Ok, interesting, thanks.
What if I have a driver that wants to do a set on the PCD.
The driver can't do that if the build is configured to use the PCD as
FixedAtBuild.
Is there any way to detect this in the C code, or does this driver just
require that the PCD not be configured as FixedAtBuild?
-chip
On Wed, Aug 28, 2013 at 5:51 PM, Andrew Fish <af...@apple.com> wrote:
>
>
> 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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