I350 igb driver failed with error -2

Dear Support,

My setup is the following, I have a I350 connected to an arm based board (Jetson) over PCIe. On port0 of the I350 there is an external PHY (DP83TG721) connected over SGMII (rx/tx and MDIO). The external PHY is needed for automotive Ethernet.

I got the EEPROM Access tool and the accompanying flash images. The I350 gets discovered as a PCIe device and I'm able to flash it using the EEPROM tool.

When trying the I350_2-4port_Copper_NO-MNG_1_63 flash image. The igb driver loads correctly and 4 working network interfaces appear, nice.

But the goal is to also get the external PHY working. When trying the I350_2-4port_SGMII_NO-MNG_1_63 flash image for SGMII connection with the PHY the driver fails to load

nvidia@nvidia-desktop:~$ sudo dmesg | grep igb
[ 0.217490] igb: Intel(R) Gigabit Ethernet Network Driver
[ 0.217495] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 0.217520] igbvf: Intel(R) Gigabit Virtual Function Network Driver
[ 0.217526] igbvf: Copyright (c) 2009 - 2012 Intel Corporation.
[ 14.102105] igb 0005:01:00.0: Adding to iommu group 57
[ 14.102411] igb 0005:01:00.0: enabling device (0000 -> 0002)
[ 14.755600] igb: probe of 0005:01:00.0 failed with error -2
[ 14.757712] igb 0005:01:00.1: Adding to iommu group 57
[ 14.757927] igb 0005:01:00.1: enabling device (0000 -> 0002)
[ 15.074173] igb: probe of 0005:01:00.1 failed with error -2
[ 15.074709] igb 0005:01:00.2: Adding to iommu group 57
[ 15.074889] igb 0005:01:00.2: enabling device (0000 -> 0002)
[ 15.815347] igb: probe of 0005:01:00.2 failed with error -2
[ 15.815633] igb 0005:01:00.3: Adding to iommu group 57
[ 15.815756] igb 0005:01:00.3: enabling device (0000 -> 0002)
[ 16.556610] igb: probe of 0005:01:00.3 failed with error -2

While the driver fails the I350 remains discoverable on PCIe

nvidia@nvidia-desktop:~$ sudo lspci -v

...

0005:01:00.0 Ethernet controller: Intel Corporation I350 Gigabit Connection (rev 01)
Flags: fast devsel, IRQ 203, IOMMU group 57
Memory at 2b28000000 (32-bit, non-prefetchable) [size=128K]
I/O ports at 200000 [disabled] [size=32]
Memory at 2b28080000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [70] MSI-X: Enable- Count=10 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 02-00-00-ff-ff-aa-bb-cc
Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
Capabilities: [1a0] Transaction Processing Hints
Capabilities: [1c0] Latency Tolerance Reporting
Capabilities: [1d0] Access Control Services

...

What could be causing the igb driver to fail when using the SGMII config?

To communicate with the external PHY I want to use the MDIO pass-through, are there any additional steps needed to configure this ?

Thank you for any support and insight