> On Jun 2, 2015, at 11:50 AM, Tomaz Fogaça <tom.fog...@gmail.com> wrote: > > Hello everyone, > > I'm writing this application for UEFI using the UDK and in it I'm trying to > gather some information from the SMBios table. > > I'm trying to reach the System Event Log, and in order to do that I've > decoded the System Event Log(Type 15) structure and found that, in my > machine, the field "Access Method" has a value of '4', which, according to > the SMBios spec, means "Available through General-Purpose NonVolatile Data > functions." > > I have little to no idea of what "General-Purpose NonVolatile Data functions" > are. I've looked into the Linux kernel source only to find that it explicitly > does not support such access method, so I cannot use that as a reference. > > The only other reference to the term 'gpnv' that I could find was in an old > SMBios spec, which references something called "Plug and Play functions", > which I also am not familiar with. > > I'd appreciate any help regarding these questions: > 1 - What are "General-Purpose NonVolatile Data functions”?
They are the old “legacy BIOS” Plug and Play functions that are callable in real-mode, and 16-bit protected-mode. > 2 - How do I use them? You go back in time to 1994: ftp://download.intel.com/support/motherboards/desktop/sb/pnpbiosspecificationv10a.pdf <ftp://download.intel.com/support/motherboards/desktop/sb/pnpbiosspecificationv10a.pdf> Older versions of the SMBIOS spec talk about the functions, like the one from 1999: http://www.dmtf.org/sites/default/files/standards/documents/DSP0119.pdf <http://www.dmtf.org/sites/default/files/standards/documents/DSP0119.pdf> > 3 - Is there any UDK api to handle them? > No. This is likely a bug in the SMBIOS table, as these functions got obsoleted a while ago. Thanks, Andrew Fish > > Thank you very much. > Tomaz > ------------------------------------------------------------------------------
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