Look within the /usr/dev directory within rootfs.img. Because the root filesystem is read-only, the device has to put modifiable files in /var, and stuff like /var/dev is copied there from other read-only places during the installation. It's a bit convoluted, but makes sense after a while.
As far as your crashes go, you could probably install strace or even gdb from the Debian lenny armel distribution on your device and then use something like utelnetd to run your program on the device and watch what happens.
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