Hi,

I am trying to setup NFS boot on my ATSAm9G45 board but not able to get the exact configuraiton. The default setting in the uboot was as follows

console=ttySAC0,115200 tft=m root=/dev/mtdblock6 mtdparts=atmel_nand:128k(bootstrap)ro,256k (uboot)ro,128k(env1)ro,128k(env2)ro,1M(logo)ro,2M(linux),-(root) rw rootfstype=yaffs2

My nfs is located at the following location on my server
/home/workspace/Debug_box/Atmel_ARM_Board/dbgene_fw/source_code/dbgene_fs

When i try to append the above path in uboot, my tera term doesn't allow me to input such a big string, not sure what is the problem....

Then i tried to trim the configuration as below
bootargs=console=ttySAC0,115200 tft=m root=/dev/mtdblock6 nfsroot=10.223.129.90:/home/workspace/Debu
g_box/Atmel_ARM_Board/dbgene_fw/source_code/dbgene_fs rw rootfstype=yaffs2 mem=128M

When i do bootm, it boots but loads the file system from my NAND flash then NFS.
Can anyone please help me on this?

-Prashanth

Hi Prashanth,

I think you have specified the wrong root device. My settings for booting through nfs is the following:

setenv bootargs=mem=64M root=/dev/nfs rw init=/sbin/init console=ttyS0,115200 nfsroot=192.168.0.2:/home/devolution/angstrom/ ip=192.168.0.3

Notice the "root=/dev/nfs" part.

Best regards
Erik Sandbraaten

Thanks for the reply. Will give it a try and let u know

I have some problem to mount the root filesystem by nfs. The kernel is loaded by tftp
The kernel is built with openembedded, I tried also with the pre-build image with the same result.
Any suggestions is appreciated.
Thanks
J

