MIPS Creator CI20

The following list indicates the state of peripheral support in NuttX:

Peripheral	Support	NOTES
CPU0	Yes	1.2GHz MIPS32 processor
CPU1	No	1.2GHz MIPS32 processor
RAM	Yes	256MiB
ADC	No
Audio	No
Display	Yes	HDMI (EDID not yet supported)
DMA	No
Ethernet	Yes	Fast Ethernet (DM9000)
GPIO	Yes
I2C	No
LED	No
TRNG	Yes
SDcard	No
SPI	No
Timers	Yes
UART0	Yes	Initialized by U-Boot
USB OTG	No	DWC2
USB Host	Yes	EHCI + OHCI
Watchdog	Yes

Configurations

Important

U-Boot must be properly configured for networking (e.g., valid ipaddr, serverip, and ethaddr environment variables) to fetch the image over TFTP.

NuttX is loaded via U-Boot using TFTP (replace <tftp_dir> with your local TFTP root directory).

You can use the following command to configure the NuttX build:

./tools/configure.sh -l ci20/nsh

 make CROSSDEV=mips-mti-elf-
 cp uImage <tftp_dir>/nuttx.umg

Run this from U-Boot prompt:

tftp nuttx.umg && bootm $fileaddr

nsh

Basic serial console access to the NSH shell.

Note

Connect USB cable from your PC to UART0 pins on the Raspberry PI connector.

Then use some serial console client (minicom, picocom, teraterm, etc) configured to 115200 8n1 without software or hardware flow control.

net

Basic serial console access to the NSH shell.
Networking support through the RJ45 connector.

The telnet daemon is included, so the CI20 board can be connected to through telnet.

jumbo

Basic serial console access to the NSH shell.
Networking support through the RJ45 connector.
USB host support: mass storage, hub, keyboard and mouse.
Builtin Apps: dd, hidkbd, ping, tc, fb, nsh, sh, telnetd