On Aug 28, 2013, at 5:31 PM, Tim Lewis <tim.le...@insyde.com> wrote:
> Chip –
>
> It is legal. The types that are listed in the .dec file limit the types that
> a .dsc file can use. If none is specified in the .dsc file, then the first
> one will be used by default. So, for example, you may want to allow a .dsc
> file to support either Dynamic, DynamicEx or FixedAtBuild. So the .dec file
> lists all three. But if the .dsc file tries to use Patchable, it will fail.
>
This is the best way to think about it. Lets say I'm building for a ATM that
does not have setup. In my DSC file I'll set a lot of the PCDs to FixedAtBuild.
But some PC OEM that supports over-clockers may want to to make a large number
of parameters configurable in setup. The concept of PCD is the driver has these
generic hook points for configuration, but the platform builder gets to chose
what knobs get exposed. In this example the CPU and Chipset drivers code does
not have to change between the zero setup platform and the uber setup platform.
That is the concept behind allowing the platform to chose the type of the PCD.
> So Set will not work on FixedAtBuild, right, because it is defined as CONST.
> So you need to change the type in the .dsc file to Dynamic or DynamicEx or
> Patchable (actually, I’m not sure if Patchable generates a CONST or not)
>
Yes it does but Patchable is for a binary and the patching is done by a build
tool.
Thanks,
Andrew Fish
> Tim
>
> From: Chip Ueltschey [mailto:chipj...@gmail.com]
> Sent: Wednesday, August 28, 2013 5:26 PM
> To: edk2-devel@lists.sourceforge.net
> Subject: [edk2] Mixed Section Types for PCD
>
> Is it legal to do this in a DEC file?
> [PcdsFixedAtBuild,PcdsPatchableInModule,PcdsDynamic]
>
> That seems suspect since a PcdsFixedAtBuild type will not allow set, but a
> PcdsDynamic will allow set.
> What is AutoGen supposed to do?
> Currently, I have an error where the C code wants to set a PCD in this
> section.
>
> Thanks,
> -chip
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