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

["Edward Pickup" <edward.pickup@arm.com>]

Hello Collin, thank you for your comments

On 27/04/2022 12:36, Ard Biesheuvel wrote:
> 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.
>
After some internal discussions there was a miscommunication here. There 
is not a limit here, and the correct value should be 64. I will prepare 
a v2 patch with this change and send it out later today.
>> 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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