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uebayasi/openwrt-x86_64-nfs-root.md

Last active September 29, 2020 03:46
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Mount root as NFS on OpenWrt x86_64
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openwrt-x86_64-nfs-root.md

Summary

  • Not much info available but surely possible
  • Basically same as normal Linux NFS root
  • Except kernel configuration adjustment might be tricky

Environment

  • Target: OpenWrt 15.x on KVM
  • Host Ubuntu 16.04

Configuration

Kernel

  • Do make kernel_menuconfig
  • Save changes with git diff target/linux
  • Add CONFIG_KERNEL_IP_PNP=y to the global .config (not one under linux subdirectory), do make defconfig, and make V=s
    • Enable CONFIG_DHCP and CONFIG_ROOT_NFS for kernel config

Host

  • Basic "Linux NFS root" configuration
  • Nothing special needed for OpenWrt
  • NFS root
    • Root is OpenWrt's build_dir/target-x86_64_musl-1.1.14/root-x86
      • XXX Need to fix file user/group/mode?
    • Edit etc/config/network and comment out config interface 'lan' (eth0)
      • eth0 is already configured for NFS root

References

  1. http://www.8devices.com/community/viewtopic.php?f=6&t=471
  2. https://github.com/MarvellEmbeddedProcessors/openwrt-bb/wiki/ClearFog-a1-Instructions
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