[BUG]ethernet of odroid-n2 or odroid-c4 does not work in actual master build

[Karl-opec]

Describe the bug

ethernet is not working for odroid c4 and odroid-n2 boards

Informations

• LE master commit bbbb726
• odroid-n2 and odroid-c4

Additional context

removing

amlogic-0155-WIP-arm64-dts-meson-switch-ODROID-N2-to-rgmii-id.patch
amlogic-0156-WIP-arm64-dts-meson-switch-ODROID-C4-to-rgmii-id.patch

in amlogic patches linux fixes the bug.

[chewitt]

You need to better define "not working" because I've been working from N2/C4 in recent days without issues. Note that I am also using the current 2020.04 u-boot we bundle into images: http://ix.io/2rbQ

[Karl-opec]

Ethernet not working means: it does not communicate over ethernet. interface eth0 is there but it can't get an ip from dhcp it assigns the dummy ip 169.xxx.xxx.xxx to eth0. The change of phy-Mode to rgmii-id seams to break something. I use the uboot which is build by building the above git master image.

I see you run on 100MB, I run 1GB Network, perhaps this might be the issue?
The following part of dmesg is with working 1GB Network after changing phy to rgmii.

`
[ 4.305988] RTL8211F Gigabit Ethernet 0.0:00: 2ns TX delay was already disabled (by pin-strapping RXD1 or bootloader configuration)

[ 4.306484] RTL8211F Gigabit Ethernet 0.0:00: 2ns RX delay was already disabled (by pin-strapping RXD0 or bootloader configuration)

[ 4.306699] meson8b-dwmac ff3f0000.ethernet eth0: PHY [0.0:00] driver [RTL8211F Gigabit Ethernet] (irq=28)

[ 4.321389] meson8b-dwmac ff3f0000.ethernet eth0: No Safety Features support found

[ 4.321403] meson8b-dwmac ff3f0000.ethernet eth0: PTP not supported by HW

[ 4.321411] meson8b-dwmac ff3f0000.ethernet eth0: configuring for phy/rgmii link mode

[ 7.766789] meson8b-dwmac ff3f0000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

[ 7.766817] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
`

[chewitt]

Closing after #4949 bumps everything to a current state again