CI20 upstream
This page contains details about the latest kernel branch and any known quirks/special requirements.
It will be periodically updated to keep up to speed with the latest.
The current branch tracking mainline 3.16
https://github.com/MIPS/CI20_linux
Status of Linux Kernel Drivers
Core
| Name | State | Path | Notes |
|---|---|---|---|
| IRQ Controller | drivers/irqchip/irq-jz4780.c | Very similar between SoCs (4740 has one bank, 60,70,80 has two banks) | |
| Clocks | Works | drivers/clk/jz47xx | Could have common drivers/clk/ingenic for all SoCs with SoC specific binding using common components(?) |
| CPUfreq | |||
| Device Tree | Mostly | Parsed on boot, but compiled into the kernel. Would be good to allow it to be passed from the bootloader. | |
| DMA | Mostly | drivers/dma/dma-jz4780.c | needs combining into dma-jz4740. Works, just missing priority support |
| GPIO | Works | drivers/pinctrl/pinctrl-jz4780.c | should perhaps be in drivers/gpio/ (?) |
| Hotplug | |||
| MXU Context | |||
| PinCtrl | Mostly | drivers/pinctrl/pinctrl-jz4780.c | Differs between SoCs. Functional, may need DT binding changes based on feedback from upstream. See also pinctrl-jz4770.c. |
| Power Controller (LPCR Register) | |||
| Power Off & Reset | Works | ||
| RTC | Works | ||
| SMP | Works | ||
| Watchdog | Works |
Peripheral drivers
| Name | State | Notes |
|---|---|---|
| ADC | WIP | Check branches on https://github.com/ZubairLK/CI20_linux |
| Audio (ALSA) | WIP | Check patches on https://groups.google.com/forum/#!forum/mips-creator-ci20-dev |
| Camera | ||
| Ethernet | Works | |
| GPU | ||
| HDMI | WIP | Check patches on https://groups.google.com/forum/#!forum/mips-creator-ci20-dev |
| I2C | Works | |
| IPU | ||
| IR | ||
| MMC | Works | |
| NAND | Works | |
| Regulator | Works | |
| SPI | SPIO GPIO should work.. | |
| UART | Works | |
| USB (EHCI) | Works | |
| USB (OHCI) | Works | |
| USB(OTG) | Works | Upstream driver supports only host mode as of 3.15 |
| VPU | ||
| Wifi | WIP | Check patches on https://groups.google.com/forum/#!forum/mips-creator-ci20-dev |
| BT | WIP | Check branches on https://github.com/ZubairLK/CI20_linux |
List of other possible issues
- /etc/init.d/iw8103 is the startup script for the BT/Wifi firmware in the default rootfs.
If using 3.16, the script can cause the boot to hang. Please move the script out of /etc/init.d
Add "root=/dev/mmcblk0p1 rootwait" to bootargs in uboot if you wish to boot a rootfs from mmc.
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