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i am trying to mount rootfs on board using NFS

my NFS export file 

/home/user/demo/rootfs  192.168.0.200(rw,sync,no_root_squash,no_subtree_check)

my kernel arguments are

bootargs=console=ttyS0,115200 root=/dev/nfs rootfstype=nfs ip=192.168.0.102 rw nfsroot=192.168.0.200:/home/user/demo/rootfs,4.1

when i boot my board it shows following error

IP-Config: Complete:
     device=eth0, hwaddr=54:10:ec:a9:81:79, ipaddr=192.168.0.100, mask=255.255.255.0, gw=255.255.255.255
     host=192.168.0.100, domain=, nis-domain=(none)
     bootserver=255.255.255.255, rootserver=192.168.0.100, rootpath=
ALSA device list:
  No soundcards found.
atmel_usart_serial atmel_usart_serial.0.auto: using dma0chan5 for rx DMA transfers
atmel_usart_serial atmel_usart_serial.0.auto: using dma0chan6 for tx DMA transfers
VFS: Unable to mount root fs via NFS

i dont know whats is wrong but i am not able mount rootfs,anyone have any idea how to fix it.

Ganesh Khose
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    Enable more debugging via kernel command line and, possible, kernel configuration. At least be sure you have `ignore_loglevel initcall_debug` set. Besides that it's good to have early console enabled (see documentation for `earlycon` kernel command line parameter). – 0andriy Feb 28 '20 at 15:31
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    Your description is sparse and incomplete. Has the kernel been configured/built with the salient requisite capabilities? Have you tested that the target NFS filesystem is mountable? Your kernel log seems edited and has insufficient content. The field in the `nfsroot=` parameter in the kernel command line looks suspicious. The `ip=` parameter in the kernel command line is incomplete, i.e. the ("*required* for NFS root") field is missing from this parameter. Study **Documentation/filesystems/nfs/nfsroot.txt** – sawdust Feb 29 '20 at 01:21
  • Ok i will study.and I have tested nfs server using Windows nfs client i am able to access file on my windows system . – Ganesh Khose Feb 29 '20 at 02:59
  • According to your log you configured the device IP 192.168.0.100, the same as the server address. Fix that and retry. – Luca Ceresoli Mar 02 '20 at 07:44
  • @LucaCeresoli i ahve change it but can you suggest me proper bootargs to set – Ganesh Khose Mar 02 '20 at 11:31

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