Port Status

driver	status	comments
LCD	90%	Only one type of lcd implemented. No inverse and other fancy stuff.
Backlight	100%	PWM frequency is quite low ~500Hz but my backlight driver circuit can't cope with higher freq reliably.
Buttons	100%	Hardware keys for generic/reference design.
I2C?	100%	One can write and readback registers of the internal codec.
SD	90%	Basicaly works. DMA handling is suboptimal. Needs more testing.
NAND	10%	Low level driver part is reverse engineered. The work on reverse engineer FTL scheme is started.
PCM	80%	PCM driver implemented but playback is choppy on some players.
Codec	80%	Driver for internal Dolphin codec implemented but not much tested. No support for anything else than playback through i2s yet.
Recording	0%	Not implemented.
ADC	50%	Implemented but not tested nor calibrated.
RTC	0%	Not present in my device. From various documents it seems that HYM8563 (PCF8563 clone) is widely used. Some members of the rk27xx family have internal RTC.
FM	50%	RDA5807P? can work in TEA5767 compatibility mode. Rockbox has mature driver for that.
USB	5%	The USB core has some weird scheme of supporting control packets. Some requests seems to be handled purely in hardware which doesn't quite fit rockbox usbstack concept.

Running custom code

One may compile rockbox bootloader (which currently is playground for testing code) and execute this on the device with help of rk27load utility (located in utils/rk27tools/rk27load)

As of r30459 it is possible to compile and run main rockbox binary, codecs and a few test plugins.

-- MarcinBukat - 07 Jun 2011