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Hi all,
on a Lyra Plus with Ubuntu on SD after few seconds the ethernet stop functioning.
dmesg show the followings messages:
[ 13.164009] rk_gmac-dwmac ff4d0000.ethernet: IRQ eth_lpi not found
[ 13.164262] rk_gmac-dwmac ff4d0000.ethernet: supply phy not found, using dummy regulator
[ 13.165103] rk_gmac-dwmac ff4d0000.ethernet: clock input or output? (output).
[ 13.165138] rk_gmac-dwmac ff4d0000.ethernet: Can not read property: tx_delay.
[ 13.169571] rk_gmac-dwmac ff4d0000.ethernet: set tx_delay to 0xffffffff
[ 13.173627] rk_gmac-dwmac ff4d0000.ethernet: Can not read property: rx_delay.
[ 13.177681] rk_gmac-dwmac ff4d0000.ethernet: set rx_delay to 0xffffffff
[ 13.181919] rk_gmac-dwmac ff4d0000.ethernet: integrated PHY? (no).
[ 13.181954] rk_gmac-dwmac ff4d0000.ethernet: cannot get clock mac_clk_rx
[ 13.186021] rk_gmac-dwmac ff4d0000.ethernet: cannot get clock mac_clk_tx
[ 13.189998] rk_gmac-dwmac ff4d0000.not get clock clk_mac_ref
[ 13.193876] rk_gmac-dwmac ff4d0000ernet: cannot get clock clk_mac_refout
[ 13.197711] rk_gmac-dmethernet: cannot get clock clk_mac_speed
[ 13.1980000.ethernet: init for RMII
[ 13.231306] rk_g1;31methernet: User ID: 0x40, Synopsys ID: 0x51
[ 13c ff4d0000.ethernet: DWMAC4/5
[ 13.231357] [01;31methernet: DMA HW capability register supported
-dwmac ff4d0000.ethernet: RX Checksum Offload E13.231376] rk_gmac-dwmac ff4d0000.ethernet: TX pported
[ 13.231385] rk_gmac-dwmac ff4d0000.ethLan supported
[ 13.231532] rk_gmac-dwmac ff4d0000.pported
[ 13.231555] rk_gmac-dwmac ff4d0000.ethtigation via HW Watchdog Timer
[ 13.231571] rk_gmac-dwmac ff4[mernet: Enabled RFS Flow TC (entries=10)
[ 13.231585] rk_ethernet: TSO feature enabled
[ 13.231595] rethernet: Using 40/40 bits DMA host/device widtng random self ethernet address
[ 18.192171];31methernet address
[ 19.905358] rk_gmac-dwmac ff4dmernet eth0: Register MEM_TYPE_PAGE_POOL RxQmac-dwmac ff4d0000.ethernet ethver [Generic PHY] (irq=POLL)
[ 19.907109] rk_gmac-dwmac ff4dmernet eth0: No Safety Features support founac-dwmac ff4d0000.ethernet ethced Timestamp supported
[ 19.907482] rk_gmac-dwmac ff4d0000. eth0: registered PTP clock
[ 19.925424] rk[01;31methernet eth0: configuring for 21.948021] rk_gmac-dwmac ff4d0000.ethernet nk is Up - 100Mbps/Full - flow control rx/tx

Any help is appreciated.

Thank you.

Hello, from the log, the Ethernet device has completed the registration prompt "ff4d0000.ethernet nk is Up" means that the network cable has been connected, is the network port lights off after a few seconds of start-up or the kernel prompts "ff4d0000.ethernet nk is Down"?

I have solved it was a power problem.

Thank you for your support.