Platform/Intel/MinPlatformPkg/Pci/Library/PciHostBridgeLibSimple/PciHostBridgeLibSimple.inf for the library of the MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf component. the thing was that my platform would execute through PciEnumerator then PciHostBridgeResourceAllocator then would get stuck when calling the NotifyPhase (PciResAlloc, EfiPciHostBridgeAllocateResources); So I checked the switch case routine looking for the EfiPciHostBridgeAllocateResources literal and I realized the "PciHostBridgeResourceConflict" is as following:

VOID

EFIAPI

PciHostBridgeResourceConflict (

EFI_HANDLE HostBridgeHandle,

VOID *Configuration

)

{

EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;

UINTN RootBridgeIndex;

DEBUG ((DEBUG_ERROR, "PciHostBridge: Resource conflict happens!\n"));

RootBridgeIndex = 0;

Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;

while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {

DEBUG ((DEBUG_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));

for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {

ASSERT (Descriptor->ResType <

sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) / sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])

);

DEBUG ((DEBUG_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",

mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType], Descriptor->AddrLen, Descriptor->AddrRangeMax));

if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {

DEBUG ((DEBUG_ERROR, " Granularity/SpecificFlag = %ld / %02x%s\n",

Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,

((Descriptor->SpecificFlag & EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE) != 0) ? L" (Prefetchable)" : L""

));

}

// Skip the END descriptor for root bridge

ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);

Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) ((EFI_ACPI_END_TAG_DESCRIPTOR *) Descriptor + 1);

}

ASSERT (FALSE);

}