eth0无法识别到连接，网口的灯也没有亮，但在更换核心板后可以正常使用。
在重新烧录核心板后依然无法使用，是否有方式修复？
以下是相关状态：
nmcli device status:
DEVICE TYPE STATE CONNECTION
wlan0 wifi connected esp-01s
p2p-dev-wlan0 wifi-p2p disconnected –
eth0 ethernet unavailable –
l4tbr0 bridge unmanaged –
can0 can unmanaged –
usb0 ethernet unmanaged –
usb1 ethernet unmanaged –
lo loopback unmanaged –
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sudo ip link show eth0:
7: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether 3c:6d:66:11:84:5f brd ff:ff:ff:ff:ff:ff
altname enP8p1s0
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sudo ethtool eth0:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: Unknown!
Duplex: Unknown! (255)
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: no