gistfile1.txt

EdgeRouter 4:
https://deviwiki.com/wiki/Ubiquiti_Networks_EdgeRouter_4_(ER-4)

Chipset:
https://www.marvell.com/content/dam/marvell/en/public-collateral/embedded-processors/marvell-infrastructure-processors-octeon-iii-cn7130-product-brief-2019.pdf

it has two SGMII from a SOC.
first SGMII is connected to VSC8504 and have 4 (4, 5, 6, 7) ports polulated as described in table bellow.

Which MII it is |	Which MD | Which mdio |	Mac |	Physical port name
mdio-octeon0	octeth0	4	fc:ec:da:03:bf:17	eth3
mdio-octeon0	octeth1	5	fc:ec:da:03:bf:18	eth0
mdio-octeon0	octeth2	6	fc:ec:da:03:bf:19	eth1
mdio-octeon0	octeth3	7	fc:ec:da:03:bf:1a	eth2
mdio-octeon1	-	-	-	

Octeon ubnt_e300(ram)# mii device
MII devices: 'mdio-octeon0' 'mdio-octeon1' 
Current device: 'mdio-octeon0'

Octeon ubnt_e300(ram)# mdio list 
mdio-octeon0:
4 - Vitesse VSC8504 <--> octeth0
5 - Vitesse VSC8504 <--> octeth1
6 - Vitesse VSC8504 <--> octeth2
7 - Vitesse VSC8504 <--> octeth3
mdio-octeon1:

VSC8504 phy is compatible with either Vitesse or Microchip kernel module when patched in.
In later kernels there is just Microchip since it is Vitesse is superseeded by Microchip due to acquision in 2015.
Patching to 5.4 as Vitesse does not require external firmware but patching as Microchip does require one.

root@OpenWrt:/# ls -1 /sys/bus/mdio_bus/drivers/Vitesse\ VSC8504/
8001180000001800:04
8001180000001800:05
8001180000001800:06
8001180000001800:07
bind
uevent
unbind

root@OpenWrt:/# cat /sys/bus/mdio_bus/drivers/Vitesse\ VSC8504/8001180000001800:0*/phy_interface 
sgmii
sgmii
gmii
gmii

stock firmware same command:
root@er4:/home/damex# cat /sys/bus/mdio_bus/drivers/Vitesse\ VSC8504/8001180000001800:0*/phy_interface
sgmii
sgmii
sgmii
sgmii

Interfaces that is detected as sgmii have working network but ones that is detected as gmii is not.

any idea where to proceed?