[yocto] Failed to boot Non-SDK Image inside Eclipse

[skorpyon1992]

        Hello everyone,

    I have a problem related to booting the qemuarm image inside eclipse 
in order to test some applications I develop.
I built a custom image (it inherits core-image-minimal, used latest 
linux kernel 4.8, adds a few extra packages, such as boost, libstd, 
libmodbus etc.) which runs succesfully inside yocto with runqemu command 
(as ext4 fstype, also I have an extra ext4 partition made which is added 
with -drive parameter to runqemu command).
In order to use the created image inside Eclipse, I have extracted the 
rootfs separately and used the folowing trick to compile succesfully the 
application I am working at 
(https://wiki.yoctoproject.org/wiki/TipsAndTricks/RunningEclipseAgainstBuiltImage#Why_SDK_Image). 
I am using Eclipse Luna.
I have set all the necessary parameters inside, qemu starts, but at boot 
it hangs  at the following lines:
/
//md: Waiting for all devices to be available before autodetect//
//md: If you don't use raid, use raid=noautodetect//
//md: Scanned 0 and added 0 devices.//
//md: autorun..//
//md: autorun DONE.//
//
//After a while it shows the following://
//
//VFS: Unable to mount root fs via NFS, trying floppy.//
//VFS: Cannot open root device "nfs" or unknown-block(2,0): error -6//
//Please append a correct "root=" boot option; here are the available 
partitions://
//0100     4096  ram0 (driver?) //
//......//
//fd00    4096  vda    driver:virtio_blk//
//Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(2,0)//
//....//
/
   Inside the console terminal (the one that starts the qemu console) it 
shows the following:

/
//Assuming /home/user/myrootfs-rootfs/rootfs is an nfs rootfs//
//
//Continuing with the following parameters://
//KERNEL: 
[/home/user/test/yocto-krogoth/build-qemuarm/tmp/deploy/images/qemuarm/zImage-qemuarm.bin]//
//ROOTFS: [/home/user/myrootfs-rootfs/rootfs]//
//FSTYPE: [nfs]//
//Acquiring lockfile for tap0...//
//Acquiring lockfile for tap1...//
//Acquiring lockfile for tap2...//
//Acquiring lockfile for tap4...//
//Acquiring lockfile for tap3...//
//Acquiring lockfile for tap5...//
//Using preconfigured tap device 'tap5'//
//If this is not intended, touch /tmp/qemu-tap-locks/tap5.skip to make 
runqemu skip tap5.//
//runqemu-export-rootfs restart /home/user/myrootfs-rootfs/rootfs//
//No PID file, not stopping rpc.nfsd//
//Creating exports file...//
//Starting User Mode nfsd//
//
// /home/user/test/yocto-krogoth/build-qemuarm/tmp/sysroots/x86_64-linux/usr/bin/pseudo 
-P 
/home/user/test/yocto-krogoth/build-qemuarm/tmp/sysroots/x86_64-linux/usr /home/user/test/yocto-krogoth/build-qemuarm/tmp/sysroots/x86_64-linux/usr/bin/unfsd 
-p -N -i /home/user/.runqemu-sdk/nfs5.pid -e 
/home/user/.runqemu-sdk/exports5 -x 11116 -n 3059 -y 21116 -m 3058//
////
//On your target please remember to add the following options for NFS//
//nfsroot=IP_ADDRESS:/home/user/myrootfs-rootfs/rootfs,nfsvers=3,port=,mountprog=,nfsprog=,udp,mountport=//
//Running qemu-system-arm...//
///home/user/test/yocto-krogoth/build-qemuarm/tmp/sysroots/x86_64-linux/usr/bin/qemu-system-arm 
-kernel 
/home/user/test/yocto-krogoth/build-qemuarm/tmp/deploy/images/qemuarm/zImage-qemuarm.bin 
-net nic,model=virtio -net 
tap,vlan=0,ifname=tap5,script=no,downscript=no -M versatilepb 
--no-reboot -show-cursor -usb -usbdevice tablet -no-reboot -dtb 
/home/user/test/yocto-krogoth/build-qemuarm/tmp/deploy/images/qemuarm/zImage-versatile-pb.dtb 
-drive 
file=/home/user/test/yocto-krogoth/build-qemuarm/tmp/deploy/images/qemuarm/data.ext4,if=virtio,format=raw 
-m 128 -serial mon:vc -serial null -append "root=/dev/nfs 
nfsroot=192.168.7.1:/home/user/myrootfs-rootfs/rootfs,nfsvers=3,port=3059,mountprog=21116,nfsprog=11116,udp,mountport=3058 
rw console=ttyAMA0,115200 ip=192.168.7.12::192.168.7.11:255.255.255.0 
mem=128M console=tty"//
//vpb_sic_write: Bad register offset 0x2c//
//
/

      I have rpcbind enabled (it has been addded the -i option as 
described in the documentation). Inside the kernel's defconfig the NFS 
support is enabled.
      unfsd it listens on port 3049 (checked with netstat).
      Inside syslog I have a warning related to it:
/        Nov 18 13:37:04 unknown unfsd[27672]: Warning: unknown exports 
option `async' ignored/

     What should be done in order to succesfully boot the non SDK image 
inside Eclipse with the NFS file system?

      Thanks in advance!
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