[yocto] unbootable image produced with PACKAGE_CLASSES ?= "package_ipk", /etc missing

[Todd Stellanova]

Hello,

I'm following these directions for building with yocto for the wandboard:
http://wiki.wandboard.org/index.php/Getting_started_with_Yocto_on_Wandboard

I'm building a bb recipe based on core-image-minimal-dev, to which I've
added:
IMAGE_FEATURES += "package-management"

In my conf/local.conf I originally had:
PACKAGE_CLASSES ?= "package_rpm"

This built fine and I was able to boot with the resulting sdcard image fine
on the wandboard. However, I'd like to use opkg on the wandboard for
package management, so I modified local.conf to:
PACKAGE_CLASSES ?= "package_ipk"

and bitbaked my image again.  The resulting sdcard image doesn't boot on
the wandboard, and if I look at the sdcard image I can see that, for
example, /etc is completely missing from the rootfs.

Do I need to do anything else to switch the build to properly using ipks
with opkg?

Thanks for any help!
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