Re: [edk2-devel] Memory Attribute for depex section

["Nhi Pham via groups.io" <nhi=os.amperecomputing.com@groups.io>]

++ discuss@edk2.groups.io

On 1/8/2024 5:11 PM, Nhi Pham wrote:
> Hi Ard, all,
> 
> Could you please help explain how the depex section in an image is
> mapped in terms of memory attribute?
> 
> As my observation, dispatcher locates[1] the depex section inside the
> module image and write[2] an evaluated data to the depex if necessary
> for scheduled boot order. The problem that the depex section is now in
> RO+X memory due to a part of the module image, so a writing to depex
> would cause data abort. I'm unsure whether this issue is generic in EDK2
> or not.
> 
> I think of two approaches:
> 
> #1 Relocate the depex section to heap memory for dependency evaluation?
> 
> #2 EDK2 build tool to support granting write permission for depex section.
> 
> [1] StandaloneMmPkg/Core/FwVol.c:236
> [2] StandaloneMmPkg/Core/Dependency.c:256
> 
> Thanks,
> Nhi



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