Read FRU of host through ipmi in Entity manager.

[Ed Tanous]

On Mon, Sep 14, 2020 at 9:57 AM Kumar Thangavel <thangavel.k at hcl.com> wrote:
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> Classification: HCL Internal
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> Hi All,
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>          We are working on the Platform which has multi host and the host are FRUs.  The host and BMC communication is based on IPMB. We have each host is connected in separate ipmb bus.
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>          Existing Entity manager has the FRU read info from EEPROM (I2C)in the form of bin file.
>          We understand that entity manager does not support ipmb based host fru.

Minor adjustment.  FruDevice has this capability, not Entity Manager.

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>          So, we are proposing the design to support ipmb based FRU in entity manager.
>          From Entity manager, we will send the generic "read host fru" command request to ipmbbrige to read the host FRU.
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>          Then, store the host fru info in the bin file to process and creating dbus objects in the entity manager.

Minor amendment again.  I'd much rather the IPMBSensor daemon simply
create the same interface that fru device does, rather than adding
IPMB logic to FruDevice.  In this way, platforms that don't have IPMB
don't need to include the feature at all.  Also, all the IO can be
managed in one place.
https://github.com/openbmc/dbus-sensors/blob/master/src/IpmbSensor.cpp
Ideally, your IPMB device would also have an SDR that details what
FRUs and sensors exist, so that the inventory can be read and posted
to DBus at startup.  If they don't then we might need a static mapping
from an EM config once the device on the other end is detected via get
device ID.


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>          Please let us know your comments on this.
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> Thanks,
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> Kumar.
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