Gimletlet NIC2

This board plugs into the Gimletlet expansion port and uses the KSZ8463FRLI to convert RMII to two RJ45 ethernet jacks.

Bringup guide

Connect the NIC to a Gimletlet
Connect 12V power and SWD as usual
Connect ethernet to the upper jack (J2)
Flash the Gimletlet with a recent Hubris image:

$ cargo xtask flash app/gimletlet/app.toml

With the image running, lights should appear on the ethernet jack
Read back the MAC address (which is randomly assigned):

$ cargo xtask humility app/gimletlet/app.toml -- readvar MAC_ADDRESS
humility: attached via ST-Link V3
MAC_ADDRESS (0x20013640) =  {
    value: [
        0xe,
        0x1d,
        0xdd,
        0xf8,
        0xfb,
        0x69
    ]
}

Convert that MAC address to an IPv6 link-local address, e.g. using this tool
Ping the device using ping6 (using your MAC address and replacing en0 with your network interface name)

$ ping6 fe80::c1d:ddff:fef8:fb69%en0
PING6(56=40+8+8 bytes) fe80::18b6:dfe2:7a83:824f%en0 --> fe80::c1d:ddff:fef8:fb69%en0
16 bytes from fe80::c1d:ddff:fef8:fb69%en0, icmp_seq=0 hlim=64 time=3.228 ms
16 bytes from fe80::c1d:ddff:fef8:fb69%en0, icmp_seq=1 hlim=64 time=3.680 ms
16 bytes from fe80::c1d:ddff:fef8:fb69%en0, icmp_seq=2 hlim=64 time=2.010 ms
16 bytes from fe80::c1d:ddff:fef8:fb69%en0, icmp_seq=3 hlim=64 time=2.851 ms
^C
--- fe80::c1d:ddff:fef8:fb69%en0 ping6 statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 2.010/2.942/3.680/0.613 ms

Congratulations! You have a working Gimletlet + NIC.

Testing note

When testing multiple NICs, the Gimletlet does not need to be reflashed, and the MAC / IPv6 address will not change, so you can detach the debugger.

Always remove 12V power from the Gimletlet before swapping the NIC.

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Gimletlet NIC2

Bringup guide

Testing note

2.2 KiB

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