Frequently Asked Questions (FAQ)#
How to Force LCD or HDMI Display?#
Force LCD Display:
# Using the 01studio development board as an example
cd /boot
echo "k230-canmv-01studio-lcd.dtb" > force_dtb
sync
reboot
Force HDMI Display:
# Using the 01studio development board as an example
cd /boot
echo "k230-canmv-01studio.dtb" > force_dtb
sync
reboot
View the Current Display Configuration:
# Use fw_printenv to check whether the dtb environment variable contains the keyword lcd
[root@canaan ~ ]# fw_printenv dtb
dtb=k230-canmv-01studio.dtb
[root@canaan ~ ]#
# Decision rules:
# - Contains "lcd" → Currently using LCD display
# - Does not contain "lcd" → Currently using HDMI display
How to Connect to WiFi?#
Method 1: Configure via environment variables (automatically connect after reboot)
fw_setenv wlanssid H3C_wjx
fw_setenv wlanpass 12345678
reboot
Method 2: Use the sta.sh script (connect immediately without rebooting)
sta.sh wlan0 H3C_wjx 12345678
How to Read the Chip Unique Identifier?#
The PUF module of K230/K230D provides a chip unique identifier (32 bytes). In the Linux user space, it can be read using the following command:
devmem 0x91213300 32
devmem 0x91213304 32
devmem 0x91213308 32
devmem 0x9121330c 32
devmem 0x91213310 32
devmem 0x91213314 32
devmem 0x91213318 32
devmem 0x9121331c 32
How to Switch Camera Channels (CSI0/CSI1/CSI2)?#
The K230 Linux SDK currently supports single-camera mode only. To switch between different camera channels, please refer to:
How to Enable the GDB Debugger?#
Enable via MenuConfig:
make menuconfig
# Path: Target packages → Debugging, profiling and benchmark → gdb → full debugger
Or directly modify the configuration file:
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
How to Quickly Update the Kernel and Device Tree?#
Directly replace the relevant files in the /boot directory:
ls -lh /boot/
# Output description:
# Image # Kernel image
# fw_jump_add_uboot_head.bin # U-Boot boot image
# k.dtb # Device tree symbolic link
# k230-canmv-*.dtb # Specific device tree files
# nuttx-*.bin # NuttX firmware
How to Verify DDR Memory Stability?#
Run the following commands to generate DDR test images:
make ddr_test_img_128 # 128MB DDR test image
make ddr_test_img_512 # 512MB DDR test image
make ddr_test_img_1024 # 1024MB DDR test image
make ddr_test_img_2048 # 2048MB DDR test image
The generated images will automatically run the DDR stability test program (running continuously). During the test, serial port 0 will continuously output relevant information; if the test fails, serial port 0 will print error messages.
What Hardware Does the SDK Currently Support?#
Development Board |
CPU |
Configuration File |
Notes |
|---|---|---|---|
Banana Pi |
k230d |
BPI-CanMV-K230D-Zero_defconfig |
64-bit |
Banana Pi |
k230d |
BPI-CanMV-K230D-Zero_ilp32_defconfig |
32-bit |
k230d_canmv |
k230d |
k230d_canmv_defconfig |
64-bit |
01studio |
k230 |
k230_canmv_01studio_defconfig |
|
Dongshan Pi |
k230 |
k230_canmv_dongshanpi_defconfig |
|
JLCPCB |
k230 |
k230_canmv_lckfb_defconfig |
|
ChuangLebo |
k230 |
k230_canmv_v3_defconfig |
|
canmv1.0/1.1 |
k230 |
k230_canmv_defconfig |
|
evb |
k230 |
k230_evb_defconfig |
lpddr3 |
What LCD Screens Does the Linux SDK Support?#
Driver Chip |
Resolution |
Applicable Development Boards |
|---|---|---|
ST7701 |
480×640 |
01studio |
ST7701 |
480×800 |
JLCPCB / 01studio / ChuangLebo |
ILI9806 |
480×800 |
Dongshan Pi |
HX8399 |
1080×1920 |
EVB |
What Camera Modules Does the K230 Linux SDK Support?#
Model |
Pixels |
Notes |
|---|---|---|
GC2093 |
2MP |
|
OV5647 |
5MP |
|
IMX335 |
5MP |