U-boot Rock 5C - ethernet

Happy new year everyone!

I’m trying to netboot a Rock 5C lite and I would like to know from where to start.
I’ve flashed the SPI flash module with the corresponding spi image.

When powering my device without any SD card / eMMC (only SPI) U-boot displays the following output:

U-Boot rknext-2017.09-1-g1ea6843-dirty # (Jul 02 2024 - 18:16:36 +0000)

Model: Radxa ROCK 5C
MPIDR: 0x81000000
PreSeria16 GiB
Sysmem: init
Relocation Offset: eda3a000
Relocation fdCR: M/C/I
Using default environment

DM: v2
JEDEC id bytes: c2, 25, 38
SF: Detected sfc_nor with paBootdev(atags): mtd 2
## Unknown partition table type 0
PartTytition
Failed to load DTB, ret=-2
No valid DTB, ret=-22
Failestarting USB...
Bus usb@fc800000: USB EHCI 1.00
Bus usb@fc840000: USB OHCI 1.0
Bus usb@fc880000:USB EHCI 1.00
Bus usb@fc8c0000: USB OHCI 1.0
scanning bus usb@2 USB Device(s) found
scanning bus usb@fc840000 for devices... 1 USB Device(s) found
scanning bus usb@fc880000 for devices... 1 USB Device(s) found
scanning bus usb@fc8c0000 for devices... 1 USB Device(s) found
       scanning usb for storage devices..CLK: (sync kernel. arm: enter 1008000 KHz, init 1008000 KHz, kernel 0N/A)
  b0pll 24000 KHz
  000 KHz
  ppll 1100000 KHz
  aclk_center_root 702000 KHz
  pc
  aclk_low_top_root 396000 KHz
Net:   No ethernet found.
Hit Ctrl+C key in 0 seconds to stopnknown device
no mmc device at slot 1
pcie@fe190000: PCIe Linking... LTSSM is 0x0
pcie@fe190000: PCIe Linking... LTSSM is 0x0
pcie@fe190000: PCIe Linking... LTSSM is 0x2
pcie@fe190000: PCIe Linking... LTSSM is 0x2
pcie@fe190000: PCIe Linking... LTSSM is 0x3
...
pcie@fe190000: PCIe Linking... LTSSM is 0x3
pcie@fe190000: PCIe-0 Link Fail

Device 0: unknown device
pci
no mmc device at slot 0

Device 2: Vendor: 0x2207 Rev: V1.00** No partition table - mtd 2 **

Device 1: unknown raw ID 25 38 c2

Device 0: unknown devicxeuuid
missing environment variable: bootfile
Retrieving file: pxelinux.cfg/00000000
No ethervironment variable: bootfile
Retrieving file: pxelinux.cfg/000000
No ethernet found.
missing ootfile
Retrieving file: pxelinux.cfg/0000
No ethernet found.
missing environment variable: bpxelinux.cfg/00
No ethernet found.
missing environment variable: bootfile
Retrieving file: pxhip
No ethernet found.
missing environment variable: bootfile
Retrieving file: pxelinux.cfg/default-arm
No ethernet found.
pcie@fe190000: failed to find reset-gpios property
No ethernet image
Unknown command 'bootrkp' - try 'help'

It seems that it does not consider my ethernet whereas it is connected to a switch.
Would it be a u-boot configuration issue?

BR