Buildroot CoM260 Kit Test Report

Test Environment

System Information

• System Version: SpacemiT Buildroot K3 v1.0.7
• Download Link: Here
• Reference Installation Documentation: Here

Hardware Information

• CoM260 Kit, 16GB RAM / 128GB Storage
• DC Input (chassis rating): 19V / 2.37A or 12V / 5A
• USB Type-C Data Cable
• USB-to-TTL Serial Adapter and Jumper Wires
• 1 female-to-female jumper wire (for entering flashing mode)
• Network and Ethernet Cable

Installation Steps

The following steps use TITANTOOLS on Ubuntu (x86_64) to flash the image over USB.

Download the Flashing Tool

Download TITANTOOLS FOR LINUX X64 (64-BIT) (APPIMAGE) as described in the Flashing Tool User Manual. In the download directory, make it executable and launch it:

chmod +x titantools_for_linux-2.2.0-Rc.AppImage
./titantools_for_linux-2.2.0-Rc.AppImage

Enter Flashing Mode

Prepare 1 female-to-female jumper wire. Orient the board as shown below, with the USB and Ethernet ports at the bottom and the button header at the top. Count positions from the left end of the header toward the right in this orientation.

Positions counted from the left	Signals to short	Purpose
3rd and 4th pins	FC_REC ↔ GND	Select flashing mode

To short a pair of pins, connect one end of the same female-to-female jumper wire to each pin.

• Device not powered, with the board turned off:

  1. Disconnect DC power from CoM260.
  2. Disconnect the Type-C cable as well.
  3. Connect one end of the jumper wire to the 3rd pin, FC_REC, and the other end to the 4th pin, GND. Keep it connected.
  4. Connect DC power to power on CoM260.
  5. Wait 1–2 seconds.
  6. Remove the jumper wire from the header to release the short between the 3rd and 4th pins.
  7. Connect CoM260 to the Ubuntu host using a Type-C cable that supports data transfer.

Flash the Image

1. Download the image above. In TITANTOOLS, select the single-device flashing option under the development tools.

2. Scan for devices and select the device corresponding to CoM260.

3. Select a local file, load Buildroot-K3-v1.0.7-20260819142006.zip, and wait for extraction to complete.

   

4. Start flashing. Wait for completion, then power-cycle the board.

   

Logging into the System

Orient the board as shown in the pin diagram above, with the USB and Ethernet ports at the bottom and the header at the top. Count positions from the left end of the header toward the right, and connect the USB-to-TTL adapter using 3 jumper wires:

Position counted from the left	CoM260 signal	USB-to-TTL adapter
6th	GND	GND
9th	UART_TXD	RXD
10th	UART_RXD	TXD

Confirm that the UART signal voltage levels match before connecting. With the board powered off, connect the wires according to the adapter’s pin labels. Leave the adapter’s VCC disconnected, power the board through DC, and connect the adapter’s USB end to the Mac or Linux host.

Mac host:

After installing Homebrew, install tio with:

brew install tio

Find serial devices in the Mac terminal:

find /dev -maxdepth 1 -name 'cu.*'

If multiple devices appear, compare the output before and after plugging in the USB-to-TTL adapter to identify the new device. The following command uses /dev/cu.usbserial-1140 as an example serial device name; replace it with the device name found on your system:

tio -b 115200 /dev/cu.usbserial-1140

Linux host:

Install tio on Ubuntu / Debian:

sudo apt update
sudo apt install tio

For other Linux distributions, install tio using the appropriate package manager.

Find serial devices in the Linux terminal:

find /dev -maxdepth 1 \( -name 'ttyUSB*' -o -name 'ttyACM*' \)

If multiple devices appear, compare the output before and after plugging in the USB-to-TTL adapter to identify the new device. The following command uses /dev/ttyUSB0 as an example serial device name; replace it with the device name found on your system:

sudo tio -b 115200 /dev/ttyUSB0

tio defaults to 8N1 with flow control disabled.

After connecting the serial terminal, power on the board once flashing is complete, monitor the boot output, and log in.

Default username: root

Default password: bianbu

Common Issues

The Type-C port handles data transfer and flashing, but does not power the board. Connect the power supply through DCIN.

Expected Results

The system boots up successfully and allows login through the serial port.

Actual Results

The system boots up successfully and allows login through the serial port.

Boot Log

Version note: The image filename indicates v1.0.7, while VERSION in /etc/os-release on the board reports k3-br-v1.0.6.

Screen recording (from power-on to serial login and system information checks):

# uname -a
Linux K3-Buildroot 6.18.3 #1 SMP PREEMPT_DYNAMIC Wed Aug 19 06:28:14 UTC 2026 riscv64 GNU/Linux
# cat /etc/os-release
NAME=Buildroot
VERSION=k3-br-v1.0.6
ID=buildroot
VERSION_ID=2025.02.6
PRETTY_NAME="Buildroot 2025.02.6"
# cat /proc/cpuinfo
processor	: 0
hart		: 0
model name	: Spacemit(R) X100
isa		: rv64imafdcvh_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintntl_zihintpause_zihpm_zimop_zaamo_zalrsc_zawrs_zfa_zfbfmin_zfh_zfhmin_zca_zcb_zcd_zcmop_zba_zbb_zbc_zbs_zkt_zvbb_zvbc_zve32f_zve32x_zve64d_zve64f_zve64x_zvfbfmin_zvfbfwma_zvfh_zvfhmin_zvkb_zvkg_zvkned_zvknha_zvknhb_zvksed_zvksh_zvkt_smaia_smstateen_ssaia_sscofpmf_ssnpm_sstc_svade_svinval_svnapot_svpbmt_sdtrig
mmu		: sv39
uarch		: spacemit,x100
mvendorid	: 0x710
marchid		: 0x8000000058000002
mimpid		: 0x33d8a600
hart isa	: rv64imafdcvh_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintntl_zihintpause_zihpm_zimop_zaamo_zalrsc_zawrs_zfa_zfbfmin_zfh_zfhmin_zca_zcb_zcd_zcmop_zba_zbb_zbc_zbs_zkt_zvbb_zvbc_zve32f_zve32x_zve64d_zve64f_zve64x_zvfbfmin_zvfbfwma_zvfh_zvfhmin_zvkb_zvkg_zvkned_zvknha_zvknhb_zvksed_zvksh_zvkt_smaia_smstateen_ssaia_sscofpmf_ssnpm_sstc_svade_svinval_svnapot_svpbmt_sdtrig

Desktop screenshot:

If the Weston desktop does not start automatically, run the following command in the board’s serial terminal:

/etc/init.d/S30weston-setup.sh start

Test Criteria

Successful: The actual result matches the expected result.

Failed: The actual result does not match the expected result.

Test Conclusion

Test successful.