[Arm-netbook] Booting A10 Tablet from sdcard

[Frank]

Hi,

I have a cheap A10 tablet that I am trying to boot from the
micro-sdcard slot. It came with Android ICS and from what I can tell, is
using boot.axf to chainload u-boot

I followed the directions here
http://rhombus-tech.net/allwinner_a10/a10_mmc_boot/ to build a bootable
micro-sdcard. I copied script.bin from my working android installation
to the boot partition.

When I try to boot the tablet with the micro-sdcard inserted I get no
action from the LCD. Basically it stays blank the entire time but if I
put the tablet up to my ear, I can hear it running. If I shut it off and
then take the sdcard out, it will boot android no problem. From what I
can tell, its hanging somewhere in the bootloader and the kernel never
actually gets executed. I've tried a few different images and all have
behaved the same way.

Is there anything I am missing that could prevent the tablet from
booting from mmc? Could it be possible that the manufacturer modified
boot.axf to lock the boot cycle? Or could it be a bad setting in
script.bin? Will u-boot turn on the lcd when booting or will that only
happen when the kernel loads? 

Any tips for getting this thing to boot from mmc? Its an irulu brand
tablet, with a crane board and the device description in android
says 'SoftwinerEvb'