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aen-ethernet-link

Bring up the Alif Ensemble E8 GMAC Ethernet and report net-interface state. BENCH-VERIFIED on E8 — DHCP lease acquired, confirmed server-side (dnsmasq lease + ARP REACHABLE).

Source: examples/aen/aen-ethernet-link/.

What it does​

  1. Powers the PHY and brings up the GMAC (eth_dwmac + the SDK's alif,ethernet glue) over RMII.
  2. Reports net_if state via the Zephyr networking API and waits for a DHCP lease.

The key correctness fact: the GMAC DMA descriptor rings and the net_buf pool must sit in global SRAM0 (chosen zephyr,sram = &sram0, CPU address == DMA address) with CONFIG_DCACHE=n. In the M55 DTCM — the default — they are off the GMAC DMA bus and the link never comes up. A BUILD_ASSERT now rejects the silent cache-incoherent combination. The verified bench clock path is the external 50 MHz RMII oscillator.

board.yaml​

som:
  sku: E1M-AEN801

preset: e1m-evk

cores:
  m55_he:
    app: ./src
    peripherals: [ethernet]

diagnostics:
  log_level: info

Expected output​

[aen-ethernet-link] PHY up, RMII refclk locked
[aen-ethernet-link] DHCP bound: 192.168.10.137

See also​

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