NFS Root with Raspberry Pi (nfs_diskless: no interface)

[Randy Westlund]

I'm trying to boot a Raspberry Pi over the network so I can avoid SD
card woes, but I'm stuck on something.

I've taken the FreeBSD RPI-B image and moved the files to an NFS share
on a server.  Its fstab references the NFS root, but all other files are
unchanged.

Thus far, I have the pi loading U-Boot from the SD card and grabbing
ubldr via TFTP.  Then ubldr successfully connects to the NFS share and
loads the kernel.

My problem is when the kernel tries to mount root.  I'm getting this
error:

> usbus0: 480Mbps High Speed USB v2.0
> bcm2835_cpufreq0: ARM 700MHz, Core 250MHz, SDRAM 400MHz, Turbo OFF
> ugen0.1: <DWCOTG> at usbus0
> uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
> mmcsd0: 4GB <SDHC SU04G 8.0 SN 001FC92A MFG 12/2011 by 3 SD> at mmc0 41.6MHz/4bit/65535-block
> nfs_diskless: no interface
> Root mount waiting for: usbus0
> uhub0: 1 port with 1 removable, self powered
> ugen0.2: <vendor 0x0424> at usbus0
> uhub1: <vendor 0x0424 product 0x9512, class 9/0, rev 2.00/2.00, addr 2> on usbus0
> uhub1: MTT enabled
> Root mount waiting for: usbus0
> uhub1: 3 ports with 2 removable, self powered
> Root mount waiting for: usbus0
> ugen0.3: <vendor 0x0424> at usbus0
> smsc0: <vendor 0x0424 product 0xec00, rev 2.00/2.00, addr 3> on usbus0
> Trying to mount root from nfs:192.168.1.254:/usr/raspi_root [rw]...
> nfs_diskless: no interface
> Mounting from nfs:192.168.1.254:/usr/raspi_root failed with error -1.
>

I believe "nfs_diskless: no interface" is the important part.  The
ethernet port is not ready by the time it tries to mount root.

The pi uses ethernet over USB and FreeBSD calls the interface ue0.  When
I boot from the SD card, ethernet works without loading any modules, so
I believe the kernel should have everything it needs.

What am I doing wrong?

Randy
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