Diagnostic

# dmesg
bus: 'mdio_bus': registered
bus: 'mdio_bus': add driver Generic PHY
bus: 'platform': add driver macb
bus: 'platform': driver_probe_device: matched device macb with driver macb
bus: 'platform': really_probe: probing driver macb with device macb
device: 'eth0': device_add
device: 'ffffffff': device_add
device: 'ffffffff:00': device_add
bus: 'mdio_bus': add device ffffffff:00
device: 'ffffffff:04': device_add
bus: 'mdio_bus': add device ffffffff:04
MACB_mii_bus: probed
driver: 'ffffffff:00': driver_bound: bound to device 'Generic PHY'
eth0: Atmel MACB at 0xfffc4000 irq 21 (12:34:56:78:9a:bc)
eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=ffffffff:00, irq=-1)
driver: 'macb': driver_bound: bound to device 'macb'
bus: 'platform': really_probe: bound device macb to driver macb


# mii-diag
Using the default interface 'eth0'.
Basic registers of MII PHY #0:  3000 7849 0022 1513 01e1 ffff 0004 2001.
The autonegotiated capability is 01e0.
The autonegotiated media type is 100baseTx-FD.
Basic mode control register 0x3000: Auto-negotiation enabled.
Basic mode status register 0x7849 ... 7849.
Link status: not established.
Your link partner advertised ffff: Flow-control 100baseT4 100baseTx-FD 100baseTx 10baseT-FD 10baseT, w/ 802.3X flow control.
End of basic transceiver information.

# ethtool
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half
        Supported pause frame use: No
        Supports auto-negotiation: No
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Link detected: no

# cat /proc/interrupts
           CPU0
  1:    1602016         AIC  at91_tick, ttyS0
  9:      10422         AIC  mmc0
 20:          0         AIC  ohci_hcd:usb1
 21:          0         AIC  eth0
Err:          0

# lsmod
Module                  Size  Used by
macb                    6876  0
libphy                 14442  1 macb