I have the PBP and the serial cable sold in the store. The serial console developer guide referenced in the store gives instructions for use with the original Pinebook, which uses a different SoC.
The file /sys/class/sunxi_dump/write is not present on the PBP rk3399 based system.
So it is not yet clear how to use the serial cable with the PBP.
UPDATE
The wiki defines how the serial cable is to be used. The bottom of the PBP must be removed, and a switch must be toggled. See the wiki for further guidance.
The file /sys/class/sunxi_dump/write is not present on the PBP rk3399 based system.
So it is not yet clear how to use the serial cable with the PBP.
UPDATE
The wiki defines how the serial cable is to be used. The bottom of the PBP must be removed, and a switch must be toggled. See the wiki for further guidance.