Re: [PATCH edk2-platforms v1 1/1] Platform/ARM: FVP: set IORT RC address limit for FVP RevC

["Ard Biesheuvel" <ardb@kernel.org>]

Hello Edward,

Thanks for the patch.

On Wed, 27 Apr 2022 at 10:59, Edward Pickup <edward.pickup@arm.com> wrote:
>
> When booting Linux on FVP RevC, Linux reports the following error:
>
> ACPI: IORT: [Firmware Bug]: Root complex missing memory address limit
>
> This issue is due to the RC Address Limit not being configured in the
> configuration manager for the platform.
>
> The default model parameter is configured to 32, so set this in the
> configuration manager, fixing the error.
>

Why is 32 a suitable value? I would not expect emulated IP to have
such a limitation.


> Signed-off-by: Edward Pickup <edward.pickup@arm.com>
> ---
>
> The changes can be seen at https://github.com/edpickup/edk2-platforms/tree/1700_fix_IORT_RC_Addr_Limit_v1
>
>  Platform/ARM/VExpressPkg/ConfigurationManager/ConfigurationManagerDxe/ConfigurationManager.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Platform/ARM/VExpressPkg/ConfigurationManager/ConfigurationManagerDxe/ConfigurationManager.c b/Platform/ARM/VExpressPkg/ConfigurationManager/ConfigurationManagerDxe/ConfigurationManager.c
> index 776dec999eb1ef47910835987fa4dae1b69c52fd..560937d7a3addee729148fd6deab2eb82fced9e2 100644
> --- a/Platform/ARM/VExpressPkg/ConfigurationManager/ConfigurationManagerDxe/ConfigurationManager.c
> +++ b/Platform/ARM/VExpressPkg/ConfigurationManager/ConfigurationManagerDxe/ConfigurationManager.c
> @@ -312,7 +312,9 @@ EDKII_PLATFORM_REPOSITORY_INFO VExpressPlatRepositoryInfo = {
>      // ATS attributes
>      EFI_ACPI_IORT_ROOT_COMPLEX_ATS_UNSUPPORTED,
>      // PCI segment number
> -    0
> +    0,
> +    // Memory Address Size Limit
> +    32
>    },
>
>    // Array of Device ID mappings
> --
> Guid("CE165669-3EF3-493F-B85D-6190EE5B9759")
>
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