How to chroot into busybox environment?

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http://unix.stackexchange.com – i have a filesystem build with buildroot, to compile code for a device using a old kernel and uClibc. Now i want to chroot into the fs. The problem is, i dont have /bin/bash, just /bin/busybox. How do i say chroot to use busybox ash instead? I already tried to create a link to busybox ash, but chroot still says failed to run command /bin/bash. no such file or directory. (HowTos)