[Buildroot] Enabling NFS

[Buildroot] Enabling NFS

[Steve Calfee]

Hi,

I have just spent some time trying to enable NFS on a beagle board. It seems 
that RPC is required for nfs. 


To enable nfs requires some NFS specific changes to:
find target/device/beagleboard/ | xargs grep  "_NFS"
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_NFS_FS=y
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_NFS_V3=y
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:# CONFIG_NFS_V3_ACL 
is not set
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:# CONFIG_NFS_V4 is 
not set
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_ROOT_NFS=y
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_NFSD=m
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_NFSD_V3=y
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:# CONFIG_NFSD_V3_ACL 
is not set
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_NFS_COMMON=y
target/device/beagleboard/beagleboard-busybox-1.17.x.config:CONFIG_FEATURE_MOUNT_NFS=y

target/device/beagleboard/beagleboard_defconfig:# BR2_PACKAGE_NFS_UTILS is not 
set

To enable RPC requires:
find target/device/beagleboard/ | xargs grep  "_RPC"
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:# CONFIG_ARCH_RPC is 
not set
target/device/beagleboard/beagleboard-linux-2.6.36.1.config:CONFIG_RPCSEC_GSS_KRB5=y

target/device/beagleboard/beagleboard-busybox-1.17.x.config:CONFIG_FEATURE_HAVE_RPC=y

target/device/beagleboard/beagleboard-busybox-1.17.x.config:# 
CONFIG_FEATURE_INETD_RPC is not set
target/device/beagleboard/beagleboard-uClibc-0.9.31.config:UCLIBC_HAS_RPC=y
target/device/beagleboard/beagleboard-uClibc-0.9.31.config:# UCLIBC_HAS_FULL_RPC 
is not set
target/device/beagleboard/beagleboard-uClibc-0.9.31.config:UCLIBC_HAS_REENTRANT_RPC=y

target/device/beagleboard/beagleboard_defconfig:BR2_INET_RPC=y

And here the big issue is the uclibc requires the option to be set, so that 
means a big build!

It seems having to configure buildroot, the kernel, busybox, and uclibc all to 
get this option on is quite an unexpected effort, and I have not even tried with 
uboot yet.

This is what I have found, and I got it working, but I wonder if there was extra 
stuff I did that I did not need to do?

Thanks, Steve



      

[Buildroot] Enabling NFS

[Peter Korsgaard]

>>>>> "Steve" == Steve Calfee <nospamcalfee@yahoo.com> writes:

 Steve> Hi,

 Steve> I have just spent some time trying to enable NFS on a beagle
 Steve> board. It seems that RPC is required for nfs.

You have to make the distinction between boot-from-nfs and being able to
mount nfs shares at runtime. For both you need kernel support for NFS,
but:

1: boot-from-nfs needs CONFIG_ROOT_NFS and CONFIG_IP_PNP (and
   IP_PNP_DHCP for most setups) enabled in the kernel and no changes in
   userland.

2: runtime nfs support needs RPC support in C library and NFS support in
   busybox mount command (automatically enabled if you used the standard
   busybox config).

The bootloader doesn't need any changes for either of these (with the
possible exception of a modification of the kernel cmdline).

This is not really related to buildroot though (except for the automatic
enabling of NFS support in busybox mount if the C library has RPC
support).

-- 
Bye, Peter Korsgaard