[edk2-devel] Memory Attribute for depex section

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

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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