After devtool build image, files can be found in rootfs, but not found when I run on QEMU

Question

I used devtool build-image to include recipe in workspace.

I found corresponding files in rootfs, but couldn't find files when I use QEMU to mount image.

Here's what I done.

1. clone openBMC

2. build image for meta-evb-ast2500

   export TEMPLATECONF=meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf
   . openbmc-env
   

3. bitbake obmc-phosphor-image
4. successful
5. devtool add bbexample https://github.com/whbruce/bbexample.git
6. devtool build-image obmc-phosphor-image

7. files could be found in fs

   $ find tmp/work/evb_ast2500-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/ -name '*bbexample*'
   tmp/work/evb_ast2500-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/usr/bin/bbexample
   tmp/work/evb_ast2500-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/usr/lib/libbbexample.so.1
   tmp/work/evb_ast2500-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/usr/lib/libbbexample.so.1.0.0
   

8. start QEMU

   qemu-system-arm -m 256 -M ast2500-evb -nographic \
   -drive file=$(ls tmp/deploy/images/evb-ast2500/obmc-phosphor-image-evb-ast2500-*.static.mtd),format=raw,if=mtd \
   -net nic \
   -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443,hostname=qemu 
   

9. These files were not found

These files should have been included in image, right?

Something wrong?