Re: Modifying GRUB to read DMI data

[W. Michael Petullo]

> > I am interested in modifying GRUB to read DMI data from my BIOS
> > (i.e., the data dmidecode reads). The SMBIOS specification seems to
> > state that the Plug-n-Play function interface is deprecated while the
> > table-based interface requires a processor running in 32- or 64-bit
> > protected mode. Does anyone know where I could find information on a
> > non-deprecated method to read DMI data while in real mode?
>
> But you just said this can be done by parsing tables in i386 32-bit  
> mode,
> why not just do that?
>
> Btw, which information do you need to obtain from there?

I was under the impression that the DMI tables could be stored above  
1MB, and that these memory locations were not easily accessible when  
in real mode.

I have now found that, at least in my hardware's case, the DMI tables  
are below 1MB and easily read. Is this the case for all hardware?

I have a client that has a piece of hardware that provides an  
electronic key via DMI when a physical key is inserted into the  
device. I am writing a command that will read that key and store it  
in GRUB's environment for Michael Gorven's LUKS module to pick up.

Mike