[Bug 264179] em(4): 13.1-RELEASE hangs on boot at 82574L (em0, 0x10d3) with I219-V (em1, 0x1a1d ) enabled (Intel Alderlake GbE NIC)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264179

--- Comment #17 from Yasuhiro Kimura <yasu@freebsd.org> ---
(In reply to Xin LI from comment #16)

Yesterday I found newer version of BIOS for the motherboard in question is
released. I updated the BIOS of my home server to the latest one and after that
onboard NIC is successfully detected as following.

yasu@eastasia[1008]% ifconfig -a
em0: flags=8822<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=481249b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,WOL_MAGIC,VLAN_HWFILTER,NOMAP>
        ether xx:xx:xx:xx:xx:xx
        media: Ethernet autoselect
        status: no carrier
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
em1: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=481049b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,VLAN_HWFILTER,NOMAP>
        ether xx:xx:xx:xx:xx:xx
        inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
        inet6 fe80::xxxx:xxxx:xxxx:xxxx%em1 prefixlen 64 scopeid 0x2
        inet6 xxxx:xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx prefixlen 64
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet 127.0.0.1 netmask 0xff000000
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
yasu@eastasia[1008]% 

Onboard NIC is detected as em1 and the one inserted to PCIe slot is em0. So the
source of the problem seems to be hardware (or firmware).

I changed /etc/rc.conf so em1 is used and is watching if em1 works without any
problem. I'll keep watching for a while and close this bug report if no problem
happens.

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