I have two Bubblegum-96 at hand, both of their seial console did't work! I checked the latest schematic v1.0 at this link:https://raw.githubusercontent.com/96boards/documentation/master/bubblegum-96/Schematics_Bubblegum96.pdf, it has a circut at page 17 that the 1.8V GPIOD1/UART2_TX and GPIOD0/UART2_RX convert to 3.0V debug port, that's TP6~TP12 on bottom side of the board. But nothing can i see from this port! I don't know what's wrong with it! I searched on Baidu, Google, nothing about this issue! It seems that few people use this board currently. And I found a file in the SDK, S900_sdk/owl/s900/boards/android/s900_96board/bootloader.ini, in this file, I found a section defined the serial port:
;uart_pad:which pin the uart_id used
;uart_baudrate:the serial's baudrate
In this section "uart_pad" is totally confused me! The comment is so LOW, you know, I can't catch what the hell is "which pin the uart_id used", if it point to the PIN of S900, then uart_pad equals an interger, are you kidding me!
Then I search all the documents in the SDK, nothing more about this god damn uart_pad!
So, please help me!
I want to change the uart_id TO UART2, BUT i don't know how to define the god damn uart_pad! The guy who give this comment should be fired! Even i found a table , but i can't stll determine the value of uart_pad!