Identifying platform on sonic

[Shantanu Shrivastava]

Hi Team,
One general question. How does a sonic platform identify which hardware it is. Is configuring hwsku in config_db.json the only way to differentiate?
Or does sonic read some fru number from h/w and save it in config_db?

Regards,

Shantanu

[Samuel Angebault]

Hi,

Usually ONIE (or a bootloader) will populate the /host/machine.conf with platform specific information.
From there a few places will use this information, most notably /etc/rc.local

I've always found the `platform` and `hwsku` kinda confusing,

 - `platform` means your hardware platform which initially comes from /host/machine.conf

    configurations under /usr/share/sonic/device/$platform

 - `hwsku` refers to a default port configuration for your platform which initially comes from minigraph.xml or default_sku

    configurations under /usr/share/sonic/device/$platform/$hwsku

Thanks,

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Samuel Angebault - Staphylo

[Ashwin H]

Hi Samuel,

Thanks for the info. Does that mean we don't read anything from fru eeprom to differentiate the platform in Platform Independent code ?

 Is eeprom contents vendor dependent or is there any format to which fru eeprom needs to be programmed ?

Thanks,

Ashwin

[Samuel Angebault]

Hi Ashwin,

At a later stage of the boot, the system eeprom is being read by SONiC.

If you have the choice, the recommendation is to use the ONIE eeprom format.

If you use the ONIE format things will be painless as you'll just need some glue logic.

We use a different eeprom format and it takes work to make it fit into the model.

You should check these links:

https://github.com/sonic-net/sonic-platform-daemons/blob/master/sonic-syseepromd/scripts/syseepromd

https://github.com/sonic-net/sonic-platform-common/tree/master/sonic_platform_base/sonic_eeprom

https://github.com/sonic-net/sonic-platform-common/blob/208fe2f82ddfaff181fffe3c118275a39c984b42/sonic_platform_base/chassis_base.py#L82

https://github.com/sonic-net/sonic-utilities/blob/master/scripts/decode-syseeprom

Thanks,

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[Ashwin H]

Hi Samuel,

Thanks for the details. I will go thru this and come back if i have any questions.

Thanks,

Ashwin