I made & uploaded first CM7 images for RK2918 tablets.
I have only Yuandao(Window) N50DT. I think it will work on other tablets, but it may need some modification for them. this is first one, don't expect so many. I need your info to support more tablets.
please download boot.img(ramdisk) and system.img(in zip). you need at least 144MiB system partition. you can flash these images with RKAndroidTool or rkflash/rkflashtool, or you can use these images to make custom upate.img based on your stock update.img. (replace only boot.img and system.img. do not use update.img for other tablets, otherwise your tablet will be bricked)
if you are using SDK2.0 based ROM, your stock boot.img may include kernel and you may not have separated kernel.img. then, you need to split boot.img into kernel and ramdisk, and you need to make kernel.img from it.
$ unpackbootimg -i boot.img
$ rkcrc -k boot.img-zImage kernel.img
don't forget to add/flash kernel.img into your update.img/ROM. flashed kernel.img will be used if boot.img/recovery.img is pre-SDK2.0 format, i.e. it has only ramdisk and no kernel.
new format used in SDK2.0 based ROM is almost same as common format for android. in general, mkbootimg can generate it. but Rockchip changed something. I can't regenerate same SHA1 hash value in header of boot.img(offset 0x240 bytes). it may use another value to generate hash, or it may not be SHA1.
anyway, we can split kernel and ramdisk from SDK2.0 boot.img, we can make pre-SDK2.0 kernel.img and boot.img(ramdisk) from it, so it should not be a problem.
if you want to build CM7 yourself, please use following repo as a base.
following utilities for RK28/29 may help you.
this is my free time project. I can do something only if I have enough time, and generally I have no time at all. if you want something, you can use my files freely. I may not be able to answer your question/request so many.
what works: 3D, accelerometer, audio, gapps, internal NAND flash, SD card, touchscreen, USB host/device, wlan
Adobe Flash11 works fine.
new images are uploaded. no workaround is needed for 3D.
my web page/thread on XDA forum are prepared for my CM7 for RK2918. please use my page/thread for my CM7.
of course you can start your own thread, you can make your own custom rom based from my images, and you can build your own CM7 freely!