Since my last email, I was able to write platform-specific code that can
access the firmware from an X64 platform and extract it. Is there a way to
extract and/or dissect the FV or FVs that have the SEC and PEI Core for a
given .FD or .ROM file (assume I have no corresponding .FDF file and do not
know the structure)? The goal here is to do some integrity checks on key
files or modules that are consistent and do not change (unless they are
updated). I want to ignore sections of the ROM that have volatile data that
changes frequently such as firmware settings changes, the clock, etc..
Thanks.
On Mon, Dec 3, 2012 at 5:35 PM, Andrew Fish <[email protected]> wrote:
> UEFI is focused on defining the interfaces to option ROMs and OS loaders,
> and pushing policy decisions, where possible, in the platform firmware.
> UEFI tends to not define how the construct the platform Firmware. The UEFI
> PI specs go into more detail of firmware construction, but mostly so
> modules can interoperate. PI does not focus on things that are higher level
> platform firmware features.
>
> The PI terminology is FD (Flash Device) and there is no way to access the
> FD programmatically. The platform firmware produces FVs (Firmware Volumes)
> out of the FD in PEI (memory discovery/S3) and DXE (EFI services) phases.
> The FV containing the SEC and PEI Core are often executed directly from the
> FD, but most other FVs are compressed. This is all done via platform
> specific code.
>
> Andrew Fish
>
>
> On Dec 3, 2012, at 2:24 PM, cruxpot wrote:
>
> > Hi there,
> >
> > I am wondering if there are any calls in edk2 or the UEFI spec to locate
> the system's BIOS code and dump it to disk or some other medium. I want to
> implement this in a UEFI driver. I have seen plenty of information
> regarding option ROMs in the spec and driver guide but not on the BIOS
> code. If I missed it, please point me to the right resources.
> >
> > Thanks
> >
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