From: "Tim Lewis" <tim.lewis@insyde.com>
To: "'Kinney, Michael D'" <michael.d.kinney@intel.com>,
<devel@edk2.groups.io>
Subject: Re: [edk2-devel] How to assign NULL to a VOID* PCD?
Date: Wed, 16 Dec 2020 13:30:06 -0800 [thread overview]
Message-ID: <04b301d6d3f2$a107aef0$e3170cd0$@insyde.com> (raw)
In-Reply-To: <BL0PR11MB32368799F9B2C2EC359238C6D2C50@BL0PR11MB3236.namprd11.prod.outlook.com>
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Mike –
I understand, but this just adds another layer of complexity. For example, we had a list of exception numbers (0x00-0xff) and then had to move away from UINT8 because it couldn’t hold a terminating or illegal value. We prefer to use PcdGetSize. It may be something we will change in our own codebase.
Tim
From: Kinney, Michael D <michael.d.kinney@intel.com>
Sent: Wednesday, December 16, 2020 1:28 PM
To: devel@edk2.groups.io; tim.lewis@insyde.com; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: RE: [edk2-devel] How to assign NULL to a VOID* PCD?
Hi Tim,
Assigning NULL to a VOID* PCD is not supported.
I recommend you design the structure that the VOID* type PCD points to be self describing. You can put a count field or if it is an array, use can use a tag in a field to mark the end of the array.
Mike
From: devel@edk2.groups.io <mailto:devel@edk2.groups.io> <devel@edk2.groups.io <mailto:devel@edk2.groups.io> > On Behalf Of Tim Lewis
Sent: Wednesday, December 16, 2020 11:06 AM
To: devel@edk2.groups.io <mailto:devel@edk2.groups.io>
Subject: [edk2-devel] How to assign NULL to a VOID* PCD?
I want the PCD database to contain a NULL to a PCD that is of type VOID* but this does not seem to be allowed in the .dsc files.
In .dec files, I can assign an <Expression> for the value, which lets me put a 0. But the syntax for .dsc files only lets me put data. So for array cases where I want 0 entries, I am always forced to put at least 1 dummy entry. Normally, I would like to use PcdGetSize to get the total array size.
Any pointers?
Thanks,
Tim
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next prev parent reply other threads:[~2020-12-16 21:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 19:05 How to assign NULL to a VOID* PCD? Tim Lewis
2020-12-16 21:28 ` [edk2-devel] " Michael D Kinney
2020-12-16 21:30 ` Tim Lewis [this message]
2020-12-16 23:22 ` Michael D Kinney
2020-12-17 0:06 ` Tim Lewis
2020-12-17 0:56 ` 回复: " gaoliming
2020-12-17 1:03 ` Tim Lewis
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