Thanks,
I am still struggling with what the right thing is, though.
It seems to me that if the driver is the one to use the PCD in a way that
requires that this PCD resolve to a Dynamic type (not a FixedAtBuild type).
And if the DEC file provided options for the PCD,
i.e. [PcdsFixedAtBuild,PcdsPatchableInModule,PcdsDynamic] like is
referenced earlier.
Then the INF file ought to be the one to restrict the possible PcdType for
this PCD.
But in the INF file this PCD is in a [Pcd] section, which in the INF
specification is the correct section for Dynamic types, but in this case
the PcdType is not being resovled to PcdsDynamic but rather to
PcdsFixedAtBuild.
In this case there was no reference to the PCD in a DSC file, but shouldn't
the type get resolved by the INF, since it used a [Pcd] section?
-chip
On Wed, Aug 28, 2013 at 8:21 PM, Zeng, Star <star.z...@intel.com> wrote:
> Hi Chip,****
>
> ** **
>
> FixedAtBuild PCD: ****
>
> The value of this PCD type is determined****
>
> at build time and is stored in the code section of a module’s PE image.***
> *
>
> ** **
>
> Yes, the PCD is required not to be configured as FixedAtBuild, if a driver
> that wants to do a set on the PCD.****
>
> ** **
>
> ** **
>
> Thanks.****
>
> Star****
>
> *From:* Chip Ueltschey [mailto:chipj...@gmail.com]
> *Sent:* Thursday, August 29, 2013 10:42 AM
> *To:* edk2-devel@lists.sourceforge.net
> *Subject:* Re: [edk2] Mixed Section Types for PCD****
>
> ** **
>
> 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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