Hi!
I'm newbe at this forum, but not at programming for ARM, arm asm and Ida
Some time ago I bought rk2705-based player (ritmix rf-8900). That player has 320x240 Mcu16 Lcd, touchscreen, radio and G-sensor.
I've read all topic and download SDK. I've read that people with touchscreen players can't run SDK'S firmware. But all you need is disassemble original firmware and find function HWTouchGetPixelPoint. I write my own function based on disasm and now touchpad works for me! Also I write display init function and keyboard handler (he-he, "keyboard" sounds very loud, it's only one poweroff key
) But interface isn't adapted for touchpad, so I append some code to RockChipEmu to emulate touchpad on PC. Now, if somebody wants, I can upload modified source and emulator at Saturday or Sunday, and if you has player with touchpad, you can try it and help to adapt interface.
I agree that .rkp is dying, so I port so-called "elfloader". This is function that load *.elf file from disk to ram and give control to it's main() function. At this time I trying to make swi-handler, sdk's firmware doesn't have one.