secondary CPU port facing switch does not come up/online

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{"kernel":"5.4.46","hostname":"OpenWrt","system":"ARMv7 Processor rev 1 (v7l)","model":"Turris Omnia","board_name":"cznic,turris-omnia","release":{"distribution":"OpenWrt","version":"SNAPSHOT","revision":"r13600-9a477b833a","target":"mvebu/cortexa9","description":"OpenWrt SNAPSHOT r13600-9a477b833a"}}

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mvneta f1070000.ethernet eth0: Using hardware mac address





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DT

cpu_port5: ports@5 {
    reg = <5>;
    label = "cpu";
    ethernet = <&eth1>;

    fixed-link {
        speed = <1000>;
        full-duplex;
    };
};

cpu_port6: ports@6 {
    reg = <6>;
    label = "cpu";
    ethernet = <&eth0>;

    fixed-link {
        speed = <1000>;
        full-duplex;
    };
};
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kconf

CONFIG_MTD_NAND_MARVELL=y
# CONFIG_PATA_MARVELL is not set
CONFIG_NET_VENDOR_MARVELL=y
CONFIG_MARVELL_PHY=y
# CONFIG_MARVELL_10G_PHY is not set
# CONFIG_WLAN_VENDOR_MARVELL is not set
CONFIG_CRYPTO_DEV_MARVELL_CESA=y

With the below cited DT both CPU ports facing the node's build-in switch are brought online at boot time with kernel 4.14 but since having switched to kernel 5.4 only one CPU port gets online. It is as if the kernel discards the presence of the secondary CPU port. Kernel log only prints for the offline port just a single entry: Swapping eth1 to port6 and eth0 to port6 then eth0 is brought online but eth1 is not. Removing port5 then the port6 listed port is brought up/online. Once the node is booted the offline port can brought up with ip l set up. This seems like a regression bug in between the kernel versions.

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