crypto accelerator card for Thecus N2100 and dm

I want to get me a crypto accelerator card -- the soekris vpn1411 [1] -- card for my arm-based thecus n2100, running debian. There is a driver for the chip -- a hifn 7955 -- in the kernel-sources. The goal I want to achieve is to increase throughput for the dm-(luks) encrypted storage. So the

what creates /etc/kernel-img.conf?

Cause I'd like to file a bug against it, and dpkg -S seems to be stumped. Basically, I think flashing kernels should be /off/ by default, given there's no failback at the moment and so it really requires manual testing of new kernels via tftp boot to avoid any nasty surprises.. regards, --