Re: SMBios configuration table not present until late stage of boot

[<Jim.Dailey@dell.com>]

It is a tricky problem.

What I would like is for a new protocol to be defined, which should
not rely on devices, to contain certain identifying information
like this that would be useful to device drivers. It could be
created early in DXE.

What I fear is some future requirement that SMBIOS be made available
at some definitive time pre-OS boot.

You may have to get support from the BIOS vendor. If you are doing a
driver for a particular system, that might not be too bad of a
solution; but if you're trying to develop some generic driver, I
don't have a good suggestion.

Regards,
Jim

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Tomas Pilar (tpilar)
Sent: Thursday, May 18, 2017 10:14 AM
To: Dailey, Jim <Jim_Dailey@Dell.com>
Cc: edk2-devel@lists.01.org
Subject: Re: [edk2] SMBios configuration table not present until late stage of boot

This does make sense. Do you have a suggestion how I would go about 
finding/creating a unique identifier for the system during preboot?

Cheers,
Tom

On 18/05/17 16:11, Jim.Dailey@dell.com wrote:
> Not a helpful comment, but I wanted to air my feelings on the topic:
>
> I view SMBIOS as data strictly for OS-level consumption and not for
> any pre-boot code.  I'm sure I'm in the minority, however.
>
> One of the problems is that the BIOS needs to have scanned all
> devices/resources and perhaps executed a connect all before the
> tables can be generated (or at least completed).
>
> Regards,
> Jim
>
> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Tomas Pilar (tpilar)
> Sent: Thursday, May 18, 2017 10:01 AM
> To: edk2-devel@lists.01.org
> Subject: [edk2] SMBios configuration table not present until late stage of boot
>
> Hi,
>
> I am trying to read the system UUID from the System Table (Type 1) in
> the SMBios set of tables. I am doing this during DriverBinding.Start()
> part of the UEFI_DRIVER initialisation. Unfortunately the
> gST->ConfigurationTable only contains 6 tables and SMBios is not one of
> them.
>
> Once I boot into UEFI shell or start a PXE booting process, the
> gST->ConfigurationTable now contains 8 tables and SMBios is one of the
> two new tables. If I however only boot to a HDD, this never seems to
> happen.
>
> Can someone offer some insight why this might be so and how would I go
> about forcing the platform to provide the SMBios in
> gST->ConfigurationTable at a sensible point?
>
> Incidentally it seems ExitBootServices is not signaled on this platform
> if the boot goes through to HDD either, which is another strange thing ...
>
> Cheers,
> Tom
>
>
>
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