devkit8000,android,NFS boot

NFS boot

• Follow the steps to boot the board using NFS
  

1. Setup host machine as NFS server (optional)
   
   • If you want to setup a new NFS server, do this step
     
     

     $ sudo apt-get install nfs-kernel-server portmap
     $ sudo mkdir /nfsroot
     $ sudo vim /etc/exports
     

   • Add one line in /etc/exports:
     

     /nfsroot  *(rw,no_root_squash,sync)
     

   • Then restart NFS server
     $ sudo /etc/init.d/nfs-kernel-server restart
     
2. Build Kernel for NFS boot
   

   $make ARCH=arm devkit8000_defconfig
   $make ARCH=arm CROSS_COMPILE=../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- menuconfig
   

   • make sure your kernel enable these options for NFS boot:
     

     [*] Networking support  --->
           Networking options  --->
           [*]   IP: kernel level autoconfiguration
           [*]   IP: DHCP support
       
           File systems  --->
           [*] Network File Systems  --->
              <*>   NFS client support
                 [*]     NFS client support for NFS version 3
                 [*]     NFS client support for the NFSv3 ACL protocol extension
                 [*]     NFS client support for NFS version 4 (EXPERIMENTAL)
                 [*]     Root file system on NFS
     

   • Build kernel:
     

     $make ARCH=arm CROSS_COMPILE=../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- uImage
     

3. Copy kernel to the TFTP server's root
   
   • We also have a TFTP server on the test machine, the TFTP server's root path is: /mydroid/tftpboot
     
   • Put kernel file to the TFTP server's root path
     
   • uImage is the name of the kernel file you just built out
     

     $cp uImage /mydroid/tftpboot/
     
     

4. Prepare the rootfs
   
   • Put the files to the NFS root path
     
   • Use android for example, we build the file system first, then do the commands:
     

     $cp -rf $OUTPUTDIR/root/* /mydroid/myfs/
     $cp -rf $OUTPUTDIR/system /mydroid/myfs/
     

5. Set the boot parameters to kernel for the frist time, before it run 'autoboot'
   
   • serverip is the IP address of your NFS server
     
   • for example, our NFS server ip here is 10.126.34.43
     

     OMAP3 DevKit8000 # run eraseenv
     OMAP3 DevKit8000 # edit netboot
     edit: echo Booting from network ...; setenv bootfile uImage; setenv serverip 10.126.34.43; dhcp ${loadaddr}; run netargs; bootm ${loadaddr}
       
     OMAP3 DevKit8000 # edit netargs
     edit: run commonargs; setenv bootargs ${bootargs} root=/dev/nfs rw ipaddr=dhcp nfsroot=10.126.34.43:/mydroid/myfs,nolock mem=256M noinitrd androidboot.console=ttyS2 ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:devkit8000:eth0:off ${kernelopts}
       
     OMAP3 DevKit8000 # edit autoboot
     edit: run netboot
       
     OMAP3 DevKit8000 # saveenv
     

6. Boot
   
   • Just restart the board
     
   • The same as normal boot, Enjoy!