Hi Fabio,
Fabio Estevam wrote:
> I am using uClinux-dist-20060803 and I can do NFS
> mount on the M5208EVB.
>
> Now I would like to do a NFS root file system mount.
>
> My question is: how to enable NFS root file system
> support?
>
> I am using dBug as bootloader and I am not sure if it
> can pass boot arguments to uClinux.
Here's some instructions I've used for NFS mounting a root
filesystem on a M5208EVB. Hope this helps. (Make sure
you disable the CONFIG_ROMFS_FS option in the kernel.)
Regards,
Matt
---+ NFS deployment example
In this example we assume the following parameters:
Host system's IP address: 192.168.0.9
Target board's IP address: 192.168.0.254
---++ setup your host and target IP addresses
Change the bootloader parameters (this is persistent and so needs to
only be done once):
dBUG> set client 192.168.0.254
dBUG> set server 192.168.0.9
---++ Configure the target IP and Kernel command line
Next, you need to set the kernel command line for NFS deployment.
If you have a newer bootloader, you can use the 'set kcl' command.
If not, you're going to have to configure this into the kernel you build
---+++ Newer dBUG bootloaders that support 'set kcl'
dBUG> set kcl "console=ttyS0,115200 root=/dev/nfs rw ip=192.168.0.254:192.168.0.
9:::::"
---+++ Older dBUG bootloaders that don't support 'set kcl'
Configure the kernel
Kernel hacking --->
[*] Compiled-in Kernel Boot Parameter
Kernel Boot Parameter: "console=ttyS0,115200 root=/dev/nfs rw ip=192.168.0.254:
192.168.0.9:::::"
Build kernel
---++ Copy the kernel to the /tftpboot area
$ cp rootfs/boot/vmlinux.bin /tftpboot
---++ Setup the NFS server area
As root make a symlink to your root filesystem area:
# cd /tftpboot
# ln -s /home/uClinux-dist/romfs 192.168.0.254
As root, edit /etc/exports and enter into this:
/tftpboot/192.168.0.254 192.168.0.254(rw,no_root_squash,sync)
re-export the NFS area:
# /usr/sbin/exportfs -rv
Note: make sure your NFS server is running.
And: make sure your firewall (iptables) is not blocking 192.168.0.254
---++ Download the built kernel
dBUG> dn vmlinux.bin
Address: 0x40020000
Downloading Image 'vmlinux.bin' from 192.168.0.9
TFTP transfer completed
Read 1519616 bytes (2969 blocks)
---++ Boot the kernel
dBUG> go 0x40020000
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