NUMBER   "12345"
>    PRODUCT_NAME  "SAMPLENAME"
>    SERIAL_NUMBER "12312490840"

This is not a legal IMPI FRU. FRU Device only allows legal fru based on 
the spec: 
https://www.intel.com/content/www/us/en/servers/ipmi/ipmi-platform-mgt-fru-infostorage-def-v1-0-rev-1-3-spec-update.html

For testing purposes using "Probe" : "TRUE" can be used as well.
> 
> The dbus tree not showing /xyz/openbmc_project/FruDevice/SAMPLENAME
> 
> root at s2600wf:~# busctl tree --no-pager xyz.openbmc_project.FruDevice
> `-/xyz
>    `-/xyz/openbmc_project
>      `-/xyz/openbmc_project/FruDevice
> 
> In journalctl log the following messages are printed.
> 
> systemd[1]: Started Hwmon Temp Sensor.
> hwmontempsensor[120]: Error communicating to entity manager
> hwmontempsensor[120]: error communicating to entity manager
> 
> Look like FruDevice daemon is not parsing the contents of eeprom and 
> publish them to dbus.
> 
> Is there any thing missing in configuration? Please help to resolve the 
> problem.
> 
> 
> 
> Thanks,
> 
> Akash
>