Dreamplug, BOOTP, NFS root, DHCP

Wed Mar 27 02:29:15 UTC 2013

On Tue, 2013-03-26 at 19:11 +0100, Mattia Rossi wrote:
> Hi all,
> 
> I'm currently trying to set up my Dreamplug again, which should be quite
> easy thanks to the neat work don by Ian.
> 
> I've just made a mistake when uploading the new world to the dreamplug and
> unpacking it, so I've trashed my world on the Dreamplug's internal SD card.
> 
> The logical workaround would be to mount the new world via NFS, then copy
> it onto the SD and voila, problem solved.
> 
> Not the case though.
> First I've tried to mount the NFS root without enabling BOOTP, as the root
> path is already set in ROOTDEVNAME. No luck, but you of course know that,
> as Lars (Eggert) had the same issues not too long ago, and Ian filed a bug
> for it. Quick question: what's the progress there?
> 
> So, next step was to enable BOOTP and all the necessary options in the
> kernel, and to set up a DHCP server. Should be easy and straigthforward,
> but here comes the interesting part:
> I already have a DHCP server in the crappy modem I've got. I've decided to
> ignore that, and just set up a second range for the DHCP server on the
> FreeBSD machine, which distributes the root-path with it. With the two DHCP
> servers on the network, I get a kernel panic:
> 
> <snip>
> bootpc_init: wired to interface 'mge0'
> Sending DHCP Discover packet from interface mge0 (f0:ad:4e:00:84:c7)
> uhub0: 1 port with 1 removable, self powered
> mge0: link state changed to UP
> Received DHCP Offer packet on mge0 from 192.168.0.1 (accepted) (no root
> path)
> ugen0.2: <vendor 0x1a40> at usbus0
> uhub1: <vendor 0x1a40 USB 2.0 Hub, class 9/0, rev 2.00/1.11, addr 2> on
> usbus0
> Received DHCP Offer packet on mge0 from 192.168.0.1 (accepted) (no root
> path)
> uhub1: 4 ports with 4 removable, self powered
> ugen0.3: <vendor 0x05e3> at usbus0
> umass0: <vendor 0x05e3 USB Storage, class 0/0, rev 2.00/99.10, addr 3> on
> usbus0
> da0 at umass-sim0 bus 0 scbus2 target 0 lun 0
> da0: <Generic STORAGE DEVICE 9910> Removable Direct Access SCSI-0 device
> da0: 40.000MB/s transfers
> da0: 1876MB (3842048 512 byte sectors: 255H 63S/T 239C)
> da1 at umass-sim0 bus 0 scbus2 target 0 lun 1
> da1: <Generic STORAGE DEVICE 9910> Removable Direct Access SCSI-0 device
> da1: 40.000MB/s transfers
> da1: 974MB (1995264 512 byte sectors: 64H 32S/T 974C)
> Sending DHCP Request packet from interface mge0 (f0:ad:4e:00:84:c7)
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (got root path)
> ugen0.4: <vendor 0x0d8c> at usbus0
> uaudio0: <vendor 0x0d8c C-Media USB Headphone Set, class 0/0, rev
> 1.10/1.00, ad0
> uaudio0: Play: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: No MIDI sequencer.
> pcm0: <USB audio> on uaudio0
> uaudio0: HID volume keys found.
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> mge0 at 192.168.0.21 server 192.168.0.1
> subnet mask 255.255.255.0 router 192.168.0.1
> Adjusted interface mge0
> panic: nfs_boot: mountd root, error=47
> KDB: enter: panic
> [ thread pid 0 tid 100000 ]
> Stopped at      kdb_enter+0x48: ldrb    r15, [r15, r15, ror r15]!
> db>
> 
> With just the DHCP server on the modem:
> 
> <snip>
> bootpc_init: wired to interface 'mge0'
> Sending DHCP Discover packet from interface mge0 (f0:ad:4e:00:84:c7)
> uhub0: 1 port with 1 removable, self powered
> mge0: link state changed to UP
> Received DHCP Offer packet on mge0 from 192.168.0.1 (accepted) (no root
> path)
> ugen0.2: <vendor 0x1a40> at usbus0
> uhub1: <vendor 0x1a40 USB 2.0 Hub, class 9/0, rev 2.00/1.11, addr 2> on
> usbus0
> uhub1: 4 ports with 4 removable, self powered
> Sending DHCP Request packet from interface mge0 (f0:ad:4e:00:84:c7)
> ugen0.3: <vendor 0x05e3> at usbus0
> umass0: <vendor 0x05e3 USB Storage, class 0/0, rev 2.00/99.10, addr 3> on
> usbus0
> da0 at umass-sim0 bus 0 scbus2 target 0 lun 0
> da0: <Generic STORAGE DEVICE 9910> Removable Direct Access SCSI-0 device
> da0: 40.000MB/s transfers
> da0: 1876MB (3842048 512 byte sectors: 255H 63S/T 239C)
> da1 at umass-sim0 bus 0 scbus2 target 0 lun 1
> da1: <Generic STORAGE DEVICE 9910> Removable Direct Access SCSI-0 device
> da1: 40.000MB/s transfers
> da1: 974MB (1995264 512 byte sectors: 64H 32S/T 974C)
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> ugen0.4: <vendor 0x0d8c> at usbus0
> uaudio0: <vendor 0x0d8c C-Media USB Headphone Set, class 0/0, rev
> 1.10/1.00, ad0
> uaudio0: Play: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: Record: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
> uaudio0: No MIDI sequencer.
> pcm0: <USB audio> on uaudio0
> uaudio0: HID volume keys found.
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> Received DHCP Ack packet on mge0 from 192.168.0.1 (accepted) (no root path)
> DHCP/BOOTP timeout for server 255.255.255.255
> <and so on>
> 
> no panic, just waiting for a root path.
> 
> Help?
> Can't turn off the DHCP on the modem, as I have limited rights, and it's
> crap.
> 
> Mat

I've only got a few minutes available right now, so not much to offer,
except... could you put a world on a usb thumb drive and recompile the
kernel for a /dev/daNxx root path?  Even better would be a world on an
eSata drive if you have one.  (One of those multi-slot docks that holds
a couple drives and is both a usb dock and an eSata port multiplier, is
a nifty thing for a dreamplug owner to have.)

-- Ian