Linux version 2.6.30 (gcc version 4.3.3 (GCC) ) #1 Sun Feb 20 01:27:20 CET 2011
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Atmel AT91SAM9M10-EKES
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: root=/dev/nfs rw nfsroot=192.168.3.105:/nfs/rootfs_at91 ip=192.168.3.200 mem=64M rootfstype=ext3
NR_IRQS:192
AT91: 160 gpio irqs in 5 banks
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x30
console [tty0] enabled
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: 61012KB available (3392K code, 237K data, 116K init, 0K highmem)
Calibrating delay loop... 199.47 BogoMIPS (lpj=997376)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
net_namespace: 296 bytes
NET: Registered protocol family 16
atmel_tcb: probe of atmel_tcb.0 failed with error -22
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
cfg80211: Calling CRDA to update world regulatory domain
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
JFFS2 version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
msgmni has been set to 119
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
io scheduler noop registered
io scheduler anticipatory registered (default)
atmel_lcdfb atmel_lcdfb.0: 255KiB frame buffer at 73900000 (mapped at ffa00000)
atmel_lcdfb atmel_lcdfb.0: fb0: Atmel LCDC at 0x00500000 (mapped at c4858000), irq 23
atmel_usart.0: ttyS0 at MMIO 0xfeffee00 (irq = 1) is a ATMEL_SERIAL
atmel_usart.2: ttyS2 at MMIO 0xfff90000 (irq = 8) is a ATMEL_SERIAL
brd: module loaded
loop: module loaded
Driver 'sd' needs updating - please use bus_type methods
MACB_mii_bus: probed
eth0: Atmel MACB at 0xfffbc000 irq 25 (3e:36:65:ba:6f:be)
eth0: attached PHY driver [Davicom DM9161A] (mii_bus:phy_addr=ffffffff:00, irq=-1)
No NAND device found!!!
atmel_spi atmel_spi.0: Atmel SPI Controller at 0xfffa4000 (irq 14)
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
atmel-ehci atmel-ehci: Atmel EHCI UHP HS
atmel-ehci atmel-ehci: new USB bus registered, assigned bus number 1
atmel-ehci atmel-ehci: irq 22, io mem 0x00800000
atmel-ehci atmel-ehci: USB 2.0 started, EHCI 1.00
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: Atmel EHCI UHP HS
usb usb1: Manufacturer: Linux 2.6.30 ehci_hcd
usb usb1: SerialNumber: atmel-ehci
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 2
at91_ohci at91_ohci: irq 22, io mem 0x00700000
usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: AT91 OHCI
usb usb2: Manufacturer: Linux 2.6.30 ohci_hcd
usb usb2: SerialNumber: at91
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
atmel_usba_udc atmel_usba_udc: MMIO registers at 0xfff78000 mapped at c485c000
atmel_usba_udc atmel_usba_udc: FIFO at 0x00600000 mapped at c4900000
mice: PS/2 mouse device common for all mice
input: gpio-keys as /devices/platform/gpio-keys/input/input0
atmel_tsadcc atmel_tsadcc: Master clock is set at: 133333333 Hz
atmel_tsadcc atmel_tsadcc: Prescaler is set at: 221
input: atmel touch screen controller as /devices/platform/atmel_tsadcc/input/input1
rtc-at91sam9 at91_rtt.0: rtc core: registered at91_rtt as rtc0
IRQ 1/rtc0: IRQF_DISABLED is not guaranteed on shared IRQs
rtc-at91sam9 at91_rtt.0: rtc0: SET TIME!
i2c-gpio i2c-gpio.0: using pins 52 (SDA) and 53 (SCL)
Registered led device: d8
Registered led device: d6
Registered led device: d7
at_hdmac at_hdmac: Atmel AHB DMA Controller ( cpy slave ), 8 channels
Advanced Linux Sound Architecture Driver Version 1.0.20.
atmel_ac97c atmel_ac97c.0: Atmel AC97 controller at 0xc4880000, irq = 24
ALSA device list:
#0: Atmel AC97 controller
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
lib80211: common routines for IEEE802.11 drivers
rtc-at91sam9 at91_rtt.0: hctosys: unable to read the hardware clock
atmel_mci atmel_mci.0: Using dma0chan0 for DMA transfers
atmel_mci atmel_mci.0: Atmel MCI controller at 0xfff80000 irq 11, 1 slots
atmel_mci atmel_mci.1: Using dma0chan1 for DMA transfers
atmel_mci atmel_mci.1: Atmel MCI controller at 0xfffd0000 irq 29, 1 slots
VFS: Cannot open root device "nfs" or unknown-block(0,255)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)
[<c002a344>] (unwind_backtrace+0x0/0xdc) from [<c02b17ec>] (panic+0x34/0x110)
[<c02b17ec>] (panic+0x34/0x110) from [<c0008e90>] (mount_block_root+0x25c/0x2b4)
[<c0008e90>] (mount_block_root+0x25c/0x2b4) from [<c00090b8>] (prepare_namespace+0x164/0x1c8)
[<c00090b8>] (prepare_namespace+0x164/0x1c8) from [<c0008404>] (kernel_init+0xb8/0xe8)
[<c0008404>] (kernel_init+0xb8/0xe8) from [<c00377c4>] (do_exit+0x0/0x5a4)
[<c00377c4>] (do_exit+0x0/0x5a4) from [<00000003>] (0x3)

[quote="jaws"]I have some problem to mount the root filesystem by nfs. The kernel is loaded by tftp
The kernel is built with openembedded, I tried also with the pre-build image with the same result.
Any suggestions is appreciated.
Thanks
J

Kernel command line: root=/dev/nfs rw nfsroot=192.168.3.105:/nfs/rootfs_at91 ip=192.168.3.200 mem=64M rootfstype=ext3
[/quote]

In Kernel something like this:
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
CONFIG_ROOT_NFS=y
CONFIG_NFS_COMMON=y

[quote="jaws"]
rootfstype=ext3
[/quote]
A u sure that kernel will work with this argument? I have something like this:

console=ttyS0,115200 mem=64M root=/dev/nfs nfsroot=192.168.1.2:/home/Developer/rootfs ip=192.168.1.3:192.168.1.2:192.168.1.1:255.255.255.0::eth0:off\0