Cannot reproduce
root@build:~# dmesg|grep 'rk_gmac\|model'
[ 3.044416] Machine model: Orange Pi 5
[ 5.539395] rk_gmac-dwmac fe1c0000.ethernet: IRQ eth_lpi not found
[ 5.539572] rk_gmac-dwmac fe1c0000.ethernet: Looking up phy-supply from device tree
[ 5.539584] rk_gmac-dwmac fe1c0000.ethernet: Looking up phy-supply property in node /ethernet@fe1c0000 failed
[ 5.539604] rk_gmac-dwmac fe1c0000.ethernet: supply phy not found, using dummy regulator
[ 5.539686] rk_gmac-dwmac fe1c0000.ethernet: clock input or output? (output).
[ 5.539702] rk_gmac-dwmac fe1c0000.ethernet: TX delay(0x42).
[ 5.539715] rk_gmac-dwmac fe1c0000.ethernet: Can not read property: rx_delay.
[ 5.539727] rk_gmac-dwmac fe1c0000.ethernet: set rx_delay to 0xffffffff
[ 5.539745] rk_gmac-dwmac fe1c0000.ethernet: integrated PHY? (no).
[ 5.539760] rk_gmac-dwmac fe1c0000.ethernet: cannot get clock mac_clk_rx
[ 5.539774] rk_gmac-dwmac fe1c0000.ethernet: cannot get clock mac_clk_tx
[ 5.539796] rk_gmac-dwmac fe1c0000.ethernet: cannot get clock clk_mac_speed
[ 5.540029] rk_gmac-dwmac fe1c0000.ethernet: init for RGMII_RXID
[ 5.540156] rk_gmac-dwmac fe1c0000.ethernet: User ID: 0x30, Synopsys ID: 0x51
[ 5.540176] rk_gmac-dwmac fe1c0000.ethernet: DWMAC4/5
[ 5.540189] rk_gmac-dwmac fe1c0000.ethernet: DMA HW capability register supported
[ 5.540202] rk_gmac-dwmac fe1c0000.ethernet: RX Checksum Offload Engine supported
[ 5.540215] rk_gmac-dwmac fe1c0000.ethernet: TX Checksum insertion supported
[ 5.540227] rk_gmac-dwmac fe1c0000.ethernet: Wake-Up On Lan supported
[ 5.540271] rk_gmac-dwmac fe1c0000.ethernet: TSO supported
[ 5.540283] rk_gmac-dwmac fe1c0000.ethernet: Enable RX Mitigation via HW Watchdog Timer
[ 5.540297] rk_gmac-dwmac fe1c0000.ethernet: Enabled L3L4 Flow TC (entries=2)
[ 5.540310] rk_gmac-dwmac fe1c0000.ethernet: Enabled RFS Flow TC (entries=10)
[ 5.540323] rk_gmac-dwmac fe1c0000.ethernet: TSO feature enabled
[ 5.540335] rk_gmac-dwmac fe1c0000.ethernet: Using 32/32 bits DMA host/device width
[ 12.372333] rk_gmac-dwmac fe1c0000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
[ 12.376013] rk_gmac-dwmac fe1c0000.ethernet eth0: PHY [stmmac-1:01] driver [YT8531 Gigabit Ethernet] (irq=POLL)
[ 12.376537] rk_gmac-dwmac fe1c0000.ethernet eth0: No Safety Features support found
[ 12.376546] rk_gmac-dwmac fe1c0000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 12.376657] rk_gmac-dwmac fe1c0000.ethernet eth0: registered PTP clock
[ 12.376832] rk_gmac-dwmac fe1c0000.ethernet eth0: FPE workqueue start
[ 12.376837] rk_gmac-dwmac fe1c0000.ethernet eth0: configuring for phy/rgmii-rxid link mode
[ 16.441134] rk_gmac-dwmac fe1c0000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 496.767911] rk_gmac-dwmac fe1c0000.ethernet eth0: Link is Down
[13273.107988] rk_gmac-dwmac fe1c0000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
root@build:~# uname -a
Linux build 6.1.115-vendor-rk35xx #1 SMP Tue Apr 15 18:23:00 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux