CI20 upstream

Revision as of 07:01, 16 December 2014 by Hogan (talk | contribs) (Core: gpio and pinctrl paths and comments)
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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

Status of Linux Kernel Drivers


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(?)
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/ (?)
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
Audio (ALSA) WIP Check patches on!forum/mips-creator-ci20-dev
Ethernet Works
HDMI WIP Check patches on!forum/mips-creator-ci20-dev
I2C Works
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
Wifi WIP Check patches on!forum/mips-creator-ci20-dev
BT WIP Check branches on

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.