uhm, I assume you do have u-boot combined with stock kernel. If you'd use kernel power you shouldn't get -110 errors while trying to load a kernel from sd. Explanation: some sdcards need the dto=14 patch enabled in kernel. stock kernel doesn't have it. so if stock kernel u-boot combi access sdcard you get -110 error. kernel-power, as far as I know, does have that patch enabled.