After upgrading my Odroid-C1 kernel from 4.18 to 4.19, integrated network interface doesn't work anymore.
Dmesg says
$this->bbcode_second_pass_code('', 'meson8b-dwmac c9410000.ethernet: User ID: 0x10, Synopsys ID: 0x37
meson8b-dwmac c9410000.ethernet: DWMAC1000
meson8b-dwmac c9410000.ethernet: DMA HW capability register supported
meson8b-dwmac c9410000.ethernet: RX Checksum Offload Engine supported
meson8b-dwmac c9410000.ethernet: COE Type 2
meson8b-dwmac c9410000.ethernet: TX Checksum insertion supported
meson8b-dwmac c9410000.ethernet: Wake-Up On Lan supported
meson8b-dwmac c9410000.ethernet: Normal descriptors
meson8b-dwmac c9410000.ethernet: Ring mode enabled
meson8b-dwmac c9410000.ethernet: Enable RX Mitigation via HW Watchdog Timer
libphy: stmmac: probed
mdio_bus stmmac-0: MDIO device at address 0 is missing.')
And when trying to bring up the interface
$this->bbcode_second_pass_code('', '# ip link set dev eth0 up
meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
meson8b-dwmac c9410000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)
RTNETLINK answers: No such device')