Linux Driver Status
This page has the status for driver bringup for Vita Linux and is a good place to start with for people who want to contribute. The priority is determined as follows: high - required for a usable environment, med - required to be livable on it, low - not needed but would be nice to have, extra - not needed at all but bonus points for anyone who gets it working.
|GPIO||0%||Med||GPIO Registers||LEDs mostly|
|UART||50%||High||UART Registers UART Console||Console, debugging|
|DSI||0%||High||DSI Registers||Display interface|
|CSI||0%||Low||CSI Registers||Camera interface|
|I2C||0%||Med||I2C Registers||PMIC, camera, accelerometer, OLED brightness, clockgen, HDMI control|
|SPI||0%||Med||SPI Registers||Syscon, accelerometer, OLED, touch scree?, touchpad?|
|Motion||0%||Low||SPI, some ST chip|
|SDIO||0%||High||SceSdif ||eMMC, GC, Wifi/BT uses this. Standard SD interface.|
|MSIF||0%||Low||MSIF Registers SceMsif SceSblSsMgr||MemoryStick|
|WLAN/BT||0%||Med||Marvell 88W878S-BKB2, SDIO interface|
|eMMC||0%||High||SDIO interface, standard chip|
|Gamecard||0%||Med||Game Card||SDIO interface, extra auth (can be disabled and use sd2vita)|
|Memory Card||0%||Low||Memory Card||MSIF interface, extra auth|
|USB||0%||Med||EHCI||Ethernet, Audio codec, accessories|
|UDC||0%||Low||UDC SceUdcd||Connecting to host PC|
|PSP||0%||Extra||PSP Emulator||Custom MIPS|
|Codec||0%||Extra||Venezia||Toshiba MeP based|
Start with the low level interfaces (SPI, I2C, etc). Those are relatively simple. Some might even have standard controller interface (like SDIO). The hardest is probably USB (unless the interface is standard). Then you can implement the devices on top of the interfaces. A lot of the devices seem to use standard chips (WLAN, motion, touch, etc) so we may get them "for free".
For power management, we need sleep/resume first. Would be great is we can use the dynamic clocking features to save battery but that's low priority. Battery fuel gauge is through a standard chip over I2C interface.
Framebuffer might be the hardest. Seems to be a custom interface. If we can find any open source device that uses a similar controller, it would make things a lot easier.