Read smbios2 file failed

[CS20 CHLi30]

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 [mailto:openbmc-bounces+chli30=nuvoton.com at lists.ozlabs.org] On Behalf Of Garrett, Mike (HPE Server Firmware)
Sent: Wednesday, September 15, 2021 9:19 PM
To: Andrei Kartashev <a.kartashev at yadro.com>; Thang Nguyen <thang at amperemail.onmicrosoft.com>; openbmc <openbmc at lists.ozlabs.org>
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:  https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fopenbmc%2Fsmbios-mdr%2Fblob%2F33c948a473bd273fea0cff82d4c99b70b7784be6%2Finclude%2Fsmbios_mdrv2.hpp%23L114&data=04%7C01%7Cchli30%40nuvoton.com%7C81a4bd29e4904bf4d84608d978510b92%7Ca3f24931d4034b4a94f17d83ac638e07%7C0%7C0%7C637673526954552742%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=oQwcozsSoGlgSFwztPFV3FAoPpRZGYoZ7pc0%2BxDi1MA%3D&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-
> bounces+mike.garrett=hpe.com at lists.ozlabs.org> On Behalf Of Andrei
> Kartashev
> Sent: Wednesday, September 15, 2021 3:17 AM
> To: Thang Nguyen <thang at amperemail.onmicrosoft.com>; openbmc
> <openbmc at lists.ozlabs.org>
> 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:
> INVALID URI REMOVED
> 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:
> > > > > https://apc01.safelinks.protection.outlook.com/?url=https%3A%2
> > > > > F%2Fgithub.com%2Fopenbmc%2Fintel-ipmi-&data=04%7C01%7Cchli
> > > > > 30%40nuvoton.com%7C81a4bd29e4904bf4d84608d978510b92%7Ca3f24931
> > > > > d4034b4a94f17d83ac638e07%7C0%7C0%7C637673526954552742%7CUnknow
> > > > > n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik
> > > > > 1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=cG6ZZzOSXkuUtcQuuoymsRdP
> > > > > p24mINa%2FhCy%2BYhe%2FNmk%3D&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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