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From: Thang Nguyen <>
To: CS20 CHLi30 <>,
	"Garrett, Mike (HPE Server Firmware)" <>,
	Andrei Kartashev <>,
	openbmc <>
Subject: Re: Read smbios2 file failed
Date: Thu, 16 Sep 2021 18:18:39 +0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Thanks Tim, Mike and Andrei for very useful information. We can make it 
work by adding MDRv2 header.

I am finding some information about the IPMI blobs commands. I can see 
some notes at

But I have not found more description about the IPMI blob commands like 
NetFn, Func, ... that I can send a file from Host to BMC. Do you have 
any information about them?


Thang Q. Nguyen

On 16/09/2021 09:40, CS20 CHLi30 wrote:
> Hi Thang,
> Did you try to use smbios_entry_point or DMI from host to BMC /var/lib/smbios/smbios2 for parsing?
> You can refer this sysfs-firmware-dmi-tables as below:
> The firmware provides DMI structures as a packed list of data referenced by a SMBIOS table entry point.
> The SMBIOS entry point contains general information, like SMBIOS version, DMI table size, etc.
> The structure, content and size of SMBIOS entry point is dependent on SMBIOS version.
> The format of SMBIOS entry point and DMI structures can be read in SMBIOS specification.
> The dmi/tables provides raw SMBIOS entry point and DMI tables through sysfs as an alternative to utilities reading them from /dev/mem.
> The raw SMBIOS entry point and DMI table are presented as binary attributes and are accessible via:
> /sys/firmware/dmi/tables/smbios_entry_point
> /sys/firmware/dmi/tables/DMI
> Best regards,
> Tim
> -----Original Message-----
> From: openbmc [] On Behalf Of Garrett, Mike (HPE Server Firmware)
> Sent: Wednesday, September 15, 2021 9:19 PM
> To: Andrei Kartashev <>; Thang Nguyen <>; openbmc <>
> Subject: RE: Read smbios2 file failed
> We recently did the same thing and got it working.  All you have to do is take the RAW smbios records blob in binary form (delivered as noted below in whatever way you choose) and prepend a specific header:;;sdata=oQwcozsSoGlgSFwztPFV3FAoPpRZGYoZ7pc0%2BxDi1MA%3D&amp;reserved=0
> It is a little bit fragile as it introduces a dependency on the file download logic to write a non-standard header defined in another service that could potentially change.
> Mike
>> -----Original Message-----
>> From: openbmc <openbmc-
>>> On Behalf Of Andrei
>> Kartashev
>> Sent: Wednesday, September 15, 2021 3:17 AM
>> To: Thang Nguyen <>; openbmc
>> <>
>> Subject: Re: Read smbios2 file failed
>> I don't know what is format of "dmidecode --dump-bin", but if it just
>> raw dump of smbios then you only need to add mdr header.
>> See answer for the same question here:
>> 021-July/026882.html__;!!NpxR!2w0FkPs2KyaB6XOvB8et52bWKqAMLImmL-
>> iUk9A_zZbJ8WLhMeXdvRAp-pcxt8Q$
>> On Wed, 2021-09-15 at 12:41 +0700, Thang Nguyen wrote:
>>> Hi Andrei,
>>> I see output of "dmidecode --dump-bin" follows SMBIOS specification.
>>> As
>>> the data for smbios-mdr does not follow this, do you know about the
>>> document or any information I can reference to prepare data to send
>>> to BMC??
>>> Best Regards,
>>> Thang Q. Nguyen
>>> On 14/09/2021 15:51, Andrei Kartashev wrote:
>>>> No, it is not same as "dmidecode --dump-bin".
>>>> On Tue, 2021-09-14 at 13:46 +0700, Thang Nguyen wrote:
>>>>> On 13/09/2021 23:56, Andrei Kartashev wrote:
>>>>>> You need to somehow deliver smbios data image to BMC. This
>>>>>> means, your BIOS should implementat some logic to transfer
>>>>>> this data.
>>>>>> For BMC side see example here:
>>>>>> d4034b4a94f17d83ac638e07%7C0%7C0%7C637673526954552742%7CUnknow
>>>>>> n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik
>>>>>> 1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=cG6ZZzOSXkuUtcQuuoymsRdP
>>>>>> p24mINa%2FhCy%2BYhe%2FNmk%3D&amp;reserved=0
>> oem/blob/master/src/smbios
>>>>>> mdrv2handler.cpp
>>>>> Hi Andrei,
>>>>> What is the format of smbios data to transfer to BMC? Is it the
>>>>> same content of "dmidecode --dump-bin" command from Host Linux?
>> or
>>>>> anything special in formatting the content to send?
>>>>>> On Mon, 2021-09-13 at 17:40 +0300, Alexander Raih wrote:
>>>>>>> Hi guys, I am beginner in openbmc I build openbmc with
>>>>>>> smbios-mdr repository and I have error:
>>>>>>> Read data from flash error - Open MDRV2 table file failure
>>>>>>> There isnt file in /var/lib/smbios/smbios2
>>>>>>> How I can resolve this problem?
>>>>>>> Help me please!!!
>> --
>> Best regards,
>> Andrei Kartashev
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  reply	other threads:[~2021-09-16 11:19 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 14:40 Alexander Raih
2021-09-13 16:56 ` Andrei Kartashev
2021-09-14  6:46   ` Thang Nguyen
2021-09-14  8:51     ` Andrei Kartashev
2021-09-15  5:41       ` Thang Nguyen
2021-09-15  8:16         ` Andrei Kartashev
2021-09-15 13:18           ` Garrett, Mike (HPE Server Firmware)
2021-09-16  2:40             ` CS20 CHLi30
2021-09-16 11:18               ` Thang Nguyen [this message]
2021-09-16 22:36                 ` Jie Yang
2021-09-17 13:40                   ` Thang Nguyen

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