PCIe NVME drives not detected on Dell R6515

I already asked on stable_at_ but as I tried it on 13-CURRENT with the same 
result I am trying to ask for help here.

I have rented dedicated server Dell PowerEdge R6515 with iDRAC access only.
There are 2 NVME drives which I wanted to use as ZFS root pool.

They are shown in iDRAC

Device Description:   PCIe SSD in Slot 1 in Bay 1
Device Protocol:      NVMe-MI1.0
Model:                Dell Express Flash NVMe P4510 1TB SFF
Bus:                  130
Manufacturer:         INTEL
Product ID:           a54
Revision:             VDV1DP23
Enclosure:            PCIe SSD Backplane 1


pciconf -l show many things, some of them are named "noneN_at_pci..." but 
none "nvme"

The is printscreen (12.1 but 13-CURRENT is the same)

https://ibb.co/tPnymL7

But I booted Linux SystemRescueCd and nvme devices are there visible in 
/dev/
https://ibb.co/sj22Nwg

There is verbose output of Linux lspci https://ibb.co/dPZTwV1

Linux dmesg contains:
nvme nvme0: pci function 0000:81:00.0
nvme nvme1: pci function 0000:82:00.0
nvme nvme0: 32/0/0 default/read/poll queues
nvme nvme1: 32/0/0 default/read/poll queues


The machine is Dell PowerEdge R6515 with AMD EPYC 7302P


More details extracted from iDRAC web interface

I found this informations

PCIe SSD in Slot 1 in Bay 1
Bus:   82
BusProtocol:  PCIE
Device:  0
DeviceDescription:  PCIe SSD in Slot 1 in Bay 1
DeviceProtocol:  NVMe-MI1.0
DeviceType:  PCIeSSD
DriveFormFactor:  2.5 inch
FailurePredicted:  NO
FQDD:  Disk.Bay.1:Enclosure.Internal.0-1
FreeSizeInBytes:  Information Not Available
Function:  0
HotSpareStatus:  Information Not Available
InstanceID:  Disk.Bay.1:Enclosure.Internal.0-1
Manufacturer:  INTEL
MaximumCapableSpeed:  8 GT/s
MediaType:  Solid State Drive
Model:  Dell Express Flash NVMe P4510 1TB SFF
NegotiatedSpeed:  8 GT/s
PCIeCapableLinkWidth:  x4
PCIeNegotiatedLinkWidth:  x4
PrimaryStatus:  Ok
ProductID:  a54
RaidStatus:  Information Not Available
RAIDType:  Unknown
RemainingRatedWriteEndurance:  100 %
Revision:  VDV1DP23
SerialNumber:  PHLJxxxxxxWF1PxxxxN
SizeInBytes:  1000204886016
Slot:  1
State:  Ready
SystemEraseCapability:  CryptographicErasePD

PCIe SSD in Slot 1 in Bay 1 - PCI Device
BusNumber:  130
DataBusWidth:  4x or x4
Description:  Express Flash NVMe 1.0 TB 2.5" U.2 (P4510)
DeviceDescription:  PCIe SSD in Slot 1 in Bay 1
DeviceNumber:  0
DeviceType:  PCIDevice
FQDD:  Disk.Bay.1:Enclosure.Internal.0-1
FunctionNumber:  0
InstanceID:  Disk.Bay.1:Enclosure.Internal.0-1
LastSystemInventoryTime:  2020-04-17T03:21:39
LastUpdateTime:  2020-03-31T13:55:06
Manufacturer:  Intel Corporation
PCIDeviceID:  0A54
PCISubDeviceID:  2003
PCISubVendorID:  1028
PCIVendorID:  8086
SlotLength:  2.5 Inch Drive Form Factor
SlotType:  PCI Express Gen 3 SFF-8639


Can anybody shed some light what the real problem is?

Is the hardware not properly detected or is the driver completely missing?

NVME PCIe architecture is out of my knowledge.

I really appreciate any help.

Kind regards
Miroslav Lachman