Re: [edk2-devel] [PATCH v2 0/2] Add support for scanning Option ROMs

["Michael D Kinney" <michael.d.kinney@intel.com>]

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Marcello,

If the assumption in this env is that PCI enumeration has already been done, would it make
more sense for the component that performed PCI enumeration to collect the PCI Option ROM
contents and pass them into the UefiPayLoadPkg in memory buffers and have the PCI Platform Protocol
provide the PCI Option ROM images from these memory buffers?

Thanks,

Mike

From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Marcello Sylvester Bauer
Sent: Monday, September 21, 2020 6:25 AM
To: Ni, Ray <ray.ni@intel.com>
Cc: devel@edk2.groups.io
Subject: Re: [edk2-devel] [PATCH v2 0/2] Add support for scanning Option ROMs

hi Ray,

> I guess it is because the PciIoDevice->AllOpRomProcessed is set which causes GetPciRom() is skipped.

exactly. Therefore we need this for the gPciPlatformProtocol implementation to work.
I will add this information as a code comment.

> In your UefiPayloadPkg change, you have an assumption that the option ROM BAR still contain the correct base address.
> Is it always true in real world? Do you think maybe the boot loader should supply a MMIO space range so UeifPayloadPkg
> can use for option rom decoding?

Every option ROM in coreboot does have it's own memory space and can not be provided as MMIO space range. Probably we could
add some kind of validation to verify the validity of the base address.

thanks,
Marcello

On Wed, Sep 16, 2020 at 10:28 AM Ni, Ray <ray.ni@intel.com<mailto:ray.ni@intel.com>> wrote:
Why running it will disable the ability of PciPlatform code to scan for ROMs?

I guess it is because the PciIoDevice->AllOpRomProcessed is set which causes GetPciRom() is skipped.

Can you explain more in the code comment?

> -----Original Message-----
> From: devel@edk2.groups.io<mailto:devel@edk2.groups.io> <devel@edk2.groups.io<mailto:devel@edk2.groups.io>> On Behalf Of Marcello
> Sylvester Bauer
> Sent: Tuesday, September 15, 2020 8:26 PM
> To: devel@edk2.groups.io<mailto:devel@edk2.groups.io>
> Subject: [edk2-devel] [PATCH v2 0/2] Add support for scanning Option ROMs
>
> Fix Option ROM enumeration and support scanning.
>
> v2:
> * add correct Maintainer and Reviewer to Cc
> * PciPlatformDxe:
>   - Update description
>   - add function description
>
> Branch: https://github.com/9elements/edk2-1/tree/UefiPayloadPkg-
> Option_ROMs
> PR: https://github.com/tianocore/edk2/pull/926
>
> Patrick Rudolph (2):
>   MdeModulePkg: Fix OptionROM scanning
>   UefiPayloadPkg: Scan for Option ROMs
>
>  UefiPayloadPkg/UefiPayloadPkgIa32.dsc                 |   1 +
>  UefiPayloadPkg/UefiPayloadPkgIa32X64.dsc              |   1 +
>  UefiPayloadPkg/UefiPayloadPkg.fdf                     |   1 +
>  UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.inf      |  46 +++
>  UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.h        |  19 +
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c |  10 +-
>  UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.c        | 426
> ++++++++++++++++++++
>  7 files changed, 500 insertions(+), 4 deletions(-)
>  create mode 100644 UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.inf
>  create mode 100644 UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.h
>  create mode 100644 UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.c
>
> --
> 2.28.0
>
>
>


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[Marcello Sylvester Bauer]

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