boot via nfs

Hi,

I am trying to boot a 9g20 to use a root file system from my server with NFS.
I have a root file system that works great with a 9302 which uses RedBoot with the following commands:
fis load zImage
exec -c "root=/dev/nfs nfsroot=192.168.1.70:/home/dan/9302 ip=dhcp console=ttyAM0"

So Im trying to boot the 9g20 from the same NFS share (this may not be possible?)
so in U-Boot I am using:
set bootargs 'console=ttyS0,115200 root=/dev/nfs rw nfsroot=192.168.1.70:/home/dan/9302,nolock'
set ip 192.168.1.5:192.168.1.70:192.168.1.1:255.255.255.0:f175::off
boot

and I get:

ÿRomBOOT

U-Boot 1.3.4 (Jul 24 2009 - 17:50:12)

DRAM: 64 MB
NAND: 256 MiB
In: serial
Out: serial
Err: serial
Net: macb0
macb0: Starting autonegotiation...
macb0: Autonegotiation complete
macb0: link up, 100Mbps full-duplex (lpa: 0x4de1)
Hit any key to stop autoboot: 0
U-Boot> <INTERRUPT>
U-Boot> set bootargs 'console=ttyS0,115200 root=/dev/nfs rw nfsroot=192.168.1.70:/home/dan/9302,nolock'
U-Boot> set ip 192.168.1.5:192.168.1.70:192.168.1.1:255.255.255.0:f175::off
U-Boot> boot

NAND read: device 0 offset 0x100000, size 0x1a7a38
1735224 bytes read: OK
## Booting kernel from Legacy Image at 21000000 ...
Image Name: Linux-2.6.27.4
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1735160 Bytes = 1.7 MB
Load Address: 20008000
Entry Point: 20008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.27.4 (user1@Atlas) (gcc version 4.2.3) #4 Sat Jun 27 16:17:54 EDT 2009
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
Machine: Atmel AT91SAM9G20-EK
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 396 MHz, master 132 MHz, main 18.432 MHz
CPU0: D VIVT write-back cache
CPU0: I cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets
CPU0: D cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: console=ttyS0,115200 root=/dev/nfs rw nfsroot=192.168.1.70:/home/dan/9302,nolock
AT91: 96 gpio irqs in 3 banks
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x30
console [ttyS0] enabled
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 61248KB available (3228K code, 250K data, 132K init)
Calibrating delay loop... 197.83 BogoMIPS (lpj=989184)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
net_namespace: 288 bytes
NET: Registered protocol family 16
AT91: Power Management
AT91: Starting after general reset
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NET: Registered protocol family 1
NetWinder Floating Point Emulator V0.97 (double precision)
JFFS2 version 2.2. (NAND) (SUMMARY) Â© 2001-2006 Red Hat, Inc.
msgmni has been set to 119
io scheduler noop registered
io scheduler anticipatory registered (default)
atmel_usart.0: ttyS0 at MMIO 0xfefff200 (irq = 1) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xfffb0000 (irq = 6) is a ATMEL_SERIAL
atmel_usart.2: ttyS2 at MMIO 0xfffb4000 (irq = 7) is a ATMEL_SERIAL
brd: module loaded
loop: module loaded
ssc ssc.0: Atmel SSC device at 0xc4870000 (irq 14)
MACB_mii_bus: probed
eth0: Atmel MACB at 0xfffc4000 irq 21 (3a:1f:34:08:54:54)
eth0: attached PHY driver [Davicom DM9161A] (mii_bus:phy_addr=ffffffff:00, irq=-1)
Linux video capture interface: v2.00
Driver 'sd' needs updating - please use bus_type methods
NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit)
AT91 NAND: 8-bit, Software ECC
Scanning device for bad blocks
Bad eraseblock 118 at 0x00ec0000
Creating 3 MTD partitions on "atmel_nand":
0x00000000-0x00400000 : "Bootstrap"
0x00400000-0x04000000 : "Partition 1"
0x04000000-0x10000000 : "Partition 2"
usbmon: debugfs is not available
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
at91_ohci at91_ohci: irq 20, io mem 0x00500000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
usbcore: registered new interface driver usblp
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
udc: at91_udc version 3 May 2006
g_ether gadget: using random self ethernet address
g_ether gadget: using random host ethernet address
usb0: MAC 62:86:dc:30:cc:1d
usb0: HOST MAC 7e:3e:e9:cd:8f:2e
g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
g_ether gadget: g_ether ready
mice: PS/2 mouse device common for all mice
input: gpio-keys as /class/input/input0
rtc-at91sam9 at91_rtt.0: rtc core: registered at91_rtt as rtc0
rtc-at91sam9 at91_rtt.0: rtc0: SET TIME!
i2c /dev entries driver
i2c-gpio i2c-gpio: using pins 55 (SDA) and 56 (SCL)
Driver for 1-wire Dallas network protocol.
at91sam9_wdt: invalid timeout (must be between 1 and 16)
Registered led device: ds5
Registered led device: ds1
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
rtc-at91sam9 at91_rtt.0: hctosys: unable to read the hardware clock
Looking up port of RPC 100003/2 on 192.168.1.70 <<--Long pause here
rpcbind: server 192.168.1.70 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.70
rpcbind: server 192.168.1.70 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /home/dan/9302
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00 4096 mtdblock0 (driver?)
1f01 61440 mtdblock1 (driver?)
1f02 196608 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

Any ideas? thanks for any help.

p.s I my final target is really a 9260S but it has no ethernet so I am assuming the 9g20 I have with ethernet will be the same (re ADC and GPIO)??