Ox64

Summary

This is a simple development board from Pine64:

  • 26 GPIO pins

  • on-board NOR flash (16Mb or 128Mb)

  • microSD

  • JTAG Header

More information on this board can be found here.

Pinout Notes

The pinout in the schematic is not correct. Instead it is:

GPIO

Function

6

M0_JTAG_TMS

7

M0_JTAG_TDO

12

M0_JTAG_TCLK

13

M0_JTAG_TDI

https://github.com/bouffalolab/bl_mcu_sdk/issues/32#issuecomment-1296513790

Flash Notes

The development board that I was given did not have the 128Mb flash (16Mb) so I was not able to load many of the sample images including attempting to load Linux as shown in the quick start.

Loading you will get an error that looks like this .. code-block:

{"ErrorCode": "003E","ErrorMsg":"BFLB FLASH LOAD VERIFY FAIL"}

Programming Notes

This board does not have a onboard USB-UART adapter. Some adapters struggle to use the 2M baud programming speed and will only work at lower baud rates such as 115200. The Tigard adapter seemed to be fairly reliable.

Debugging with JTAG

When the device is placed in the bootloader mode, you are able to connect via JTAG. I was not able to get openocd to find the cores, but using cklink as documented in Using JTAG I was able to debug the M0 core.