> On May 5, 2015, at 11:26 AM, Duran, Leo <leo.du...@amd.com> wrote:
>
> Of course, I meant:
>
> I’m declaring a Pcd with some default value as
> [PcdsPatchableInModule.common], and here are my observations:
> 1) In PEIM module1 after PcdSetXX() with a new value and can read back
> the new value with PcdGetXX()
> 2) However, from PEIM module2 (which runs later) PcdGetXX() returns the
> default declared value
>
> Question: Is there a way to invoke PcdSetXX() so that the new value is
> persistent across modules?
>
PatchableInModule means patching a binary is supported. Dynamic means lookup
the value in a database (via Pcd PPI, and Protocoli ) and sharing it across
modules.
As Tim mentioned by using Patchable you are scoping the PCD value to be
compiled into your module, so a different location for every setting. Changing
that value does not update other modules.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Include/Library/PcdLib.h
#define PatchPcdSet8(TokenName, Value) (_gPcd_BinaryPatch_##TokenName =
(Value))
You need to define the PCD to a [PcdsDynamicDefault.common] in your DSC file.
This means all the values come from this PEIM
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Universal/PCD/Pei/
and all the other modules will use the PCD PPI to get/set PCD values. The PCD
macro in the PEIM ends up calling a library call that abstracts the PCD PPI
call.
Thanks,
Andrew Fish
> Thanks,
> Leo.
>
>
> From: Duran, Leo
> Sent: Tuesday, May 05, 2015 12:49 PM
> To: 'edk2-devel@lists.sourceforge.net'
> Subject: Question about SetPcd
>
> I’m declaring a Pcd with some default value as
> [PcdsPatchableInModule.common], and here are my observations:
> 1) In PEIM module1 after SetPcdXX() with a new value and can read back
> the new value with GetPcdXX()
> 2) However, from PEIM module2 (which runs later) GetPcdXX() returns the
> default declared value
>
> Question: Is there a way to invoke SetPcdXX() so that the new value is
> persistent across modules?
>
> Thanks,
> Leo.
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