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 | Notes |
|---|---|---|
| Clocks | Works | |
| 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 | Works, just missing priority support |
| GPIO | Works | |
| Hotplug | ||
| MXU Context | ||
| PinCtrl | Mostly | Functional, may need DT binding changes based on feedback from upstream |
| Power Controller (LPCR Register) | ||
| Power Off & Reset | Works | |
| RTC | Works | |
| SMP | ||
| Watchdog | Works |
Peripheral drivers
| Name | State | Notes |
|---|---|---|
| ADC | ||
| 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 | ||
| 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 |
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
- bootargs are not passed from u-boot but via DT as of commit 91af30879aae68a8b2f22f54651a85057d3b6457 Add DT nodes for regulator.
Add "root=/dev/mmcblk0p1 rootwait" to bootargs in ci20.dts if you wish to boot a rootfs from mmc until this is patched.
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