Hi!
I'm a new user of Rockchip players.
My one is Rizone hacked "32GB" (actually 4GB), and the chip is RK2705 (almost equal to RK2706).
It has 400x240 touchscreen, microsd slot and 4 buttons (+reset).
I've put my firmware here:
http://www.mediafire.com/chiprocker
What I've found by now:
1) The player supports SDHC class6 cards (mine is 8GB).
2) It's easy to compile the firmware using RK27SDK, but it doesn't work on player.
Haven't tested the emulator yet.
3) It's easy to use SDK to compile RKW file from original firmware folders you've dumped from your player.
This way the process of recovery with RK27DM becomes very easy.
4) Inside the player I've found a 24MHz quartz; however, there's a 12MHz value in SDK files. Maybe, it should be changed.
I'm rather experienced C/C++ coder and I'm interested in good firmware for the player too. Maybe I'll try porting roxkbox when we collect some more info.
Alemaxx, how do you work with firmwares in IDA?